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Old 06-25-2010, 11:16 AM
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Incubus Incubus is offline
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I remember now why I started hating on Succubus....

I parked Succubus, my original '79 Standard, two years ago. It was a real problem child. Ran like the wind, would not idle on No. 1. I have eight running motorcycles. I figured I would get back to it whenever I stumbled upon a Round Tuit.

Well, I found one and went back to look at it. I tested the compression today and I am a bit perplexed. The bike has new rings with like, maybe, 300 miles on them. These are one step OS rings filed down to fit a stock cylinder. Before I parked the bike (ok, it was more of an on-site banishment) I tested the compression. I don't remember the numbers exactly, but I remember I had good, equivalent compression on 2,3 and 4 - seems like it was around 145-150 - but low compression on No. 1 - like maybe 100. That seemed like the reason I couldn't get No. 1 to fire at idle and I didn't feel like tearing down the top end again.

I checked the compression this morning, during a brief hiatus while my starter button actually worked. Now I have little to no compression on No. 3, low compression on No. 4 (about 75) good compression on No. 2 (about 150). No. 1, however, has enjoyed a renaissance. The compression is really, really high - like about 180.

I can explain, in my own mind, why compression would drop after a long layoff. I'm figuring stuck rings. Can anyone explain, though, why No. 1 compression is suddenly so high?

I still don't want to tear down the top end without cause.

Patrick
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Last edited by Incubus; 06-25-2010 at 11:18 AM.
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Old 06-25-2010, 04:39 PM
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GARTHXS GARTHXS is offline
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Try a little marvel mystery oil in each cylinder spin the motor with the kicker. Slap on a known good set of carbs and fire her up. These bike like to be ridden hard or they give you attitude. Show her who is the boss
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Old 06-25-2010, 06:53 PM
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jwhughes3 jwhughes3 is offline
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Rings maybe not seated before

When you checked compression after rebuild maybe the rings hadn't seated yet. I really think it would take more than 300 miles to properly break in so I am just guessing.

I would second Garths idea of MMO up top in any engine that's been sitting.

Hope you find the answer.

John
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Old 06-26-2010, 12:21 AM
tadtl1 tadtl1 is offline
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are you sure that gauge is working right?

are you sure that gauge is working right? I had a vacuum gauge go south on me and practically drive me up a wall, whatever you need to do to doublecheck the gauge, try that.
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