Super Tigre ST 3000 Gas Conversion
Hi everybody.Today I started my converted ST 3000 equiped with Walbro 28 size WA99B (Stihl Chainsaw) ,RCEXL ignition,rimfire spark plug.Oil to Gas ratio 12:1,temperature outside 5 celsius.
With Menz 19X8 7200 rpm,18X10 7450 rpm,canister muffler,about 200cc volume,12mm exhaust diameter.
My questions to you all my friends:
I can hold a steady 1600 rpm idle,but after a prolonged WOT engine stops.If I set idle to 2000 rpm,no more problems.Any Fixes?
After 4 hours of running at various rpm,I inspected inside the engine,it is shiny clean and no traces of anything.VERY oily everything.Can I lower the oil content to about 16:1 ?Oil used is common chain saw type,nothing expensive synth oil.
I did following modifications:On upper side of connecting rod i made 2 more oil holes 1.2mm diameter 30 degrees left and right of existing one,on big end I made 4 holes 1,2mm spaced equally left and right of existing hole.Advance timing is critical:32 degrees.3-4 degrees more or less are very significant in top end rpm gain or loss.
I forgot,the engine is old and used,but still good compression.