 re jetting
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Joined: Mar 2009
Posts: 3
Complete Newb
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OP
Complete Newb
Joined: Mar 2009
Posts: 3 |
read the post on removing the baffles. am i going to have to re-jett and if so what jets should i use. i'm not much of a motor head so any advice would be apreciated
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Re: re jetting
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Joined: Jul 2008
Posts: 1,440
Learned Hand
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Learned Hand
Joined: Jul 2008
Posts: 1,440 |
'08 America Blue/White; Custom Headlamps, Custom Lowers, Clearview 20", Bafflectomy
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
When ever you make your exhaust less restrictive you should rejet. To actually get any advantage out of the exhaust you should open up the intake side too so the engine can breathe. The more you do on either or both ends changes what you need to do as far as jetting/ adjusting your carbs. Your location also changes what you need.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Jan 2009
Posts: 198
Adjunct
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Adjunct
Joined: Jan 2009
Posts: 198 |
You came to the right place. listen to what these guys tell ya.
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Re: re jetting
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Joined: Oct 2007
Posts: 1,160
Learned Hand
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Learned Hand
Joined: Oct 2007
Posts: 1,160 |
Not to high jack but I am runing short TOR's and stock fillter would the dealer have rejetted or should I after the 500 mile service. or should I what till I get a replacement K&N.
The calculator show 120 stock and 124 with TOR's. Would this make a big diffrents. I know how to changes jets but have never understode when or why.
Chuck
Life need a little Triumph!
2008 Triumph Speedmaster, Single baffle drag pipes, lots of black powder coatin,K&N pods, AI removed, TBS needles and a procom cdi.
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
That wouldn't make a very big difference but you should probably adjust your pilots. Wouldn't hurt to put the right jets in either but I wouldn't worry too much about hurting anything.Don't take the jet calculator as 100% perfect but rather a very good place to start. I have found it to be very close but just a bit on the rich side.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Quote:
When ever you make your exhaust less restrictive you should rejet. To actually get any advantage out of the exhaust you should open up the intake side too so the engine can breathe. The more you do on either or both ends changes what you need to do as far as jetting/ adjusting your carbs. Your location also changes what you need.
Yup it's all about ballance.
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: re jetting
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Joined: Jan 2009
Posts: 251
Adjunct
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Adjunct
Joined: Jan 2009
Posts: 251 |
If you haven't changed the intake only the exhausts you could run happily on the standards and adjust the pilot screw to run slightly rich. This won't improve performance but will sound well,  (i ran mine for 12 months with this setup) you need to rejet carbs when adjusting both admission and exhaust. (I now have short "open" TORS and modified airbox) the increase in airflow has to be balanced to an increase in fuel. I have a "colourtune" spark plug insert. Great for tune ups and getting your fuel ratio just right at all rev's. 
Mike.
Veho Liberate
Iustus Paratus Prohibeo Penuriosus Effectus
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Re: re jetting
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Joined: Apr 2009
Posts: 1
Complete Newb
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Complete Newb
Joined: Apr 2009
Posts: 1 |
On Pat's calculation chart, I am looking at 124 on the main for rejetting my 2004 standard bonneville. Do I need to change anything else in the carbs? The only change I've made is taking out the air injection system and the rear baffles in both of the stock pipes.
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
After you re-jet adjust the mixture screws and you should be good to go.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Jun 2006
Posts: 1,382
Learned Hand
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Learned Hand
Joined: Jun 2006
Posts: 1,382 |
Jetting makes a HUGE difference. I gutted my stock pipes (AI and snorkel removed) and had mine re-jetted today. Put in Dynojet needles/springs and 125 mains. Started at 2 turns out and it ran a little rough, increased to 2.5 turns out, ran a little better. At 3 turns out it smoothed out perfect and runs like a scaled dog.
'06 TBA - Black, AI and Snorkel removed, K&N Drop In, Gutted Stock Pipes, 145/42, 2 turns out.
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
Should actually do 1 side at a time and turn the mixture screw in until it runs rough then out until it runs rough then split the difference for the correct setting. And about 3 turns or more out it's time to bump the pilot jet up a size.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Jun 2006
Posts: 1,382
Learned Hand
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Learned Hand
Joined: Jun 2006
Posts: 1,382 |
Ian, that is what the tech did I just kinda summarized. He also mentioned that 2 turns out should have been ideal (but it wasn't). I asked why he didn't put in a 130 main, he said the 125 was the biggest he had. He is ordering some 130's and will swap them out when they come in. Although, I don't know how it could run much better than it does now. I'm interested to see the difference...
'06 TBA - Black, AI and Snorkel removed, K&N Drop In, Gutted Stock Pipes, 145/42, 2 turns out.
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Re: re jetting
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
Don, it's not going to help if you put in a larger main than you actually need. My service dealer (D&D) believes in the smallest that produces the best results. You may be fine at 125. My dyno results showed I'm fine at 125. As said above, if you find yourself turning more than 3 turns out, you should try the 45 pilots.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
smallest that produces the best results is not the best for the engine. That would be too lean since you can get slightly better numbers with a lean engine than a properly jetted one. But at the same time damaging the engine.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
When my dealer says best results, he's referring to checking with a sniffer and dyno. I usually end up richening it up a hair from their settings. If anything my bike is running a little rich. I guess the point my dealer was trying to make is that many people put in much larger mains than they really need. If properly analyzed on a dyno, it's a balance between the mains, needles, pilots, and adjustment screws.
I'd definitely rather be a hair rich than too lean. My bike has never had any blueing trouble and my plugs always are on the dark tan side.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
You made it sound like it was by ear, sniffer is definately the way to go.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Apr 2008
Posts: 34
Greenhorn
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Greenhorn
Joined: Apr 2008
Posts: 34 |
I've got EPCOs on my TBA and have the AI removal kit but have not yet installed it. I've never re-jetted either, and the popping in the exhaust plus pipe-blueing seems to be getting worse. Am I hurting my bike by my laziness?
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Re: re jetting
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Joined: Feb 2007
Posts: 23,200 Likes: 58
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,200 Likes: 58 |
Quote:
I've got EPCOs on my TBA and have the AI removal kit but have not yet installed it. I've never re-jetted either, and the popping in the exhaust plus pipe-blueing seems to be getting worse. Am I hurting my bike by my laziness?
You very well could be, running lean will burn your valves among other things.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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Re: re jetting
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
How'd ya make out with your lean running bike? I faced pretty much the same concerns as you with my BA and knew I had to do something about it, so I did. Too lean is risky... summer heat and a lean running bike could spell trouble. Don't risk it and get your bike tuned for your current set up.
Live to love, love to live.
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