We got the Briggs and Stratton 4 strokers running on MEK paint thinner at school, they took a fair bit of punishment with a good advance (adjusting the magneto on the fly), .5mm spark gap, drilled carb and straight thru exhaust. Ah the flames. I shudder to think of the brain damage I caused myself. SQUIRREL!!
I just buried my last 2 smoke. Victa Mustang 160cc. 28 years old, one rebuild. Finally put its leg out of bed and I got lazy. Only $50 for a full reco kit, but the $500 190cc 4 smoke Victa did call to me.
I have to admit farting in its general direction causing it to start was a plus vs. the cursing and sore arm of the Mustang.