no compression rear cylinger with kent cams - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 53 (permalink) Old 03-26-2015, 05:38 PM Thread Starter
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no compression rear cylinger with kent cams

Hey guys...shop says my bike has normal compression with stock cams but 150-160 front and 35 rear with roger ditchfields kent cams, degreed to his specs.

ANY ideas? No valve leaks, rings in ok...I 'm at a loss.

Derrel
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post #2 of 53 (permalink) Old 03-26-2015, 06:32 PM
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Make sure they have the cams synced correctly after swapping them......it been known a time or two for cams to be 180* out of spec when installed.....just for starters
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post #3 of 53 (permalink) Old 03-26-2015, 06:36 PM Thread Starter
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Hard to believe a race team shop can't figure it out...they're degreed to Roger's specs they say.....if they can install stock cams correctly, hard to believe they can't do the same with KC's....especially f to r discrepancy...160 front sounds phat!
Tks bud!
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post #4 of 53 (permalink) Old 03-26-2015, 08:35 PM
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well, like the saying says, happens to the best of us sometimes....I'm just throwing ideas in the hat.....never know
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post #5 of 53 (permalink) Old 03-27-2015, 02:16 AM
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If it is fine with stock cams it can only be one of 3 things
They have not adjusted the valve clearance to suit the kent cams
They are timed incorrectly
they installed the cams incorrectly


http://www.kentcams.com/product-deta...ft/HON21-Race/

Last edited by dansp1; 03-27-2015 at 02:30 AM.
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post #6 of 53 (permalink) Old 03-27-2015, 07:00 AM
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well, like the saying says, happens to the best of us sometimes....I'm just throwing ideas in the hat.....never know
I always listen to certain people with RC-51 expertise........
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post #7 of 53 (permalink) Old 03-27-2015, 09:05 AM
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I wonder the valves have been damaged from incorrect cam timing? If they put back standard cam on the back cyl, does it then give a high reading of compression?

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post #8 of 53 (permalink) Old 03-27-2015, 09:44 AM
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I wonder the valves have been damaged from incorrect cam timing? If they put back standard cam on the back cyl, does it then give a high reading of compression?
I do-not believe these are interference engines.
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post #9 of 53 (permalink) Old 03-27-2015, 10:54 AM
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I do-not believe these are interference engines.
Not the way I understand. In fact most all motorcycle engines are interference design, especially sport bikes.
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post #10 of 53 (permalink) Old 03-27-2015, 11:06 AM
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Not the way I understand. In fact most all motorcycle engines are interference design, especially sport bikes.
There are two reasons I think that.

I saw an RC engine that was 180 out and cranked over then corrected with no damage.

Unlike most sportbikes our have very low c/r's
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