Wide open throttle when idling.

Message

MexicanMafia · Mon Jan 28, 2008 10:31 am

ok so i just got a 84 honda cb650sc with 15k miles on it. i was riding just fine all day but on my way home i got on it a lil and when i let off the throttle closed but the bike kept goin full throttle. so i check my pants, shut it off and pull over so tried restarting it and immediatly it started revving outta control. so i shut it off.(i noticed a lil gas comin outta the far right carb.) the throttle won't snap back but i can force it back and i see the cable moving the butterflys open and shut (to the point where the tension on the throttle cable is released)but it won'd stop the revs. now i can't start it without having to turn it off cause it revs til redline. any ideas on what to look at first??? thanks.

slimcolo · #2 Unread post by **slimcolo** » Mon Jan 28, 2008 10:35 am

Check for fraying of cable(s) might be inside housing

MexicanMafia · Mon Jan 28, 2008 10:55 am

i'll check but what if i can see the throttle open and closing the butterflys?? thanks.

MexicanMafia · Mon Jan 28, 2008 12:01 pm

no fraying of the lines, and now it won't even start.

MrShake · #5 Unread post by **MrShake** » Tue Jan 29, 2008 3:41 am

Is the choke closed or open?

MexicanMafia · Tue Jan 29, 2008 5:01 am

both. i've been told it's a stuck float.

Tue Jan 29, 2008 5:47 am

MexicanMafia wrote:both. i've been told it's a stuck float.

That would just continue to let gas go into the carb. Without air getting into the system that's not going to be the issue. So if the butterflys are closed and it's still reving like crazy, then it's getting air from somewhere.

Check to make sure all your vaccum lines are hooked up well and that there aren't any cracks in these lines or the carb boots. Make sure the carb boots are tightened well.

Pongo · #8 Unread post by **Pongo** » Thu Jan 31, 2008 4:39 am

If it isn't your throttle cable or linkage sticking. I would suggest cleaning the carbs (maybe get a carb rebuild kit) you might have a main jet needle sticking wide open.

You will also need a service manual. Clymer have a good one for the 1983-85 CB 650.

MexicanMafia · Fri Feb 01, 2008 2:48 am

i took the carbs off and went thru them. all new stuff, turned out to be a piece of glass lodged in the throttle linkage that wouldn't fall out.

Fri Feb 01, 2008 2:49 am

MexicanMafia wrote:i took the carbs off and went thru them. all new stuff, turned out to be a piece of glass lodged in the throttle linkage that wouldn't fall out.

How on earth did that get in there?