 07 America jetting, SS Long Cannons, I'm confused
|
Joined: May 2008
Posts: 23
Complete Newb
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
I rejetted finally, after putting the SS Long Cannons on. Stock jets are 40 and 120 (yes, they are). SS sent 45 and 132. I did include my elevation when I ordered. I'm thinking both of these are too big. Am I wrong. And my mileage is now way down... I was going 250ish (km) between fill ups. Now it's around 180. Is Pats Jetting Calculator for the 865cc engine or the older 790cc? Does it matter? Should I order new jets? BTW, the pipes sound so awesome.
|
|
|
 Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
Quite a bit depends on the pipes themselves and what if anything you have done to the intake. No one can give you an educated answer without that info. The 45 is probably correct but along with that you need to adjust the mixture screws. the main requires more info. Are the pipes restricted? How restricted? Have you modified or removed the air box? What altitude will you be running the bike?
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
Sorry, I should have known better. Other than the Specialty Spare Long Cannons, as delivered, so I don't really know how restricted they are, but compared to the stock ones, I'll have to go with not much. There is a baffle in the pipes though. I also removed the AI system. The bike is all stock other than that. I have bought a K&N filter, but for now the stock one is still in. I put in the extended mixture screws, so I don't need to take out the carbs to adjust them. I started at 3 turns out and am now down to 1 and 3/4's. But seems to be still running rich. I'll take a look at the plugs tomorrow to be sure.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Very little usually changes in the idle circuit as a result of switching pipes. The carb itself is such a huge restriction at idle, opening the pipes has little effect. I would start the troubleshooting by reinstalling stock pilots.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
|
|
Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Can't really guess about this without knowing if you changed the input side of the equation as well. However, I have the same pipes (with K&N in a stock airbox) and I'm running 42 pilots with pretty good success and the 132 mains ought to be dead on for your mains. With the 45s installed you probably should turn your mix screws a good ways in (until you get an occasional decel pop) and see if that doesn't tweak your mileage back up. BTW I'm at 1000 ft (more or less).
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
Thanks for all the advice, I forgot, I'm roughly around 300 ft. I'm going to attempt turning the mixture screws in more as "oldroadie" suggests. I don't mean to appear stupid, but what do you mean by "changed the input side of the equation"?
Here's a rundown of what I did. Stock bike, removed AI, installed SS Long Cannons, changed jets from 40/120 to 45/132 (as provided by SS). Took out the "D" mix screws, put in the extended ones, also changed screws on carbs to the stainless ones. Air box unmodded with stock filter. I run 87 octane in her.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
|
|
Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Quote:
Air box unmodded with stock filter.
That's what I meant. The good pipes are only half of it, getting more air in is the other part...either with a K&N or UNI filter in the airbox and removing or modifying the "snorkle" to allow that puppy to breathe. I'd guess you're on the over-rich side of the fuel equation right now and that's where your good gas mileage went.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
I did buy a K&N filter. So the next project is to remove the snorkle then.
Thank you very much, all you guys are awesome
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Mar 2007
Posts: 5,616
Check Pants
|
|
Check Pants
Joined: Mar 2007
Posts: 5,616 |
Just for reference...I run 45/150s but I have no air box (FREAK).
Each side is different when it comes to turns out. I thnk one side is at 1+/_ turn adn the other is at 2+/- turns.
Ive never dynod it but judging by plug color Im running as good as I can.
Oh...Im at sea level.
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
|
|
Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
I'm running 42/135s with TORs and snorkels removed (there were 3 in my air box). My plugs are still white.
I think the 45 pilots you're running are too rich with the snorkels still in place. Remove them. Check your plugs before you do it. I'm guessing they will be dark. Point of clarification, are those km readings from full to reserve? Your gas mileage should get better when you give all that fuel more air.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Dec 2006
Posts: 2,150
Oil Expert
|
|
Oil Expert
Joined: Dec 2006
Posts: 2,150 |
I have Tors, K&N pod filters and I'm running 145 mains, 42 pilots, a shim on the stock needle and I'm still a tad rich, but I suspect it's because of the shim which I'll remove shortly to see how that goes.
My biggest success though was going with the 42 pilots cos now my bike idles really smoothly and has excellent responsivness compared to when I tried both the 40's and the 45's.
It's just a matter of tweaking this and that to get the best performance and milage for your own setup.
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
I think the 45 pilots you're running are too rich with the snorkels still in place. Remove them.
The idle circuit will be rich until he gets rid of those larger pilots. It doesn't matter whether there are snorkels. There isn't enough airflow through the carbs at idle for any of this to make a difference. The large pilots are sucking in additional fuel at idle, off-idle and lower midrange for no useful purpose.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Floats set too high can also induce a rich idle condition.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
Quote:
Very little usually changes in the idle circuit as a result of switching pipes. The carb itself is such a huge restriction at idle, opening the pipes has little effect. I would start the troubleshooting by reinstalling stock pilots.
Jack
This actually is not true since the pilot feeds fuel up into mid throttle combined with the main so the pilot does need attention with a pipe change. I feel 40 is going to be too small, especially as low as 300'. Either 42 or 45 and with all else being stock except the exhaust and the exhaust having at least some restriction then probably the 42 would be the one. If you find you need to turn the mixture screws out much more than 3 turns go to the next size up and readjust.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
This actually is not true since the pilot feeds fuel up into mid throttle combined with the main so the pilot does need attention with a pipe change.
Changing the main (and/or adding shims) is the correct way to reestablish the proper mid/full throttle mixture when changing exhaust. There's no reason to change the pilot. A larger pilot will over-rich the idle circuit.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
Quote:
Quote:
This actually is not true since the pilot feeds fuel up into mid throttle combined with the main so the pilot does need attention with a pipe change.
Changing the main (and/or adding shims) is the correct way to reestablish the proper mid/full throttle mixture when changing exhaust. There's no reason to change the pilot. A larger pilot will over-rich the idle circuit.
Jack
Not if the idle circuit is lean, by not changing the idle circuit with the main (this may be a screw adjustment this may be a jet change or both) you could end up lean at idle and part throttle then rich or good from mid throttle or so on. Especially given these engines are lean from the factory.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Especially given these engines are lean from the factory.
Yes, but they're not so lean that the pilot needs replacing. Anyway, my comments were aimed at changes necessited by the new pipes. Changing the pilot for that reason is the wrong thing to do.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
I That is why the pilot most likely needs to be changed. Putting less restrictive pipes on makes the engine run leaner weather it be idle or above. Since the engine is lean to start with putting less restrictive pipes on makes it leaner making it more likely the pilot would need to be changed rather than just adjusted. That would have to be with a main change too, lets not forget that part of the equasion. I would try adjusting the pilot first but it probably needs to be a size bigger. If you are going to mod the intake side then do that now then make your adjustments.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confused
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
Sounds good, I'll remove the snorkel/snorkels next chance I get. No garage and looks like rain all weekend..  Thanks again, I'll let you know how it turns out.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
Yes, my mileage is in km.  I probably won't be able to do any work on the bike until Monday night. Weather is not cooperating this week end. Thanks for the info, and I'm going to remove the snorkels as suggested.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Dec 2005
Posts: 604
Adjunct
|
|
Adjunct
Joined: Dec 2005
Posts: 604 |
I have pods & SS pipes and originally used the 45s that came with the pipes.
Then I added a bit of restriction to the pipes and it started stumbling off idle.
Had to go back to 42s.
My take was that even with pods, the 45s are pretty generous.
Said Molly to James, that's a fine motorbike.
Richard Thompson
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
Depends on altitude too, I run 48s in mine with 155 mains. Now I have gutted stock pipes too so I have very little restriction. Just saying what works for one doesn't always work for the next guy. There are many factors to take into account.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
I've opened up the top of the airbox, removed that snorkel. Checked the plugs. Very black.
The adjustment screws are now at 3/4 turn out. Weather has been too wet for me to check the plugs. But I'm pretty sure its still too rich. Weather looks like it'll let up Thursday. I'm going to turn the screws another 1/4 in tomorrow. And check the plugs Thursday if nothing changes. I'll be looking for 42 pilots real soon I think.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Had to go back to 42s. My take was that even with pods, the 45s are pretty generous.
A larger pilot jet is almost never needed. The greatest air restriction in the system at idle and off-idle is in the carbs themselves. Usually, only changing to a more radical cam profile (or opening a very restrictive system after installing a radical cam) necessitates reworking the idle circuit. Even then, it's the result of intake charge dilution, not increased throughput at idle.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
Quote:
Quote:
Had to go back to 42s. My take was that even with pods, the 45s are pretty generous.
A larger pilot jet is almost never needed. The greatest air restriction in the system at idle and off-idle is in the carbs themselves. Usually, only changing to a more radical cam profile (or opening a very restrictive system after installing a radical cam) necessitates reworking the idle circuit. Even then, it's the result of intake charge dilution, not increased throughput at idle.
Jack
Again not true, As soon as you start to raise the slides you lower the restriction and the pilots are still feeding fuel up until around mid throttle.Phil actually posted a good graphic illustrating this, if I can find it I'll add it to this thread. You need to use the correct combination of pilot and main to get an over all correct mixture. This is not saying the pilot always needs to be changed but to say it's almost never needs is incorrect. It all depends on what changes are made. Sometimes adjustment of the mixture screws is enough and others a change of pilot jet combined with the main change is called for.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
I found it, I had saved it on my computer so I just uploaded it. Notice that the pilot feeds up to just about 1/2 throttle.  Hope this is of some help as to what needs to be done for proper jetting.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Quote:
Quote:
Had to go back to 42s. My take was that even with pods, the 45s are pretty generous.
A larger pilot jet is almost never needed. The greatest air restriction in the system at idle and off-idle is in the carbs themselves. Usually, only changing to a more radical cam profile (or opening a very restrictive system after installing a radical cam) necessitates reworking the idle circuit. Even then, it's the result of intake charge dilution, not increased throughput at idle.
Jack
Again not true,
Of course it's true. That's why the real world experiences noted in this thread indicate the need to reinstall the stock pilot jet. There was a time when opening the pipes on almost any gas vehicle required changes to idle circuits or accelerator pumps. However, milder cams, lower compression ratios and CV carbs have changed the environment in which these mods are being performed.
You don't have to believe me on this point. From "Jenks Bolts Tuning Notes" (the source of the chart you posted):
"Setting up the main jet must be done first - before
moving on to the other operating tuning ranges."
and
"Bonneville: Unless you have a problem with
cold starting leave the stock pilot jets at
(Bonnie 40, America 42)."
Finally, note that the modification tables in this publication list examples such as "Open Exhaust" and "Airbox Removed." In no case does any bike with a 865cc motor require anything other than a stock pilot jet.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
|
|
Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Or maybe it's not true in every situation.
I'm running 42s in my 790 America with Specialty Spares and a K&N in an unmodded airbox. But, after fitting K&N pods and Commando Specialty Burgess Replicas to my 01 Bonnie (again a 790) I had to up the pilots to 45s to achieve good performance. And that scoot's getting 51mpg on the highway unless the rider is overly exuberant.
The same situation applies to my Dyna and its Keihin CVK as well. Open pipes and a free flowing Kuryakyn Hypercharger with a K&N had me up size that pilot as well to achieve proper performance.
The truth is more likely that each bike has to be fitted to suit it and not some template printed by Jenks (who is a Thruxton aficionado) or anyone else for that matter. Only the Dyno's A/F chart knows for certain and without that in your hands you're only guessing.
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Or maybe it's not true in every situation.
I'm running 42s in my 790 America with Specialty Spares and a K&N in an unmodded airbox. But, after fitting K&N pods and Commando Specialty Burgess Replicas to my 01 Bonnie (again a 790) I had to up the pilots to 45s to achieve good performance.
The difference is probably due to the cams. Higher profiles and greater overlap dilute the charge at idle and off-idle. The dilution increases when the exhaust is modified for less back pressure. You probably moved the '01 motor just outside the window of adjustment available with the stock jet. Or... there might have been another tuning scenario (larger main, different taper, etc.) that wouldn't have required a different pilot. In any event, this is less of an issue for later models, and that's shown in the tables I referred to above.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
And that just proves what I have been saying. I never said that the pilot needs to be changed in every case. I said that to make a blanket statement that the pilot doesn't need to be changed is incorrect. I went on to say that there are many circumstances to be taken into account. I run 48 pilot and 155 main and am very close to perfect across the board. I also have a 790 and the jetting for that would certainly be different than the 865 due to the difference in the cam. Then there is where you live and the humidity and barometric pressure. There are many different pipe configurations many different intake configurations. Then there are the differences from one carb to the next and so on. With all the variables you can not make a blanket statement like that and have it hold true. I have worked on all 790s so far and almost every one has needed to go to at least a 45 pilot making it so the mixture screw doesn't need to be hanging out of the carb to get close to the right mix. (hanging out is an exageration read it as more than 3 turns out.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
I should also add that when I first gutted my stock pipes and got rid of the air box and AI I put my bike on the dyno.I had installed the 160 main that came with the Freak but didn't change the 42 pilot. It was so lean until about 1/2 throttle that it didn't even register on the dyno chart. Then just beyond 1/2 throttle it was nearly perfect with 160 mains in it.Now with the 155 main and 48 pilot I'm good, so close I don't want to mess with it.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...In no case does any bike with a 865cc motor require anything other than a stock pilot jet.
Jack
Such generalization is misinformation from my perspective. Stock, no argument. Modified? Then it depends on the facts & cirumstances.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Quote:
...In no case does any bike with a 865cc motor require anything other than a stock pilot jet.
Jack
Such generalization is misinformation from my perspective.
No one is generalizing. See the chart.
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
[quote
No one is generalizing. See the chart.
I don't understand.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: May 2008
Posts: 23
Complete Newb
|
|
OP
Complete Newb
Joined: May 2008
Posts: 23 |
I just read the last 10 or so posts.. my head is spinning.
I turned the adjustment screws to 1/2 turn out and was getting popping on deceleration. This indicates too lean? Right?
So I adjusted to 2/3 turn out, still a tad bit of popping but not nearly as much. Think I'll go back to 3/4 out. I'm still thinking of ordering the 42's.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2007
Posts: 23,236 Likes: 63
Fe Butt
|
|
Fe Butt
Joined: Feb 2007
Posts: 23,236 Likes: 63 |
sounds like the 42s would be in order to me. Normally ideal adjustment is around 2 to 2 1/2 turns out but it doesn't have to be. More important is the right mixture. You should have just a little popping or rumble on decel but not excessive. Instead of guessing you should do a proper adjustment.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...I turned the adjustment screws to 1/2 turn out and was getting popping on deceleration. This indicates too lean? Right? So I adjusted to 2/3 turn out, still a tad bit of popping but not nearly as much. Think I'll go back to 3/4 out. I'm still thinking of ordering the 42's.
Decel popping on rolloff is a lean sign, but a little decel popping is fine. You're probably good to go at 2/3rds out. If it is running well at that setting then I'd leave it alone. Maybe a touch more out, but just a touch.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Dog & I are really after the same outcome, & either way will get you there.
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Jul 2008
Posts: 1,440
Learned Hand
|
|
Learned Hand
Joined: Jul 2008
Posts: 1,440 |
Quote:
Quote:
No one is generalizing. See the chart.
I don't understand.
Here's the publication under discussion - Jenks Bolts Tuning Notes:
http://www.triumph-bonneville.com/images/Carb%20Jetting%20Info%202007.pdf
The chart Dog posted is on page 5 of this publication. The table recommending that all 2006 865cc bikes use stock pilots is on page 10. This is what I was referring to. It wasn't my opinion. Read through this doc and you'll see that it contradicts a number of the statments made in this thread. Read through the thread and you'll also see that all or most of my generalities are not absolutes. I always try to make room in my assertions for exceptions. In this case though, the OP doesn't have an exceptional (unusual) setup. There's no reason to have installed a larger pilot.
Jack
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
|
|
|
Re: 07 America jetting, SS Long Cannons, I'm confu
|
Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
|
|
Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...This is what I was referring to. It wasn't my opinion...
I read that Jenks manual previously, as have presumably many others on this forum. And IMO Jenks is wrong on the pilot generalization for 865 BA/SM's. You are of course welcome to believe otherwise.
|
|
|
|
|
