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smokindawg · 11-18-2015, 04:32 PM

When you did the rebuild did you check that the cylinder was round and in spec? Or did you have it bored?

Did you replace the pistons and rings during the rebuild or just rings? If it were me (Since you've checked all the other things) I'd do a leak down test and see what you get. You may have an engine with an out of round cylinder, or may have accidentally damaged a ring on install.

A compression test is ok but it won't tell you the same thing about the engine as the leak down test will. Plus if you do have excessive leak down you can then tell if it's past a valve or the rings.

11-18-2015, 04:32 PM	#10
smokindawg Gone Wild Join Date: Sep 2012 Location: Missouri Posts: 2,755	Re: Yamaha G2 Blow By When you did the rebuild did you check that the cylinder was round and in spec? Or did you have it bored? Did you replace the pistons and rings during the rebuild or just rings? If it were me (Since you've checked all the other things) I'd do a leak down test and see what you get. You may have an engine with an out of round cylinder, or may have accidentally damaged a ring on install. A compression test is ok but it won't tell you the same thing about the engine as the leak down test will. Plus if you do have excessive leak down you can then tell if it's past a valve or the rings.