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surging Idle problem
Posted: July 2nd, 2011, 12:16 pm
by shwinny
My bike is getting a bad surging at idle and decelerating. when i goose the throttle it goes away until i let the throttle go and it surges. I have the sub frame off/ gas tank off/ and the cylinder looks ok. the reeds look ok. Plenty of compression. The 55 pilot jet was kind of clogged so i put in a 52 jet and it still surged. the bike rips really sick when i goose it. and i mean it rips scary fast when i twist the throttle but it is surging at idle and deceleration. .
It has a 170 main 52pilot now it had a 55 which was kind of clogged and its on the third clip from the top. I am stumped on where to go next. the engine was rebuilt 20hrs ago by the previous owner. should i try a leak down test or what not. i hope you guys can help me out. i did try searching but i had no luck.
Posted: July 2nd, 2011, 1:41 pm
by Tharrell
Crank seals or other air leaks?
Re: surging Idle problem
Posted: July 14th, 2011, 7:26 am
by CR500PHIL
shwinny wrote:My bike is getting a bad surging at idle and decelerating. when i goose the throttle it goes away until i let the throttle go and it surges. I have the sub frame off/ gas tank off/ and the cylinder looks ok. the reeds look ok. Plenty of compression. The 55 pilot jet was kind of clogged so i put in a 52 jet and it still surged. the bike rips really sick when i goose it. and i mean it rips scary fast when i twist the throttle but it is surging at idle and deceleration. .
It has a 170 main 52pilot now it had a 55 which was kind of clogged and its on the third clip from the top. I am stumped on where to go next. the engine was rebuilt 20hrs ago by the previous owner. should i try a leak down test or what not. i hope you guys can help me out. i did try searching but i had no luck.
Sounds like the change from 55 to 52 pilot maybe your problem. Surging on decelerating is often a sign of a lean pilot - or a lean condition for another reason such as others suggested. If this all started when you leaned the pilot circuit, I would say get another 55 and replace the clogged one you took out.
Re: surging Idle problem
Posted: July 14th, 2011, 11:01 am
by AlisoBob
CR500PHIL wrote: If this all started when you leaned the pilot circuit, I would say get another 55 and replace the clogged one you took out.
Yup....
Posted: July 14th, 2011, 6:56 pm
by iggys-amsoil
Turn the mixture screw in to 1/2 a turn out.
Posted: July 14th, 2011, 7:47 pm
by 2strokeforever
try a richer meedle straight.... it made my bike a lot better down low
Posted: July 14th, 2011, 8:12 pm
by 100hp honda
2strokeforever wrote:try a richer meedle straight.... it made my bike a lot better down low
if theres a surge down low but the pilot doesnt fix it you think a smaller diameter needle may do the trick ? trying to chase down a problem