The enrichment knob is named correctly.  At a first click position you have added a very minor amount of fuel continuously to your fuel flow.

PhantomII wrote on 07/30/13 at 07:05:09:


Your bike may not be running lean.....it might be running well.  When you close the throttle the fuel supply through the needle jet and main jet is shut off, and only the pilot jet can supply fuel in this scenario.  The mixture does go lean - but by increasing the size of the pilot jet or opening up the mixture screw you are making the engine run rich during acceleration or steady cruise - in an attempt to supply some additional fuel when you close off the throttle.

If your bike runs with the enrichment knob out when the bike is warm, that does indicate that something is wrong.  Your enrichment circuit could be plugged, your idle speed could be too high, your float level too low.  I am not sure what tach you are using to check your idle speed, and if you can move the idle mixture screw in and out without affecting the idle mixture, and the fuel enrichment knob does not affect the idle....it makes me think that the throttle butterfly is open too far and the bike is idling too fast.  Go to YouTube and check the 500 bpm (beat per minute) metronome and see if that is what your bike sounds like at idle.        

The tiny tac should work fine...as long as you have it set for the fact that the ignition sparks every revolution.  Since there is not any distributor to limit the spark to once every two revolutions.  If you have your Tiny Tach set for a 4 stroke that fires once every two revolutions....you may have the idle speed set at 2,000 rpm instead of 1,000 rpm.

Dave I think I figured it out I think my tach is reading too low I just looked up a gearing chart and according to the chart my bike should be running at around 4000 rpms at 60 mph but on my tach it is only reading 2000.  I just went out and readjusted the idle to 550 rpm's and I was able to make good adjustments to the mixture screw and the bike no longer pops when I shut it off, I was unable to drive it very far or get it up to speed because I'm at work but I will let you know when I get home tonight how it did.