The bike starts without choking and sounds good for a few minutes. I'll take off on her, just to keep wind flowing across the engine, and after a couple of minutes the RPMs are sticking high -- about 2000 rpm -- as I try to shift. Sitting in the drive the rpms will stick too, for 5 seconds or so. They always drop to idle.
And speaking of idle, when the high RPM problem occurs, the bike is idling more erratically and will try to die.
I took the carbs off, again, last night and checked the rod connecting the choke plungers. I noticed that one of the plungers was sticking and thought I'd found the problem. I took the plunger apart and cleaned and lubed it. It then moved freely. All the other plungers looked OK.
The bike is also fouling plugs. In the past couple of weeks I've replaced them all -- one at a time -- at least twice. (Everytime I start the bike and run it for any length of time I have to replace a plug).
The carbs were pulled and dipped a few months ago. I replaced all the O-rings in the carbs. I replaced the O-rings under the intake boots the carbs slip into. I checked the diaphrams for tears when I had the carbs apart. I just rebuilt the petcock and fuel is being deliverd as expected (fuel is dispensed when the engine is running). I have an air filter with 22 miles on it in the airbox and it has been lightly oiled. The throttle cable is not too loose or too tight. I've disconnected the choke cable just to make sure it isn't sticking. I cleaned the throttle mechanism to make sure it was returning to position when the throttle is closed. Screws on the carbs are 2 1/2 turns out and adjusting them seems to make no difference. I've balanced the carbs and rechecked balance multiple times. Plugs are black and sometimes wet.
I have not reset the float level in 8 weeks but was certain I'd set it correclty then. I'll gladly check them again if this comes back as a possible problem.
The exhaust system is rotted at the tailpipe and leaks at the premuffler.
Oh. I get a little bit of 'spitting' (very small backfire) on either 3 or 4.
The filter for the airbox sits in a metal frame. The top portion of the frame butts against the plastic airbox top. I can't believe this makes an airtight connection. It doesn't sound like I have a too-much-air problem, but I thought I'd mention it.
As I've demonstrated in the past, I am mechanically disinclined. I'm not sure what to look at next.
Aside from selling the bike and getting into a hobby that follows my skill level a little more closely, does anyone have any suggestions.
One more thing -- I've started this post several times and midway through each time I've thought of something else to check so I'd not post and check that thing only to have it not fix the problem at all. As I was getting ready to press send this time, it occurred to me that maybe the bike is running well when I start her up as she's firing on all 4 ... as I test drive her she fouls a plug and the idle goes to he**. Would this cause the RPMs to stick high. Typically when I encouter this problem I've been in an 'out of time' situation and don't check the plugs. Normally, when I fire her up the next time, I have to replace a plug or two. [See, right now I don't want to send this because I'm sure this is the problem. Odds are, based on my history, that not sending it and trying to fix the problem myself would be fruitless ... and I'd find myself here in a day or two typing in a War And Peace length help request.]
As always, thank you all for your help.
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