I rebuilt the top end last year and it was fine.When was the last time the topend was rebuilt? Since you have the head off, what do the cylinder walls look like?
What elevation are you at ?
27 m
And now its not. Only so many options here.I rebuilt the top end last year and it was fine.
What do you mean by the sleeves dropped? how can that happend?Have the top of the cylinder milled or surfaced. I bet its warped or the sleeves have dropped a little.
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I tried but still the same. Am concerning the head bolts torque and the two damaged threades.Maybe try your stock head then test the compression. If it's still low, it's time to check your rings.
Actually it is a 760 cylinder and cases.
Judging by the photos, you have 701 cases with a 701 62T cylinder that has been bored to 85mm.
The base gasket is there but I took it out with the cylinder.Where is your cylinder base gasket? Pictures look like none was used... Something isn't right for your compression to be that low. Can you feel the scratches in your cylinders with a fingernail?
Also, when you're checking compression do you have the throttle pulled wide open?
I agree. Definately 62t/701 cases becuase of the single pulse. Cylinder looks like 62t 701 as well but a little hard to tell from the pics.
Do you mean that I have to take out the sleeves and put new ones??62t 701, you can see the sleeves.
My advice to the owner but who really cares; ditch that over bored worn out cylinder and pistons.