Yes turning it until it stops building. Not blocking the plate open. Can't use a charger when cranking. It blows the fuse. Motor is apart now anyway. The bent valve was on the "good" cylinder.
You will never get accurate compression numbers with the throttle closed, it must be wide open.
When they get it all back together again, have them perform a proper leakdown test, and check each cylinder in at least 3 places (TDC, BDC, midpoint). If you have any variation cylinder to cylinder, they need to address it before you take the bike again. And I noticed you mentioned rings, but nothing about the cylinders. If no one actually checked the cylinders with torque plates and just threw new rings on the pistons, I wouldn't be surprised if you don't have some of those out of round and/or severely tapered cylinders that were pretty common on the early 110's. Maybe they did check them, but at this point it would be a good idea to do it again versus assuming it was done right the last time. After this many attempts, I wouldn't assume anything.
btw, the new heads that were included in the service upgrade program weren't lower compression. The difference was in the valve guides, with the new ones having a groove for a retaining ring, to keep them from being pulled out of the head.
Jerry
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Topic: Low compression (Read 3677 times)