Login  Register

Re: Compression Test

Posted by LukeM on Oct 31, 2012; 3:27pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Compression-Test-tp4031442p4031487.html

In my humble opinion, those numbers don't look bad.  Depending on the viscosity of the oil used (thicker oil = better seal rings to cylinder), that's not a bad jump from dry to wet.

I would assume this engine has some miles on it.  If you see blue smoke from the exhaust when accelerating hard, it's possible some oil is leaking past the rings. It's also possible there's some oil sneaking past the valve guides. Do you notice a drop in oil level, and if so, how often do you add more oil: every 200 miles?  every 1000?  You can also check the spark plugs, and get a good read of what's going on in the combustion process.

If it were me, I'd just keep riding it, and when the oil consumption got really bad, tear it down for a proper rebuild (bearings, rings, gaskets, etc).  The top end doesn't sound like it's doing too bad.

Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.