After rebuild major oil consumption!!!....

[Faltang1090]

Sorry everyone that replied I haven't even been able to get out to check compression yet let alone anything else. My wife has decided to occupy my time to redo the flooring instead of working on "the bike" so I guess I will riding this fall/winter sometime. Still thanks to everyone that has replied.

[motoman]

Well, crosshatching the cylinder walls is supposed to do the same thing (seating) but I wouldn't want that stuff in the brass crank bearings and everywhere else with soft metal contacts! I'll admit I have never gone that far with a rebuild, but it just seems intuitive.

Rarely when using chrome-moly rings. BTW Skids, it all goes out on exhaust dtroke anyways and is NEVER an issue. Just advice from a long time performance engine builber.

[trbig]

BTW Skids, it all goes out on exhaust (s)troke anyways and is NEVER an issue.

Except what gets by the rings as blow-by and down into your crankcase? I'd definitely change the oil soon after trying that stuff.

With the amount of oil usage, it's not as simple as "Rehoning the cylinders". He would not have great compression numbers if the rings aren't seated, but that amount of oil is getting pumped past the rings because there's a path to do so. Bad ring seating would be getting lots of blow-by and blowing oil out the crankcase vent, not the exhaust. For some reason, large amounts of oil are getting by his bottom oil ring and shooting up through the other two rings on the down stroke. Even if one of the other two rings was bad/cracked leaving too large a gap, if the oil ring was doing it's job, (Wiping the cylinder each stroke with a very thin film of oil) you'd not have all that oil getting by, you'd just have awful compression numbers and a lot of blow-by.

It's really easy to overlap that wavy ring on installation or bend one of the very thin rings that sandwiches it so it can't expand out. This is still my best guess, but I've been wrong lots before. Or hole in piston...

How did you install the cylinders over the pistons? Did you use new or used pistons? New or used rings? Did you check end gaps on the rings when installing?

[skids]

Except what gets by the rings as blow-by and down into your crankcase? I'd definitely change the oil soon after trying that stuff.

With the amount of oil usage, it's not as simple as "Rehoning the cylinders". He would not have great compression numbers if the rings aren't seated, but that amount of oil is getting pumped past the rings because there's a path to do so. Bad ring seating would be getting lots of blow-by and blowing oil out the crankcase vent, not the exhaust.

Those were my thoughts as well, but you articulated them better than I could do.

[ViperRon]

The only other thing I could see loosing a vast amount of oil like that is terribly worn valve guides with cracked off or no seals on them mainly on the exaust side because no plug can burn a quart of oil and still function unless its over a long period of time.