Re: Honda CB750 (and CB450) Compression Test Results

Posted by 750K8 on Feb 21, 2013; 3:03pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Honda-CB750-and-CB450-Compression-Test-Results-tp4036911p4036929.html

Thanks Tools. I was definitely thinking about leaving the CB750 alone anyhow: I'm just finishing up the paint work and really want to get out driving it. Probably will rebuild it either this winter or next winter, as long as the CB450 is ready for me to drive while I do it.

As for the CB450, I do plan on redoing the compression test (both dry and wet). after I get some miles on it. I've heard that if a motorcycle has been sitting for some time, then the compression will continue to open up after some miles have been put on it. I've put about 2 miles on it since I've purchased it, and have ran it off and on for about 3 days.

I did do a dry test for the CB450, but I wasn't used to the tool I was using (nor was I doing wide open throttle). I definitely want to say that the numbers did not go up more than 10-15 PSI from going dry to wet, if that means much.

I plan on changing the oil in both machines in the next couple days. Don't know when or what is in there.