I have a 85 Spree (2 stroke). I've religiously followed all advice on this forum, including the big one from start to finish on how to get it to run..........but the problem still persists. I've rebuilt the engine, cleaned the carb, changed the plug many times, changed the gas, filter, ad nauseum.
Problem........she runs fine about 90% of the time, gets up to 35mph (in a tailwind). Just as I get up to top speed, the engine suddenly dies....the scooter slows down to exactly 17mph, then.....engine springs back to life. Back up to 30mph then 20-30 secs later same thing. What gives? Is it suddenly losing fuel? or is there a loose ignition coil, It seems speed related, ie. it always happens at the same speed, and sometimes I can drive around for half and hour without incident. It seems to happen more frequently though in the first 20 minutes the engine is running, Also when just starting up and starting off, the engine is a bit rough running, when you accelerate it misses and dies, but picks up again quickly.
Any assistance would be greatly appreciated........thanks.