Hi dmitr,
If the engine fires up or and doesn't run, make sure the starter o'ring is fine. Even a tiny leaks on the crankcase is negligible compare to the amount air/fuel drawn into the crankcase during up stroke direction and the engine should run. Assuming the carburetor is working fine with diaphragm, governor vacuum line working properly, best to check the main jet or replace the main jet with a known good one or new one. When main jet is partially blocked, the engine will fires up then dies straight away like fuel starving. Note: 79psi is a good compression.
CM
