Join Date: Mar 2009
Location: Monrovia, Maryland, USA
Model: GL1800, GL1000
So the engine-- this is confusing me, so any opinions are welcome. IF I don't think the engine is worth repairing, I will probably part the bike out and find another. I can't see finding an engine that's worth fixing nearby and I can't imagine buying one sight unseen.
Ok, I checked the compression, 75psi on all cylinders, what! That's just too low and too consistently low. So I checked the cam belt, and it was ok, I adjusted the valve lash, they were all to tight. I fixed it, and the compression went up to 85 psi for all the cylinders. Still to low, and too constant, I am thinking there must be something mechanically wrong, not just a tired engine.
I started tearing down the engine today, and the mystery continues. Took the heads off, found the oil leak. Someone was inside the engine before me. The head gasket on the left side was on inside out. That means it didn't seal the oil passage? On the bottom of the head (the port at the top of the picture below, house shaped passage). The right side head gasket looked original, so whoever was in there was changing a blown head Gasket? I will probably never know
So I put the heads on my bench combustion chamber up and filled them with alcohol. They have been sitting there for hour, no leaks through the valves. I was sure I would find some bent valves, but no
Inspected all the bores, No deep scratches, no ridge at all and I can even see remnants of cross hatching. I measured the bores and they are all 71.9x mm. I think that means the engine has not been bored
So at this point I am thinking my compression gauge is broken. The internals of this engine look really good
So what are your thoughts. Should I spend some money on this engine and bring it to a machine shop to check?