Difference in SP1 and SP2 radiators - Honda RC51 Forum : RC51 Motorcycle Forums
 
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post #1 of 7 (permalink) Old 02-20-2012, 12:59 PM Thread Starter
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Difference in SP1 and SP2 radiators

Hi I have a bad leak in my left side radiator on my 01 SP1. I have an oppurtunity to get the left radiator from an 03 SP2 for a great price and while I've heard they're not the same I was wondering just HOW different they are and if I can make the newer radiator work on my '01. Any input would be greatly appreciated! This site has been a life saver so far so heres hoping for continued luck, thanks in advance.
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post #2 of 7 (permalink) Old 02-20-2012, 01:42 PM
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pretty sure the sp1 has a screw in temp censer on them as oppose to the sp2 that uses a fan relay to switch.
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post #3 of 7 (permalink) Old 02-20-2012, 02:49 PM
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yep won't work. like rvt said the fan is operated by a scre in temp snsor whereas the SP2 uses an extra relay in the tail.

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post #4 of 7 (permalink) Old 02-20-2012, 03:04 PM
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If it is cheap enough, you could still buy it and just use the threaded part off your old radiator. Any radiator shop should be able to weld it on there. But that same radiator shop might also be able to fix the leak you currently have. It might be worth checking to see if your radiator is reparable before throwing dollars at the problem.



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post #5 of 7 (permalink) Old 02-20-2012, 04:48 PM Thread Starter
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Thanks for the great info as usual guys! Today I asked around and found a VERY reputable welding shop who specializes in aluminum welding and radiator work 15 minutes from my house. Im going to take them the radiator this week and let them do what they do. Thanks for all the advice and I'll keep it in mind if I do need to replace eventually.
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post #6 of 7 (permalink) Old 02-20-2012, 10:06 PM
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The SP2 radiators have an extra mounting bracket on their upper rear part which mounts on a hole on the frame. The SP1 doesn't have those holes (left and right).
Also, like the guys before said, the SP2's left radiator doesn't have the threaded hole for the fan switch. The fans are engaged directly from the ECM through a relay (same one like the one for the high beam).


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post #7 of 7 (permalink) Old 02-20-2012, 10:18 PM
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Quote:
Originally Posted by b.miller123 View Post
If it is cheap enough, you could still buy it and just use the threaded part off your old radiator. Any radiator shop should be able to weld it on there. But that same radiator shop might also be able to fix the leak you currently have. It might be worth checking to see if your radiator is reparable before throwing dollars at the problem.
That's what I did with mine. It had a puncture in the upper left tank portion which the flange-headed prior owner rigged with JB Weld (FYI it doesn't work with radiators).
I had it welded and pressure tested. No problems since.
And much, much cheaper than even a used radiator.
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