AHRMA next gen superbike 2 build - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 15 (permalink) Old 12-15-2017, 04:44 PM Thread Starter
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AHRMA next gen superbike 2 build

Hey guys,
Wanted to give a quick introduction to my project. AHRMA recently released the rules for next gen superbike 2 and lists the RC51 SP1 as being eligible. I was able to find a base for my project/build about an hour away. It doesn't look like much, but for the titled frame, motor, swingarm, forks and rear wheel, I was able to snag it for $200. The plan is to mock the bike up/rolling before breaking it apart to rebuild components. Here is a preliminary list of the main upgrades I plan on carrying out:

- front forks rebuilt with GP 25mm cartridge kit
- ohlins rear from Kyle racing
- front mount radiators
- HRC style exhaust or a custom one from local fab shop.

Hope to have more updates in the next couple of weeks after I organize the garage and make a work space for it. Thanks guys and look forward to any insight.


Will look into the SP2 swingarm. Just want to double check to see if it is legal.
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post #2 of 15 (permalink) Old 12-16-2017, 04:36 AM
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sp2 swingarm has to be legal its the race version off the sp1
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post #3 of 15 (permalink) Old 12-16-2017, 12:02 PM
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Rules say kit swingarms are allowed. So as long as they don't get picky on literally needing a kit part #'d swingarm the SP2 swingarm should work.

The SP1 was a bear at the limit on the track. The SP2 frame changes really helped that. Just wanted to mention it. The rules only approve the SP1 though...


Any reasons for going with the GP 25mm cartridge kit? I haven't found an RC51 fitment but haven't deep dived. Most here like the various Ohlins or AK options.

Sound like great fun. GL, cheers and by all means post your build and track progress as it goes!

Last edited by kwtoxman; 12-16-2017 at 12:11 PM.
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post #4 of 15 (permalink) Old 12-16-2017, 01:18 PM
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Interesting project jsedacca.. looking forward to seeing the build

So any 2000-2001 may race in the class but not 2002 -2006? that will exclude most RC51 owners including myself
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post #5 of 15 (permalink) Old 12-16-2017, 02:33 PM Thread Starter
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Originally Posted by kwtoxman View Post
Rules say kit swingarms are allowed. So as long as they don't get picky on literally needing a kit part #'d swingarm the SP2 swingarm should work.

The SP1 was a bear at the limit on the track. The SP2 frame changes really helped that. Just wanted to mention it. The rules only approve the SP1 though...
Any reasons for going with the GP 25mm cartridge kit? I haven't found an RC51 fitment but haven't deep dived. Most here like the various Ohlins or AK options.

Sound like great fun. GL, cheers and by all means post your build and track progress as it goes!
I would also think the SP2 swingarm would be fully legal, but will double check just to be sure. Last thing I'd want is to build a bike and have illegal parts. The rules are kind of vague but like any rules , if it says you cannot do it, you usually can't.

I had the GP 25mm kit on my 07 R6 track bike 4 years ago and loved them. Just looking into different options. They do not list a kit on their site, but I contacted them and they just need the forks to fit a kit. Price they quoted was $1400 installed.
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post #6 of 15 (permalink) Old 12-16-2017, 02:34 PM Thread Starter
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Interesting project jsedacca.. looking forward to seeing the build

So any 2000-2001 may race in the class but not 2002 -2006? that will exclude most RC51 owners including myself
That's correct. I emailed the rules committee and they confirmed SP1 only due to the years it raced against the 4 cyl 750s and Ducati 996s. I agree it rules out a lot of RC51 owners. Yet they allow Ducati 851/888 with 996 engine swaps.
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post #7 of 15 (permalink) Old 12-16-2017, 03:27 PM
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Thx. FWIW to the rules committee, the SP2 raced against 4 cylinder 750's and other twins in 2002 as well; the same format and class as the SP1 did in 2000 and 2001. 2002 was the last year of that race format before changing to 4 cylinder litre bikes. And it won the 2002 AMA superbike championship title (with NH aboard) and the 2002 WSB championship title (with CEII aboard).

Cheers!

Last edited by kwtoxman; 12-16-2017 at 03:30 PM.
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post #8 of 15 (permalink) Old 12-20-2017, 12:18 PM Thread Starter
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Thx. FWIW to the rules committee, the SP2 raced against 4 cylinder 750's and other twins in 2002 as well; the same format and class as the SP1 did in 2000 and 2001. 2002 was the last year of that race format before changing to 4 cylinder litre bikes. And it won the 2002 AMA superbike championship title (with NH aboard) and the 2002 WSB championship title (with CEII aboard).

Cheers!
I've brought it up to the rules committee when I first inquired and for whatever reason, the SP1 is the only model eligible. The rules are pretty open so it seems the sp2 swinger, throttle bodies etc can be used. The shortcomings of the SP1 can be overcome. Not too much progress but I got the garage organized a bit and built a work platform for the bike. Got it up on stands and the forks mounted with the rear wheel. Got more parts coming in for mockup and will update when they get here.
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post #9 of 15 (permalink) Old 12-20-2017, 09:31 PM
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Looking forward to this build too...

2004 BMW R1150SR Project Touring Bike (in-work)
2005 Honda RC-51 SP-2 - future track tool
2014 Ducati HyperProject (Hyperstrada)
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post #10 of 15 (permalink) Old 12-22-2017, 10:20 AM Thread Starter
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Still waiting for a bunch of parts to come in. Was scouring eBay last night and came across a SP2 swingarm. I have a tank, front calipers and sp2 swinger coming in. Everything should be in just after Christmas. Still looking for a front wheel/rotors. Stay tuned in the next week for updates as parts arrive.

Last edited by jsedacca; 02-05-2018 at 01:25 PM.
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