Thread: Rebuild or no?
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Old 11-26-2021, 10:41 AM
Dave Neptune Dave Neptune is offline
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No rebuild yet! A stuck or sticky valve is probably causing the zero cylinder~~no biggie. The low numbers are not that bad and could easily be sticky rings from sitting or the results of a poor test.

I would add some TCW-3 (synthetic 2 stroke oil) or MMO to fresh fuel at around 100:1 mix.

SPRAY some penetrating oil or lubricant of some sort into each cylinder and let it sit for a day or two. Leave the plugs out and kick her over with the starter once in a while to mix and shake thing up.

Check the centrifugal advance for smooth operation, especially since she has been sitting.

After a few days and/or even some trying to loosen the offending valve with an Allen wrench gently.

Now start her up again and let her run for a bit at various RPM's and stay below 2,000. She may just shake the stuck valve loose and the added oil to the fuel will get in a begin lubricating. Once done let her cool for a few hours and do a compression check.

The compression check should be done with the throttle at full, the choke open, all plugs removed and fully charged batteries.
First do the dry test and record the numbers. Now do a wet test by spraying some oil into the cylinders one at a time and conduct the "wet" test again recording the numbers. Get those numbers back to us for further evaluation.

No need to rebuild unless something is broke or a knocking bearing journal.

Dave Neptune
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