marshallr5

I have a .21 vzb with the black block that when i stop and let it idle will hold a high idle and sounds lean but after a few seconds it idles down and no longer sounds lean. I have reset the needles to factory setting and started over and made no difference. I then checked motor, carb, tank, and lines none had an air leak. I am stumped any help would be appreciated.

Khanuen

I had a problem like that and it turned out to be a loose cooling head screw. I'd keep looking for a leak. Another guy on the forum had completely ruled out a leak and had some kind of problem with his clutch(maybe stuck bearing or something) so the clutch wouldn't disengage. That could keep the revs high for a while too.

Rsickles

iTrader: (21)

Mine had similar issue... o-rings on the mid wore and mid needle wandered off flush. O-ring on back plate is also really thin and wouldn't seal as well as it should.

psr

lean the bottom end i hour at a time till.it idles high constantly then adjust your idle out but you need to get your motor and chassie saturated
let me know how you go

marshallr5

thanks for all the ideas. I have gone over the whole buggy again everything looks good. I checked for leaks again by pluging the intake and exahuast ports the dunking under water while i blow into the fuel line i didnt see any leaks. I changed clutch bell bearings and put a new plug in just to rule them out. I havent got a chance to run it yet due to the weather hoppfully i can run later today. Thanks again for the the help.

marshallr5

Thanks for all the help i put new clutch bell bearings in and changed out the glow plug again to a ofna t4 plug and it runs great and all the problems are gone.