Hi, All - This is a "ping" for a thread that storm16 started a couple of weeks ago. When you crack open the throttle on his bike, the engine revs up nicely....release the throttle and the engine is still revving high. The revolutions only come down in their own sweet time, leaving the rider a little, um, vulnerable to trying to make a turn with the bike zipping along at 4000 rpm in first gear.
Here's what I do know about his baby:
1. We cleaned the carbs and got the choke connecting rod set properly, so his choke works just fine now. Plungers move up and down, and the choke cable has plenty of range.
2. We double-checked that the carbs boots were snugly in place, so there's no vacuum leak from there.
3. The throttle is not sticking - when you release the throttle, the valves snap shut smartly. Even so, the revs will stay ridiculously high.
Some possible culprits, although, Brad, correct me if I'm wrong on these:
1. Carbs still need to be sync'd. We ran outta time for that.
2. Air filters need to be replaced.
3. Cam balancer dampers sound like they need to be replaced.
4. Looks like there may be an oil leak around the rear cylinder head gasket - not major, but there's some drippage there.
My thinking was that the combustion chamber is getting too rich a fuel mixture when the throttle's open - it's almost like once all that stuff's burned off, the idle can come back down to a normal range. But I'm stumped. Anybody got other thoughts on this? Elemental, your certs would come in handy right about now!!