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Buell Forum » THUMPer Forum » Buell Blast Thumper Knowledge Vault » Diagnosing problems: » Can't gain full throttle « Previous Next »

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Weighttopowerr
Posted on Tuesday, September 11, 2012 - 10:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Hey guys, so I have an interesting issue.
I have full throttle twist, the cable is fine, my boot is fine, the jet and diaphragm are fine. However the symptom is as if I cannot get the butterfly to open past 40%. Its as if I only have 30-40% of my throttle. I know its running well otherwise (fuel to air ratio) because I am getting great gas mileage. The guys at the bloomington, IN harley dealership (buell lovers) said its a very odd issue, they said the only thing they can think of is to check the butterfly, its little screws and see if the stud they are on is cracked. I did and I didn't see anything wrong with the butterfly. They also said I should check the bushings at the end of the stud (spindle, whatever, the thing that the butterfly is screwed to). How would I go about doing this? While I am enjoying the great gas mileage, I am not enjoying the forced restraint. I think it is worth noting I had put some race fuel in my bike before this issue began. It has been going on for about 400 miles, the vast majority of which were highway/interstate miles and it is getting progressively worse. When it first began on some throttle twists I could get full power. It is getting worse and I'm not trying to have my top speed get down to 45 mphs. It also pulls great at 30% throttle (which is about all it will respond to) at low revs. So I know its running well. Thank!}
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Weighttopowerr
Posted on Wednesday, September 12, 2012 - 09:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Anybody? EZ or Gearhead? It may be running lean at full throttle, and the issue is getting worse. Also its worth noting it seems to give me more throttle when its cold.
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Weighttopowerr
Posted on Thursday, September 13, 2012 - 07:07 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

alright guys,
I went out and started investigating the issue as it is getting worse and two things. the first is when I take off my air cleaner and give it throttle, the needle does not move at all. The second is I put a piece of plastic on the rubber boot I have on the mouth of my carb, and I think it should have been air tight enough to strangle it, but it did not at all. did not even slow the rpms. So where do I check for a vacuum leak besides the boot? I sprayed wd40 all over the damn thing and couldnt get it to slow down at all.

thanks

(Message edited by weighttopowerr on September 13, 2012)
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Ezblast
Posted on Friday, September 28, 2012 - 11:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Check your throttle cable.
Check your vacuum line - make sure it is plugged. Make sure needle isn't jacked from bad shimming.
EZ
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