 My dyno run !!!!!
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Joined: Sep 2005
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Freelance Jedi Knight
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OP
Freelance Jedi Knight
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Long story short...after 18 runs  final result is: -power 67.12 hp -torque 54.37 ft/lbs (73.71 Nm) not bad I think will post prointout when will get it a scanned bike: - 2001 Bonneville America 904 - stock airbock with K&N filter snorkels removed - intake snorkel shortened - Keihin CR Special carbs!! - 108 main jet - Epco exhaust been on Dyno last week but would like not to mention results  (way too rich) ... after some advise from mechanic went down 7 numbers with main jet difference was huge....in my feelings  anyway after riding Thunderbird this morning went for dyno run and first run showed much improvement (61 hp ,125 main jet) but still too rich. CR carbs are so easy to work with and changing jets is 5 minute job, we found 112 mains in workshop and put them on .....improvement again (65hp) but still a bit rich we found 108 mains,put them on and final result as I wrote above 67 hp !!! print looks good mechanic said leave it like that showed print to 4 others mechanics in different garages I know and they are impressed 
Last edited by Grzegorz; 07/12/2009 4:44 AM.
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Re: My dyno run !!!!!
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Joined: Jan 2005
Posts: 1,012
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,012 |
Good numbers Grzegorz..  I will race you in a couple of weeks! 
Gooseman
Bonneville America 904 Black/Silver
Triumph Tiger 1050 Black
Ducati Multistrada 1200s
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Re: My dyno run !!!!!
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Joined: Jan 2005
Posts: 2,416
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,416 |
Looking good Greg! I was wondering why you didn't write sooner. Now I know! 
"Wise men speak because they have something to say, fools because they have to say something."
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Re: My dyno run !!!!!
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
Long story short...torque 55.37 ft/lbs (73.71 Nm)...
The run looks great, however your print out shows 54.37 max torque measured DIN, 1.03 CF. Please explain the quoted 55.37 torque figure.
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Re: My dyno run !!!!!
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
My feeling is that most all do it yourselfers that can't do repeated dyno testing end up with way large main jets than they should be running. I have a 904 and have had numerous dyno tests and am still using 125 mains. I do start to lean out above 6K, but the main power range I can't argue with. At 5250 rpm where the torque and hp cross, I'm at just barely under 60. My torque peaks at 65.54 (3408 rpm) and the hp is just under 75 at redline.
I went with the better judgement of D&D Cycles (Pensacola, FL). They said that almost every bike that is brought in people have worked on have too large main jets in them. Even if you are able to get the hp at the very top end it usually hurts the main range everyone should care the most about. Lower the mains and adjust the needles for best performance.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: My dyno run !!!!!
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Joined: Dec 2006
Posts: 2,150
Oil Expert
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Oil Expert
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Posts: 2,150 |
Well done Grzegorz. Those are very nice numbers and your air/fuel is one of the best I can remember. Mind you my memory isn't that flash anyway While you're there, do you want me to put your numbers in the Dyno Table?
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
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Re: My dyno run !!!!!
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Joined: Jan 2005
Posts: 2,664
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,664 |
Quote:
I went with the better judgement of D&D Cycles (Pensacola, FL). They said that almost every bike that is brought in people have worked on have too large main jets in them. Even if you are able to get the hp at the very top end it usually hurts the main range everyone should care the most about. Lower the mains and adjust the needles for best performance
I've preached it for several years and Dale at Specialty Spares confirmed exactly what you are saying. I have SS long slash cuts, UNI filter, upper snorkel removed. DynoJet kit with 128 mains, 45 pilots turned out 3.5 turns. I am a bit rich on the top end, but still in range. 145 & 155 mains? A waste of fuel for the open road. But get a dyno done to make sure.
Ride Safe,
Dennis
Triumph, it's how I live and what I ride.
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Re: My dyno run !!!!!
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Joined: Dec 2006
Posts: 2,150
Oil Expert
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Oil Expert
Joined: Dec 2006
Posts: 2,150 |
You've got a good point there Bob. I guess all my knowledge has basically come from this website the collective knowledge of all other members. So how about having a look at my last dyno which shows my bike is running rich, and tell me what main jets ( and pilots while you're at it) you think I should use.  Btw, I have already taken the shim of the needles and I think 42 pilot jets would be more appropriate. Anyone else who wants to chime in here with there two bobs worth is welcome as well cos I appreciate constructive criticism as long as it can get my bike's air/fuel more balanced. cheers staffo. 
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
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Re: My dyno run !!!!!
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Joined: Sep 2005
Posts: 3,816
Freelance Jedi Knight
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OP
Freelance Jedi Knight
Joined: Sep 2005
Posts: 3,816 |
Quote:
Quote:
Long story short...torque 55.37 ft/lbs (73.71 Nm)...
The run looks great, however your print out shows 54.37 max torque measured DIN, 1.03 CF. Please explain the quoted 55.37 torque figure.
my mistake when typing 
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Re: My dyno run !!!!!
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Joined: Sep 2005
Posts: 3,816
Freelance Jedi Knight
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OP
Freelance Jedi Knight
Joined: Sep 2005
Posts: 3,816 |
Quote:
You've got a good point there Bob. I guess all my knowledge has basically come from this website the collective knowledge of all other members.
So how about having a look at my last dyno which shows my bike is running rich, and tell me what main jets ( and pilots while you're at it) you think I should use.
Btw, I have already taken the shim of the needles and I think 42 pilot jets would be more appropriate.
Anyone else who wants to chime in here with there two bobs worth is welcome as well cos I appreciate constructive criticism as long as it can get my bike's air/fuel more balanced.
cheers
staffo.
on one of my runs air/fuel ratio looked similar mess and we went down with main jets..... I haven't got all prints from every runs unfortunately
in my case we went from 125 to 108 main and its 8 numbers down
I would go 4 numbers down and try how it goes on the road if you happy go on dyno
my Dyno guy had some notes and he advised strait away what we should try (he never worked before on those carbs)
Last edited by Grzegorz; 07/12/2009 11:48 AM.
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Re: My dyno run !!!!!
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Joined: Dec 2006
Posts: 2,150
Oil Expert
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Oil Expert
Joined: Dec 2006
Posts: 2,150 |
what do you reckon I try 135 mains and 42 pilots?
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
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Re: My dyno run !!!!!
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
The fact that you have a Freak instead of the airbox would normally require larger mains than non freak. I would still start by dropping the mains a size or two and going back to the 42 pilots. You can always go back up on the pilot jets after the mains and needles are dialed in if you need to.
I certainly don't consider myself an expert and I also am working with collective information. The D&D guys did wonders with my bike as far as getting maximum torque and power in the midrange and getting the proper A/F mixture.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: My dyno run !!!!!
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Joined: Sep 2005
Posts: 3,816
Freelance Jedi Knight
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OP
Freelance Jedi Knight
Joined: Sep 2005
Posts: 3,816 |
Quote:
what do you reckon I try 135 mains and 42 pilots?
I'm not an expert and got different carbs but in my case dyno run showed ;61hp with 125 jet and was too rich, then we went down 5 numbers on main to 112 65hp but still a bit rich then down again 2 numbers to 108 main and that was final result 67hp as you can see on my print.
bloke who made my dyno runs is working with superbikes on daily basis and I trusted his knowledge but was a bit surprised that we should go down 5-6 numbers on main jet...we went 7 and is spot on
I would go this way what you said 135 and try different pilot always good to compare result and see maybe something between is right for you
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Re: My dyno run !!!!!
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Joined: Dec 2006
Posts: 2,150
Oil Expert
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Oil Expert
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Posts: 2,150 |
Thanks for your comments Bob and Grzegorz. You know, when I think about it both my A/F ratio charts have been in the rich which is why I need to now experiment a bit more with my settings.
Bob, the only jets smaller that I have at the moment which I could use are 135 which for me might be just a little too small for my liking.
I think now that I have already gone down from 150 to 145 since my last dyno, the next step I'll try is going down to 42 pilots and see how it feels then.
Regarding your comments Grzegorz, like Bob has said already, it appears it is hard to compare settings of those who still have the stock air box compared to pod filters but I think the sentiment is much the same.
cheers
staffo
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
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Re: My dyno run !!!!!
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Thought I might as well post my dyno results. This was a tuning exercise so the graph shows before and after. And the numbers are AT THE WHEEL. 
Live to love, love to live.
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Re: My dyno run !!!!!
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Joined: Dec 2006
Posts: 2,150
Oil Expert
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Oil Expert
Joined: Dec 2006
Posts: 2,150 |
Staintune Pipes, K&N Pods, 45 pilots, TBS needles and 145 mains.
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Re: My dyno run !!!!!
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Joined: Jan 2005
Posts: 138
Adjunct
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Adjunct
Joined: Jan 2005
Posts: 138 |
hey staffo,
if you want some 140 mains let me know and i will send you some
stv
GRAND MASTER WIZARD
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Re: My dyno run !!!!!
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Joined: Apr 2007
Posts: 3,061 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,061 Likes: 8 |
Quote:
Thought I might as well post my dyno results. This was a tuning exercise so the graph shows before and after. And the numbers are AT THE WHEEL.
Keith,
Could you post your set up? Displacement, needles, shims, mains, pilots, etc etc. Thanks for posting your run.
I'm really beginning to wonder about my seat of the pants jet sizing ability. Full throttle runs, backing off on throttle to notice if bike accels or decels, checking plug colour, comparing to others who have posted is all myself and many others have to go on (no dyno).
I'm guessing I'm too rich. Why do the Bonny riders with 360 engines all seem to run 110 pilots, smaller mains, and more aggressivly tapered needles (Thruxton) but have higher stock HP.....Cams????
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: My dyno run !!!!!
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
Quote:
...I'm guessing I'm too rich. Why do the Bonny riders with 360 engines all seem to run 110 pilots, smaller mains, and more aggressivly tapered needles (Thruxton) but have higher stock HP.....Cams????
Most butt-dyno tuned bikes are jetted too rich on the mains. None of the twins run 110 pilots.
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Re: My dyno run !!!!!
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Joined: May 2007
Posts: 6,432 Likes: 1
Worn Saddle
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Worn Saddle
Joined: May 2007
Posts: 6,432 Likes: 1 |
Quote:
...I'm guessing I'm too rich. Why do the Bonny riders with 360 engines all seem to run 110 pilots, smaller mains, and more aggressivly tapered needles (Thruxton) but have higher stock HP.....Cams????
I think it's the cams and the 360° timing that affect the numbers more than anything else. My '01 Bonnie ended up with stock needles, 42 pilots and 145 mains, K&N pods and Emgo reverse cones and it ran like a scalded ape. That said, I always felt my America had more power (torgue) across the entire operating range.
Quote:
Most butt-dyno tuned bikes are jetted too rich on the mains.
That's probably true enough since the main jet really only comes into play at WOT and few people actually spend much time there. Truth be told, you could run one of our bikes with no main at all if you never got above 3/4 throttle since the needle does the metering up to that point.
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Re: My dyno run !!!!!
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Joined: Apr 2007
Posts: 3,061 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,061 Likes: 8 |
Quote:
Why do the Bonny riders with 360 engines all seem to run 110 pilots, smaller mains, and more aggressivly tapered needles (Thruxton) but have higher stock HP.....Cams????
Opps I meant 40 pilots and 110 mains.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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