This Hi- Rev 2 Stroke Is Very Touchy. They Are Not Happy With Ethanol Fuel. Use 93 Octane Fuel With 3 OZ. Of Synthetic 2-Stroke Oil To 1 GAL. Of Fuel. Lightly Seat Air Screw On Carb And Turn (CCW) 1 1/2 Turns. (CCW) Is Rich.(CW)is Lean. Never Run Less Than 1 Turn On This Screw. Make Sure Reeds Are Good. Bad Or Broken Reed Will Run Way Rich. A Quick Way To Check Reeds Is To Remove The Rubber Duct From The Air Box At The Carb. Exposing The Throat Of The Carb. Run At High Idle(1500 RPM) Noticeable Blow-Back (OILY-FUEL) Is An Indication Of A Bad Reed. Make Sure Coolant Is Correct Also. Try Running Correct AUTO-LITE Spark Plug Or Iridium NGK. If You Replace Reeds Use 2-Stage Carbon-Fiber Reeds
Black dry deposits are indicitive of a very rich mixture. On your two stroke, rich is a asset but you can go too rich. It sounds like for some reason you're getting too much fuel.
I think I ran into something like this before on a Kawasaki 80. Check the screws that holds the choke plate inside the carb. They will come loose and allow the choke to close on you while riding the bike. If the screw comes out, it will go into the engine and cause serious damage. If the screws are loose, them out one at a time and put a drop of Loctite 271 (red) on them and reinstall them.
Check the float and the needle and seat to make sure that you don't have any trash in the needle and seat. Also check your tank vent. If the tank builds up vacuum, you could be running out of fuel. Sounds funny that you can be running rich but run out of fuel. The problem is that you run out of fuel so quickly that the carbon from the rich mixture doesn't have time to burn off.
Good Luck
Steve
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