Compression fail. found reason

[s.varty]

Cutting some logs the other day and my 044 suddenly stopped, no compression what so ever, first thought was a holed piston. I took the top cover off and found that there is 2 plug holes in the cylinder head one for the spark plug and the other is blocked with a small bolt, the small bolt had unthreaded its self, screwed it back in and off it went again. Does any one else know about the second threaded hole and whats it for? my guess is for a decompressor??

[swinny]

Correct for a de compressor button

[Cut4fun]

Yep. The decomp plug should have a small washer on it to help stop vibrating out like that.

 

Otherwise you could add the decomp button back to saw if needed and you have hole in top cover.

 

Pic http://www.hlsproparts.com/Decompression-plug-for-chainsaw-cut-off-saw-p/t635701.htm?Click=2142&utm_source=ShopzillaPLA&utm_Medium=CSE&utm_term=T635701

[s.varty]

cheers lads great help mine is missing the copper washer which explains why it comes loose.

[wisecobandit]

Its obviously an aftermarket cylinder but that does mean its a 12mm piston pin over the 10mm so more availability.

I would fit a decomp anyway looking how bad a fit the plug is. Someones had to cut a slot just to screw it in with a screwdriver which means it will prob undo again. A decomp is only a 13mm socket and would prob fit under the standard cover and you could just forget about it.If you wanted to use it you could prob drill a hole in the top cover and fit a grommet to make if look factory.