Swap an SP1 for an SP2 - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 4 (permalink) Old 06-09-2014, 07:23 AM Thread Starter
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Swap an SP1 for an SP2

Considering swapping engines in the RC51. Currently has the original motor and is smoking worse than a two stroke. Compression is good (haven't done a good leak down test) and installed new valve seals. Still burning oil at a far more than acceptable rate.

So I'm looking at swapping the motor out and playing with the other one on the bench. What is involved with changing to an SP2 engine? My concern is with the engine management.

Thanks,

Sean
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post #2 of 4 (permalink) Old 06-09-2014, 09:56 AM
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biggest difference is the exhaust ports (headers), and i think the intake side is larger too due to the larger throttle bodies
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post #3 of 4 (permalink) Old 06-09-2014, 04:47 PM Thread Starter
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good to know, thanks.

Sean
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post #4 of 4 (permalink) Old 06-09-2014, 05:39 PM
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No difference in the intake runners between the two.
The SP1 throttle body isolators will fit.
The exhaust ports on an SP2 are D-shaped, but the SP1 headers should bolt on.
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