Revving Issues

[kparrott]

I took Dale, my 1980 GS550, on a ride this weekend, 125 miles yesterday and 63 today. In the first 50 miles everything was fine, then he decided to start revving really high everytime I pulled the clutch coming to a stop or downshifting.

I adjusted the idle screw so he'd idle lower, but then he would gradually rev higher and higher each time I'd stop and every time I used the clutch he would rev really high.

Any ideas?? Thanks

[tom203]

I took Dale, my 1980 GS550, on a ride this weekend, 125 miles yesterday and 63 today. In the first 50 miles everything was fine, then he decided to start revving really high everytime I pulled the clutch coming to a stop or downshifting.

I adjusted the idle screw so he'd idle lower, but then he would gradually rev higher and higher each time I'd stop and every time I used the clutch he would rev really high.

Any ideas?? Thanks

So this came on suddenly, or has it been haunting you for a while? Did Dale get a new handlebar or throttle cable recently? Probably not, so you probably have an intake manifold air leak- old dried out carb boots or o-rings will allow air to bypass carbs resulting in high revs, especially when clutch is pulled in. Search this forum, cuz this problem is #1 on the charts.

[bobthebiker88]

definitely sounds like you have an air leak or four. carb boots are most likely if they havent been replaced recently.

[kparrott]

So this came on suddenly, or has it been haunting you for a while? Did Dale get a new handlebar or throttle cable recently? Probably not, so you probably have an intake manifold air leak- old dried out carb boots or o-rings will allow air to bypass carbs resulting in high revs, especially when clutch is pulled in. Search this forum, cuz this problem is #1 on the charts.

If you are talking about the carb boots from the carb to the engine then that is probably it. They are cracking around the bases. I've got those boots on order and have new O-rings ready to go.

[Nessism]

I wish we had a sticky for this question. We get someone new about once a week with this same problem.