Chainsaw Repair

You need to block both the intake and exhaust ports. A strip of inner tube cut to fit between the muffler and carb bolts. Tighten up the bolts enough to compress the rubber and form a seal. Put 80kPa or around 11.6 psi of pressure in the saw and watch it for 30 seconds, if at the end of 30 seconds the pressure is 60kPa 8.7 psi or above you are good to go. If you cannot get pressure into the saw either your intake and exhaust ports may not be sealed well enough, or there is a huge air leak somewhere. Use some soapy water around the crank seals and cylinder base to find leaks. Also may be leaking air past the crankcase gasket.