Compression Question????

[gofastsandman]

Yea...Unfortunately

80 psi: note verticle grooves:



Pull piston: note stuck ring and more vert damage


120 psi: Cy; deglazed with hone 90% of vert grooves gone, cross hatch re-established, comp back up to 120, motor is happy again. Thes pix were about 3/4 thru...it looked a bit better when cleaned. I put in a new cly and ring kit. Rod and needle bearings too.





It dosnt make me feel good that I had to perform surgery but like Tim has said these motors are tough and basic and it didnt seem to mind the work. My motor was a nice clean motor that I aquired for cheap money before I gooned it up. I hope to get a few seaons from it still.

Now the class has my attention.
When I talked to Art @BRP tech he said that these motors left the factory at spec between 90 and 130 comp. I thought that to be strange. He said that as long as they were even that was proper spec for release.Said they matched the piston/ ring combos. My motor is 87-92 and turns 5200 light Bimini up. Should I be concerned? Anyone local have a scope?

Decarbed 30 hrs ago w/ Engine tuner thru the Schrader and then pony tank Seafoam 3 cycles. `til the forest fire smoke stopped. 930 hrs now."Pros" all say don`t worry, but I am. Always.
Thx,
GFS