Not sure about the engine size. It says corsa on the block and has the number 17 stamped on the carb so im guessing its a 17 engine? To be honest i dont think it is the right engine for the car. As for compression it feels like it hasnt even been broken in as ive broken a brand new pull start and snapped the cord loads of times. Is the high speed needle the one where the fuel pipe goes to the carb? Ive stripped the engine down today and used some sealant on the exhaust manifold and the pull start backing plate and it starts easier now but as soon as the glow start comes off it borks out. I,ll try tuning it again when i buy some more fuel.i was using 20% in it. Would 16% be better? Cheers for the replys.