Uneven power when starting and from 35-45mph - Page 2

VTXorcist · 07-22-2009, 09:13 AM

Update on the problem; I haven't had a chance to do any work, but I took it for a quick spin yesterday to see if I could be a little more specific about the symptoms.

It revs and then loses power at idle, 1st, and 2nd. It seems particularly bad until the bike has had 10 minutes or so to warm up, and then it still happens occasionally. Basically, I twist the throttle, it starts to rev, and then goes back to idle and sounds like it's going to stall. Then, if I keep the throttle twisted, there's a chance it will either stall or, if I'm lucky, catch again and start revving. If it stalls, it starts right back up again, no problem.

I'm going to try as many of the above recommendations as I'm able to figure out & am comfortable doing on my own this weekend. If anyone has any other suggestions or diagnoses in the meantime, please let me know!

And thanks for all the info so far. You guys/gals are right; this is a comfortable forum!

bonehead · 07-22-2009, 10:38 AM

It really sounds to me like you have a valve adj. problem. Have you checked the adj or do you know when it was done last?

Easy Rider · 07-22-2009, 10:41 AM

Quote:

Originally Posted by VTXorcist

Basically, I twist the throttle, it starts to rev, and then goes back to idle and sounds like it's going to stall. Then, if I keep the throttle twisted, there's a chance it will either stall or, if I'm lucky, catch again and start revving.

That sounds a LOT like what happens if you try to run it without an air cleaner element in place.........SO I think it is likely that you have too much air/not enough fuel going through the carb. That's the easy part; not to figure out WHY !! :biggrin:

Water Warrior 2 · 07-22-2009, 05:09 PM

The combo of a holed exhaust and no air filter(?) will play havoc with any fuel delivery to the cylinder. As mentioned, check for an air filter. A new filter and a properly intact exhaust may be the answer to the running conditions. I would suggest not tearing the carb apart until the other 2 things are dealt with. Use the KISS principle.

VTXorcist · 07-23-2009, 08:33 PM

UPDATE:

You know that crack in my pipe? Well, I finally got the new pipe in the mail today and went to replace it just now. I removed the rear support bolt that holds the megaphone in place... and it fell off! The dang thing was cracked clean through. I'll let you know this weekend if it helps at all, once I've had a chance to take it out for a bit.

VTXorcist · 07-23-2009, 08:34 PM

Oh and I replaced my spark plug and checked the air filter; it looks good and I cleaned it with compressed air per the service manual.

07-22-2009, 09:13 AM	#11
VTXorcist Senior Member Join Date: Jul 2009 Location: Raleigh, NC Posts: 114	Re: Uneven power when starting and from 35-45mph Update on the problem; I haven't had a chance to do any work, but I took it for a quick spin yesterday to see if I could be a little more specific about the symptoms. It revs and then loses power at idle, 1st, and 2nd. It seems particularly bad until the bike has had 10 minutes or so to warm up, and then it still happens occasionally. Basically, I twist the throttle, it starts to rev, and then goes back to idle and sounds like it's going to stall. Then, if I keep the throttle twisted, there's a chance it will either stall or, if I'm lucky, catch again and start revving. If it stalls, it starts right back up again, no problem. I'm going to try as many of the above recommendations as I'm able to figure out & am comfortable doing on my own this weekend. If anyone has any other suggestions or diagnoses in the meantime, please let me know! And thanks for all the info so far. You guys/gals are right; this is a comfortable forum! __________________ Orange is the fastest color. Red is a close second. Login or Register to Remove Ads
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07-22-2009, 10:38 AM	#12
bonehead Senior Member Join Date: May 2009 Location: elgin,tx Posts: 907	Re: Uneven power when starting and from 35-45mph It really sounds to me like you have a valve adj. problem. Have you checked the adj or do you know when it was done last? __________________ Standing with the PGR until they stand for me.
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07-22-2009, 05:09 PM	#14
Water Warrior 2 Senior Member Join Date: Dec 2006 Location: Squamish B.C Canada Posts: 11,409	Re: Uneven power when starting and from 35-45mph The combo of a holed exhaust and no air filter(?) will play havoc with any fuel delivery to the cylinder. As mentioned, check for an air filter. A new filter and a properly intact exhaust may be the answer to the running conditions. I would suggest not tearing the carb apart until the other 2 things are dealt with. Use the KISS principle.
	0

07-23-2009, 08:33 PM	#15
VTXorcist Senior Member Join Date: Jul 2009 Location: Raleigh, NC Posts: 114	Re: Uneven power when starting and from 35-45mph UPDATE: You know that crack in my pipe? Well, I finally got the new pipe in the mail today and went to replace it just now. I removed the rear support bolt that holds the megaphone in place... and it fell off! The dang thing was cracked clean through. I'll let you know this weekend if it helps at all, once I've had a chance to take it out for a bit. __________________ Orange is the fastest color. Red is a close second. Login or Register to Remove Ads
	0

07-23-2009, 08:34 PM	#16
VTXorcist Senior Member Join Date: Jul 2009 Location: Raleigh, NC Posts: 114	Re: Uneven power when starting and from 35-45mph Oh and I replaced my spark plug and checked the air filter; it looks good and I cleaned it with compressed air per the service manual. __________________ Orange is the fastest color. Red is a close second.
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