[bwarren]

Having a LOT of trouble to get my NSR50 to idle. Killing me!! I completely took the carb apart and soaked everything (that wasn't rubber or plastic) in gunk commercial heavy duty carb cleaner (comes in a gallon pail with a strainer for the parts to sit in). Put everything together, put in a new plug, bike started hard, and I had to keep blipping it to keep it running. I thought I was out of the woods when I found a couple of vacuum leaks - spraying carb cleaner around the area (intake and around reed valve gaskets) would cause the engine to rev up - all good. I made a couple of new gaskets and added some gasket sealant. NOT so fast . . . it ran better, but still won't idle!! wtf! I've had the air screw turned all the way in (as rich as I can get it) and I still have to blip the throttle to keep it running. NO IDEA what the Throttle Stop Screw is suppose to do yet. SOMEBODY help me! Guessing someone here along the way has been there and done that.

 

[bwarren]

Figured it out!!! Looked through another thread which had a link detailing "carb tuning." Through reading that and the cool little graphic I figured out that SOMETHING was wrong with my idle circuit (coupled with the fact that the air screw did nothing no mater where I set it, and the bike had been sitting for over a year before I got it). Sure enough the orifice in the slow jet was blocked!! Embarassingly, I didn't know that you should be able to see light through it (now I know ). I dug at it with a smaller jeweler's screw driver, a wire cleaner for tips on my oxy-acetylene torches . . . and after about 45 minutes there was LIGHT at the end of the tunnel. I put everything back together, and I now have an idle circuit. COOL! Oh yeah, through the process I figured out what the Throttle Stop Screw does (not much if you don't have an idle circuit) -now I can actually set the idle RPMs. Hope this helps someone else along the way . . .

 

[PocketBikeRacingTsmmr]

Glad to hear you got this sorted out .