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Hi all, this unit has only been used twice since new. A mate has dropped it over for me to try and crack it. Problem being it won't start, or even give a cough or fire at all. After checking the usual things with a small 4 stroke, such as does it have spark/ fuel / compression etc? which it has all of those things, yet won't even fire once with a squirt of aerostart down the plug hole, and a little on the plug tip. I would have thought that with all of the above, it should at least show some sign of life. Any ideas on this one would be great, as it has me totally done at the moment. The machine still appears new, not a dirt spot on it.

Check the flywheel key.
Check for a stuck valve
Check the muffler for blockages

Fuel, spark, compression, timing and it will run, I have never came across a engine the didn't. You didn't say how you made these test?

Thanks for the help, will check the muffler today. Has a hornet nest in a muffler on an auger one time, and it had the same result. Will advise.

Removed vacuum operated fuel pump and blew it out, started after that. Still unwise why it wouldn't fire at least once with the aerostart injected into the cylinder.