another high RPM idle thread
I hate to do this, but I need some opinions.
I have put over 7,000mi on my '96 vn750 since I got it a year ago(doubling its mileage!). It has always cranked & ran wonderfully. I kept a dose of seafoam in each tankfull throughout the winter, and rode fairly regularly. I remember one 70 degree day in January!
Now, since this spring, I quit dosing with seafoam. I thought more frequent & longer rides would not warrant the seafoam...
At times, ever since I've had the bike, it would rev up when stopped at red lights (at idle). Sometimes I would lean the bike to the right & turn the bars to the right, & it would settle back down @1000 RPM. I looked at the cable routing & tension and they seemed ok to me. I ignored this since it did not happen often.
Now, last weekend I was returning from another fine ride, when I stalled it stopping for the neighbor's lawn mower in the drive. When it cranked back up, it began the high idling again. I rode to the top of the hill & killed the engine like I always do to coast on in. I heard a backfire on shut-down which has never happened before. Ever since that day, it revs up to 4000 RPM as soon as it is getting warm from cold start.
I performed Wolfie's back blow carb cleanout procedure once on each carb yesterday with no difference afterword. I think I may need to remove carbs & give a thorough cleaning...
If I get the bike back to running like before, I will not abandon the seafoam ever again!
So, what do y'all think?
edit: Oh yeah, I have tightened the carb boots once before when I saw black soot at the cylinder side of them. There were no symptoms at that time, though. All rubber seems to be in good shape, too.
Last edited by sculpinyakker; 07-09-2013 at 02:03 PM.