Re: Honda CB750 (and CB450) Compression Test Results

Posted by 750K8 on Feb 21, 2013; 4:04pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Honda-CB750-and-CB450-Compression-Test-Results-tp4036911p4036932.html

When my father comes up (this guy: http://honda-cb750-s.456789.n3.nabble.com/MY-1979-CB750-DOHC-BUILD-td4035619.html) to visit for spring break, then I may have him take the CB450 engine back home with him and do a rebuild since he's more experienced with DOHCs than I am (even though the CB750 and CB450 DOHCs are different motors) while I drive the CB750 and enjoy it.

The CB450 is still awaiting a brand new petcock, and then I'm going to run it some more and perform some more tuning, get it hot, and re-run a compression test. If the compression is still low (which I would guess it would still be), then I'd go ahead and begin tearing the engine out for him to bring back with him...only because I have another CB to drive. Still plenty to do on the CB450 without the engine being here, too!

As far as the CB750, it really runs fine, so I'm really not worried about the compression numbers. Plus, those spark plugs are not the easiest to get out, especially with a hot motor, and I don't plan on turning it on to get it hot for probably another few weeks because it's undergoing paint work. The plan is to just drive and enjoy it. When the CB450 is rebuilt and is ready to be a main driver, then It would be time to tear down the CB750.

Sounds like a good plan to me!