[JimL]

Part of the idle down problem is possibly due to component quality of these low-cost aftermarket Mikunis. The flat slide can be draggy at high engine vacuum on decel. That could be the reason the stock spring was so stiff. Unfortunately, there was so much spring in the carb that it could not reach full throttle opening!

I plan to take the carb back apart and hand lap the slide to the body with my finest valve grinding compound. I will let you know how it works....too cold in the shop to do anything at this time.

Also, the end of the idle speed adjustment screw may be too small, which tends to "stick" the slide ramp relief. Another job for warmer weather.

JimL