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Throttle sticks in hot weather
Posted: Thu 12. Jul 2001, 23:31
by Ken Block
The throttle on my 1969 R60US sticks open in hot weather. Any suggestions on where to start looking to solve the problem?
Re: Throttle sticks in hot weather
Posted: Fri 13. Jul 2001, 03:16
by Lonnie
Is this the throttle control,(twist grip),or the slides? If the slides,I have had this happen and cured it by ever so slightly honing the slide so it wouldn't stick when it got hot. You must be carefull here so you don't make it too loose,that will create other problems.
Re: Throttle sticks in hot weather
Posted: Fri 13. Jul 2001, 11:41
by Dave Thomas
The carb body could be slightly warped, probably due to over-tightening at some time. When it gets hot it probably changes just enough to make the slide stick. If you disassemble it you should see bright spots where it's been sticking. You can lightly sand these places (use 600 wet-or-dry) until the fit is better. Or replace the carb body.
Re: Throttle sticks in hot weather
Posted: Fri 13. Jul 2001, 20:22
by Ken Block
Dave: Thanks for the info. I'm going to work on my bike this weekend to try and find the problem. Regards, Ken Block
Re: Throttle sticks in hot weather
Posted: Fri 13. Jul 2001, 20:38
by Ken Block
Lonnie: I've have never done any mechanical work more complicated than changing a tire, so please excuse my ignorance. I don't know what a slide is. The throttle grip returns but the motor continues to accelerate. I was going to take a shot at fixing the problem this weekend. Any additional suggestions? Regards, Ken Block
Re: Throttle sticks in hot weather
Posted: Sat 14. Jul 2001, 11:34
by Dave Thomas
The slide is the cylindrical part that moves up and down inside the carburetor when you turn the throttle grip. It has a thin pointed needle inserted into the bottom that moves with it. If you unscrew the large ring off the top of the carb, you can pull the slide (with other assembled parts) straight up and out. You will find the end of the throttle cable is captured in a notch in the slide, and a large spring between the slide and the cap. Be very careful when handling this assemble so as not to damage the needle. You shouldn't need to disassemble things any further if you're just polishing the slide. Good luck with it!
Dave
Re: Throttle sticks in hot weather
Posted: Mon 16. Jul 2001, 14:34
by Ken Block
Dave: Thanks for the info. I disassembled and cleaned the throttle yesterday. I then rode the bike for an hour in 85 degree weather and the problem did not occure. If it does, I'll try your suggestion. Regards, Ken Block
Re: Throttle sticks in hot weather
Posted: Wed 18. Jul 2001, 01:33
by Lonnie
Ken sorry I didn't respond to your inquiry,I was away from this board for a few days. Anyway it seems like Dave told you everything,yes sometimes just cleaning the components is enough.
Lonnie
Re: Throttle sticks in hot weather
Posted: Wed 18. Jul 2001, 17:04
by Ken Block
Lonnie: So far so good with my repair. Regards, Ken Block