I've just ran a compression test using my new compression tester on an old motor I've had hanging around for a few years and I think it's fair to say it's a candidate for a rebuild. At about 70psi it's rather low. I was going to add a pic of the printout but the forum has exceeded its space limit for attachments apparently.
Last Edit: Jul 14, 2015 14:57:04 GMT -5 by raychappo
Bike almost rebuilt after the blow up. I ran a quick compression test on the new/used proper unit before I go for the start, only got about 90psi. I hope it improves after starting and running for a while.
Started the RE for the first time today with the replacement motor after the original one blew up dramatically a year ago. I've spent a few days trying to get it started. It would fire occasionally on the starter but never actually run. Changed fuel for fresh, no luck. Checked carb, no luck. Checked timing, all seemed correct but still no start. Then as a last resort I thought I'd change back to the original ignition system after installing a new electronic setup whilst rebuilding bike. Success!! Started on first jab of the starter. Runs well. Also checked oil pressure with service tool and all looks good. Now need to take it out on a run. Hopefully it will be my bike for the TT again this year. I'll look at the electronic ignition another day, I can't see any reason that I can't get the bike to run with it, but will run with points and CDI for now. Such a great feeling to hear her purring again ?
Well done Ray. Hope to see you at Stafford show . You may be pleasantly surprised after a run and retest to see the compression rise, I had one eventually start up and run on very low compression (65psi) and then rise to 95psi after a static run for a while . BEST Roger
Now Bikes RE 5 M,(UK )Blue 1974 RE 5 M (UK) X 6 H/D XR1200 X1 Sports RE 5 A (UK) Black 1976 Norton Rotary Classic 1988, Norton IP2 1986
Compression test on the replacement motor i bought from Jess before I'd started it for the first time read 130psi which is pretty good, I expect after a a few runs when it's warm it may be even better. It's almost as good as a new motor I believe.