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Post by raychappo on Jul 14, 2015 14:49:42 GMT -5
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.
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Post by Jess on Jul 14, 2015 17:06:09 GMT -5
Ray,
They will start and run at 60 PSI which is a testament to the design and durability. Max compression for one should be 138 at sea level, so you are down by almost 50%
However, you are correct... time for some work.
Good luck, have fun!
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Post by raychappo on Aug 6, 2015 12:58:06 GMT -5
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.
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Post by raychappo on Mar 16, 2016 15:59:04 GMT -5
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 ?
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Post by jm0406 on Mar 16, 2016 17:26:26 GMT -5
I know the feeling, glad you got it back under you. Jeff
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Post by goandy on Mar 17, 2016 0:33:03 GMT -5
Nice one, well done!
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Post by timpa136 on Mar 17, 2016 9:41:53 GMT -5
Such a great feeling to hear her purring again ? Great to hear that.
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Post by HGH 770N on Mar 23, 2016 8:40:06 GMT -5
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
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Post by raychappo on Mar 23, 2016 17:27:41 GMT -5
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.
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Post by jm0406 on Mar 23, 2016 18:59:40 GMT -5
Sounds like Jess sent you an excellent unit. Some of them only got to 130 lbs new. Jeff
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Post by raychappo on Mar 24, 2016 1:33:04 GMT -5
I know, very pleased at the moment. Although the test was with well oiled chambers
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