I can't get my engine to rev. It has plenty of compression (85-90PSI), new points and plug (all gapped and set to spec), a clean carbie with new gaskets (3L carby), float level set according to specs, needle and seat are fine. I've put 2 new condensers in, the first allowed it to rev till the over long lead vibrated out of where I'd poked it, hit the spinning flywheel, bared the wire and blew the condenser, plus, back fired through the carbie and blew he top off the air cleaner (something I'll never be able to replace, it was the original red mesh filtration system. My other thread have pictures). That was a $30 condenser from the local mower shop, lasted 2 minutes. I've now replaced that, I got 5 from ebay for $10.
My exhaust pipe doesn't appear to be blocked though reading elsewhere members say they blow/ spray brake clean through and tap it to loosen carbon then blow it out with air compressor. I have all the necessary equipment.
Another mention is carbon build up on the exhaust port, that appears to be clean. I've had the muffler off and saw little to no carbon build up.
I'm running on standard 25:1 mix I do myself and the fuel is fresh and clean, as are the lines and fuel filter.
I'm at wits end, I have no other ideas and I've been fixing 2 stroke engines and building them for 40+ years (mowers and motorbikes). Usually, I'd go with a blocked muffler and that's about the last port of call later today if it doesn't rain.
Any other ideas?
Crank seals don't leak as is evident by compression readings (plus, absolutely no signs of leakage anywhere on mower).
I need to get my lawn done and spent 1.5 hours yesterday in extreme heat doing the smallest patch of my front lawn (20 minutes worth of mowing under standard, running conditions). It had gotten thick and the mower stalls in long grass even set high.
