 Sluggish at 3,000
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Joined: Dec 2007
Posts: 244
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OP
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Joined: Dec 2007
Posts: 244 |
I have noticed that my TBA is struggling to run smooth in the 3-3.5K rpm. Even after warm up she runs very rough but only in this rpm range. Any thoughts? 
05 BA, Goodwood Green, Chevy605 pipes , ai removed, Freak kit, K&N pods, 145 main/42 pilot / 3 turns out, bags and screen
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Re: Sluggish at 3,000
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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 |
How many miles?
Rough as in rich stumble, lean hesitation, or spark cut-out?
All the time or intermittent?
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Re: Sluggish at 3,000
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Joined: Apr 2007
Posts: 3,063 Likes: 8
Loquacious
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Loquacious
Joined: Apr 2007
Posts: 3,063 Likes: 8 |
If you are talking about a some high frequency vibration, they all seem to vibrate a bit at that particular RPM. Try balancing the carbs. Worked for me.
12 Rocket Roadster
03 Bonneville America
69 BSA Firebird Scrambler
73 Yamaha TX 750
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Re: Sluggish at 3,000
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Joined: Dec 2007
Posts: 244
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OP
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Joined: Dec 2007
Posts: 244 |
Thanks - Rough as in hesitation. It was mostly when cold and still seems mostly when cold but sometimes even 15-30 minutes into a ride. No vibration. It is a lag or like it is cutting out, once accelerated through that RPM, she runs normal at 3500+ and from idle to 3000.
I have 24,000 miles and changed out the plugs about 6 months ago. The lag was there before and after the plug change out.
Last edited by pharmboy327; 06/26/2011 11:58 PM.
05 BA, Goodwood Green, Chevy605 pipes , ai removed, Freak kit, K&N pods, 145 main/42 pilot / 3 turns out, bags and screen
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Re: Sluggish at 3,000
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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 |
Presuming that the slides are not hanging up, & there are no vacuum leaks (such as cracked squirrel condoms) & the slide diaphrams are not cracked, then I suggest trying 1 shim on the needles...is yours a 790 with stock needles?
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Re: Sluggish at 3,000
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Joined: Dec 2007
Posts: 244
Adjunct
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OP
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Joined: Dec 2007
Posts: 244 |
Yes. It is a 790 with stock needles. Thanks for the suggestion on shims.
05 BA, Goodwood Green, Chevy605 pipes , ai removed, Freak kit, K&N pods, 145 main/42 pilot / 3 turns out, bags and screen
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Re: Sluggish at 3,000
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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 |
Hey, let us know how it goes.
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Re: Sluggish at 3,000
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Joined: Mar 2009
Posts: 520
Adjunct
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Adjunct
Joined: Mar 2009
Posts: 520 |
sync your carbs mine was doing the same thing
2005 America 145 mains, , #48 pilots, , k&n pod filters, ported intakes manifolds, nology coils and wires, pro com CDI, 62 HP at wheel 68,000 hard miles still runs great gone "traded"
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Re: Sluggish at 3,000
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Joined: Aug 2005
Posts: 2,525
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,525 |
I had a big flat spot around 3-3500rpm and this site recommended TBS needles. It seems to be a very similar problem to yours. I put them in and it runs like a champ now. You can read more about it HERE. Definetly balance your carbs though! Cudos to Dinqua!
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Re: Sluggish at 3,000
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Joined: Dec 2007
Posts: 244
Adjunct
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OP
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Joined: Dec 2007
Posts: 244 |
I will try the needles and the balance. I will have to go to the dealership for a balance as I dont think I can do that one. The needles I may be able to do myself.
05 BA, Goodwood Green, Chevy605 pipes , ai removed, Freak kit, K&N pods, 145 main/42 pilot / 3 turns out, bags and screen
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Re: Sluggish at 3,000
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Joined: Aug 2005
Posts: 2,525
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,525 |
dont underestimate yourself. Balancing them is pretty simple just need a synch tool. You could make one as some people have done or buy one. TOOL. and then theres plenty of support here on the site or HERE . Itll pay for itself the first time you use it. Good luck. 
Erwin
05 America
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Re: Sluggish at 3,000
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Joined: Mar 2008
Posts: 1,586 Likes: 1
Learned Hand
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Learned Hand
Joined: Mar 2008
Posts: 1,586 Likes: 1 |
I also have one that is doing the same,dealer can't seem to get it right.Thanks guys.
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Re: Sluggish at 3,000
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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 |
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Re: Sluggish at 3,000
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Joined: Jan 2007
Posts: 706 Likes: 1
Adjunct
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Adjunct
Joined: Jan 2007
Posts: 706 Likes: 1 |
Quote:
I have noticed that my TBA is struggling to run smooth in the 3-3.5K rpm. Even after warm up she runs very rough but only in this rpm range. Any thoughts?
has the bike always struggled at this rev range?
if not maybe a carb sync is in order,maybe even some crap in the working of 1 of the carb's 
04 yellow&black Speedmaster+the Money Pit{xj jeep}
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