Husky 371xp 135psi-squish is too wide-what to do

[eriklane]

Took the base gasket out to get .044...it's worse with base gasket in...only thing I can do is have the base milled, correct?

With the base gasket in it was about .060...and 135psi...

 

[Chris_In_VT]

Think we need some more details.
Is this OEM parts? Aftermarket piston and cylinder? Did you just rebuild it?

 

[eriklane]

Used saw, OEM jug, just refabbed some parts and ready to run it.

 

[RedFir Down]

Used ring also?
Did you check the ring end gap?

 

[Chris_In_VT]

Used ring also?
Did you check the ring end gap?

I think he's thinking his issue is the large squish measurement.
I don't know what those saws typically had for squish. I do know however, the 371\372 weren't particularly high compression engines to begin with. Both of mine are around 150.
But used piston+ring could be the culprit for low compression.

 

[eriklane]

We're talking squish guys...new rings. With .06, this thing is way out...

 

[RedFir Down]

My apologizes, sorry.

 

[Chris_In_VT]

Ok well back to your original question, milling the base is not the only thing you can do, you could do a popup piston as well.

 

[eriklane]

Where could I get one appropriate and how do I pick the right one?

 

[Four Paws]

Where could I get one appropriate and how do I pick the right one?

Sears

 

[Chris_In_VT]

Where could I get one appropriate and how do I pick the right one?

Beats the heck out of me!
I think most people make them.
I'm not exactly qualified to tell you how either

 

[mdavlee]

If it was mine I'd mill the base down and keep the piston as is. If uou really want more compression then you can have the chamber cut also.

 

[JC360]

I had a j red 2171 a while back that the previous owner had just rebuilt with a AM p\c. Saw ran ok, not great, but ok.
After 6 tanks it was only blowing 130 psi. A squish check showed .066 with base gasket in. I dropped the gasket, got the squish down to .045 and the comp went to 150 psi. Ran much better after that!

 

[nmurph]

Erik, is the cylinder OEM or aftermarket?

 

[eriklane]

already said, OEM.

 

[Jacob J.]

There's several members here that can turn the base down for you.

 

[blsnelling]

.044" without a gasket?!!!

 

[eriklane]

Yep

 

[blsnelling]

I've never seen one with that much squish.

 

[jughead500]

Sasquatch way.Flat glass plate and valve lapping compound