Saw compression

[merc_man]

So i got a dumb question. If the mount bolts came loose for a clamshell motor would that cause low compression. 3 bolts loose and one gone. It only had 70psi befor i started tearing it apart. Piston and cylinder look pretty good still.

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[huskihl]

Definitely

 

[merc_man]

Thanks i thought it might

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[Wood Doctor]

Way too much air gets into the combustion chamber. Simple as that. I once ran into this on a Stihl 064. Two bolts were actually missing completely.

 

[old guy]

Comp is made after the piston gets above the exhaust port, how does more air get up there from a loose cyl?
If more air got in there it should increase compression.

 

[huskihl]

If there’s a .050” gap in the bottom cap, the crank is also .050” low. Squish would be like .090”

 

[old guy]

If there’s a .050” gap in the bottom cap, the crank is also .050” low. Squish would be like .090”

There it is!