sp2/sp1 stem and triple combo? - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 11 (permalink) Old 04-23-2013, 09:17 PM Thread Starter
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sp2/sp1 stem and triple combo?

I'm in a bit of a dilemma at the moment as I've got a nice set of cnc machined triple clamps on my sp1 parts bike that I would like to use on my sp2.

I have noticed the difference in the diameter of the stems (sp2 is larger than sp1) so the top triple will need to be opened up a bit, but I'm wondering if an sp1 lower triple will fit onto the sp2 stem in the lower position?

Has anybody done something like this in the past? Are there measurements available in a drawing somewhere?
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post #2 of 11 (permalink) Old 04-23-2013, 09:18 PM
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Have you tries www.rc51parts.com Best part if you are in Ontario, Ben is in New York.



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post #3 of 11 (permalink) Old 04-23-2013, 09:49 PM
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A good machinist would be able to swap that out...



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post #4 of 11 (permalink) Old 04-23-2013, 10:56 PM
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The SP2 factory upgrades are for a reason. The bike is better. Whether you can personally tell the difference and need it is another matter. Therefore, the decision is yours.

Personally, SP2 all the way. FTW.
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post #5 of 11 (permalink) Old 04-24-2013, 10:59 AM Thread Starter
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I believe the sp1 stem was steel (smaller diameter) and was reading the sp2 stem was made of Al (and larger in diameter to negate the difference in surface hardness and strength). Any geometry chages are in the angle the stem mounts to the frame at and potentially in the relationship between the stem and fork tube position. If there is a difference I might just sell these triple clamps and figure something else out.
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post #6 of 11 (permalink) Old 04-24-2013, 03:32 PM
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I think Gilles Tooling still make adjustable offset triples for theRC...not cheap but looks like you don't have that problem.

http://www.hardracing.com/GILLESTT.htm



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post #7 of 11 (permalink) Old 04-24-2013, 03:37 PM
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The SP1 stem was smaller at the top than the SP2 stem.
The SP1 uses different bearings top vs bottom.
The SP2 stem uses the same bearings top vs bottom.
The SP1 and SP2 share the same bearing for the bottom of the steering stem (and thus the top of the SP2).

The pressed part of the stem that goes into the lower triple may not have the same diameter on each for OEM parts. So it may not be a straight swap to put an SP2 stem into an SP1 lower clamp. If you have a set of aftermarket clamps, you may be able to just call the company that made them and ask them if the stems are swappable (would make sense if they are, since that means the lowers are the same). They might even sell you a new one to make it easy on you.

***I have heard*** somewhere that swapping the triple clamps from SP1 to SP2 is as simple and changing out the upper bearing, in that the upper bearing outer race is the same diameter on both bikes. No idea if this is true though.


Oh, and the SP2 stem is definitely not aluminum.




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post #8 of 11 (permalink) Old 04-24-2013, 03:41 PM
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Quote:
Originally Posted by nobody View Post
I think Gilles Tooling still make adjustable offset triples for theRC...not cheap but looks like you don't have that problem.

http://www.hardracing.com/GILLESTT.htm
Sorry, but gillies shit looks like, well... shit.

I much prefer Attack racing:
http://shop.attackperformance.com/Ca...:Complete+kits


And check out this little nugget. They sell replacement parts, and the lower is the same for all years, and the SP1 and SP2 have different stems:
http://shop.attackperformance.com/Ca...lacement+Parts




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post #9 of 11 (permalink) Old 04-24-2013, 03:44 PM
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No worries miller...I just always connect Attack with Yamaha.

Ya those are sweet and cheaper too...hmmm



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post #10 of 11 (permalink) Old 04-24-2013, 03:59 PM Thread Starter
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Quote:
Originally Posted by b.miller123 View Post
The SP1 stem was smaller at the top than the SP2 stem.
The SP1 uses different bearings top vs bottom.
The SP2 stem uses the same bearings top vs bottom.
The SP1 and SP2 share the same bearing for the bottom of the steering stem (and thus the top of the SP2).

The pressed part of the stem that goes into the lower triple may not have the same diameter on each for OEM parts. So it may not be a straight swap to put an SP2 stem into an SP1 lower clamp. If you have a set of aftermarket clamps, you may be able to just call the company that made them and ask them if the stems are swappable (would make sense if they are, since that means the lowers are the same). They might even sell you a new one to make it easy on you.

***I have heard*** somewhere that swapping the triple clamps from SP1 to SP2 is as simple and changing out the upper bearing, in that the upper bearing outer race is the same diameter on both bikes. No idea if this is true though.


Oh, and the SP2 stem is definitely not aluminum.
Thanks for the info, much apprecaited. I hadn't looked at the stems myself (stored 40kms away). The clamps were made by a cnc instructor I had years ago, so thats not an option unfortunately. I'll remove them when I'm on days off and see how different they are.
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