Announcement

**Anonymous** · 05-12-2005, 05:59 PM

Compression should be 130-160 psi according to Clymer but it also says that the engine should start with compression as low as 100.

**duaneage** · 05-12-2005, 09:44 PM

It is just as important for them to be equal. If one is low the engine will not idle properly and be hard to tune.

**ptm** · 05-13-2005, 12:22 AM

Originally posted by duaneage

It is just as important for them to be equal. If one is low the engine will not idle properly and be hard to tune.

There should be no more than 25-30 psi difference between the highest and lowest - less is better.

Compression on gs650