my float is plastic,, no adjustment... if I open my drain screw, it will definatly run out faster than it could use it.. so plenty is getting to the bowl... and usually if its ignition related,,, i should hear some form of misfire or something... this thing runs like a top!.... i have had some issues with my starter valve hanging up... but while i was cleaning the carb,, i sprayed it also, (the valve and the bore) now it works as should...what a puzzle aye?... air, fire, fuel.. ... i know im getting air.... i know im getting fuel to the bowl... clean carb, jets all are open... could a rev limiter malfunction and cause total shutdown of the spark?.. im yet to use the timing light to see if its still has fire when it shuts off... sure im not the first one this has happend to... hope someone could give definite answer...i will be sure to post update if I find it...