SP1 vs SP2 - Honda RC51 Forum : RC51 Motorcycle Forums
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post #1 of 15 (permalink) Old 02-19-2008, 03:22 PM Thread Starter
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SP1 vs SP2

Hi, Im thinking about getting an RC51 but I was wondering what the difference is between the early SP1s and the SP2?
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post #2 of 15 (permalink) Old 07-09-2008, 09:07 AM
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My understanding is that suspension and brakes are improved on the SP2 as well as fuel injection. The SP2 uses adjustable Showas front and rear. I don't know about the SP1s.
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post #3 of 15 (permalink) Old 07-09-2008, 02:57 PM
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My understanding is that suspension and brakes are improved on the SP2 as well as fuel injection. The SP2 uses adjustable Showas front and rear. I don't know about the SP1s.
FI, frame, swingarm are the major updates from the Sp1 to Sp2. The suspension on the SP1 is also Showa and fully adjustable....however, all of the SP1's and SP2's can use a suspension upgrade. Send the forks to Dan Kyle (or buy Ohlins R&T's) and either get a Ohlins or Penske rear shock and you'll be good to go.
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post #4 of 15 (permalink) Old 07-10-2008, 05:07 PM
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FI, frame, swingarm are the major updates from the Sp1 to Sp2. The suspension on the SP1 is also Showa and fully adjustable....however, all of the SP1's and SP2's can use a suspension upgrade. Send the forks to Dan Kyle (or buy Ohlins R&T's) and either get a Ohlins or Penske rear shock and you'll be good to go.
Do you know for any other engine differences...other than EFI?
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post #5 of 15 (permalink) Old 07-11-2008, 05:11 AM
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This little article details changes in the SP2 RC51 which came out in 2002. I've wanted this bike since it's intro in '00, I'm glad I waited, the SP2's seems to have been tweaked just a tad nicer............................. John

Whatever the multimillion-dollar factory riders want, it seems they get. And if any of those changes happen to benefit street riders, well fine--but it's almost an accident. So it is for 2002: A multitude of tweaks have arrived to make the '02 RC51 more competitive on the track, but the trickle-down effect is that the bike is now much improved for puck-wearing plebes.

For '02, Honda chose to tweak the engine a bit, put the entire bike on a part-by-part diet and significantly revise the suspension, chassis and swingarm. Down in the engine room, the throttle bodies have been supersized from 54mm to 62mm, and the two injectors feeding each combustion chamber now sport 12 laser-drilled jets, rather than the four little garden hoses of the previous bike, for a finer spray. The injection and ignition mapping were tweaked, also, resulting in throttle response that's as smooth and creamy as a nougat filling. (Don't tell Nicky; he's got a sweet tooth.) The new motor feels same-same in terms of power output; Honda claims a two-horsepower increase for 128 hp at the crank--but the low-rev snatchiness is nowhere to be found.


The engine is warmed over, but as Honda's Doug Toland said at the intro, "All of the 'magic' of this bike is in the chassis." The new Pro Frame looks similar to last year's and has the same amount of rigidity, but weighs 260 grams less and is more linear in its absorption of stress thanks in part to the new stamped engine hangers (previous units were cast). Also new is a steering-damper boss up by the steering head, but on the stock geometry you'd be hard pressed to make this bike shake its head on the street or track.

Even though the steering-head angle has been reduced one degree to 23.5 degrees--the steepest of any Honda--the RC51 feels planted at all speeds, even at 130 mph through Willow Springs' infamous Turn Eight. There you sit, tucked behind the splendid new windscreen that's 1.2 inches taller than last year's, sensing no instability from either end of the bike. Of course, the new swingarm (890 grams lighter) is 16mm longer and aids the stabilization effort.


Right above that sexy new swingarm is a revised shock (115 grams lighter). It's been repositioned to allow room for aftermarket exhaust systems, but also had its linkage ratio tweaked (4 percent softer on the bottom, 5 percent softer on top), even though spring rates are the same. Nine percent more compression damping has been added along with 11 percent more rebound. Up front similar tweaks have been applied. The fork (145 grams lighter) is now 9 percent softer on compression, up 16 percent on rebound, with the same spring rate. Fork travel has also been increased from 4.7 to 5.1 inches. These changes make the bike feel plush and controllable--a far cry from the wooden feel of the previous bike. The suspension is simply awesome now, soaking up midcorner ripples yet never getting out of line or doing anything untoward.

Steering effort is drastically reduced on the new bike. The RC51 is no 954 in terms of flickability, but the new bike turns in with an ease and precision that's head and shoulders above the old bike. Pick your line, shove the bar and you're there. The previous unit's brakes were fine, but the new four-piston jobbies are even better. The old brakes were extremely progressive--once activated you only had to move your finger a smidge to stop the bike. The new brakes are totally linear and require more lever travel, providing better feel, easier modulation and more feedback.


Speaking of feedback, the RC51 comes wrapped in a new flavor of Dunlop rubber named D208. The 208s are quite soft for a street tire, which allows them to heat up quickly and throw down GP-like grip. Feedback from both the front and rear was excellent, with excellent straight-line stability and precise steering at high and low speeds.

Our only complaint (and we think some folks at American Honda's marketing department will back us up on this) is that the bike looks exactly the same as last year's. Europe gets a bitchin' white/grey, but we get the same paint job as before. If you go out and buy the "new" model with all the killer updates, you want people to know, but it's literally impossible to tell the two bikes apart from a distance.

Paint job aside, the changes made to the RC51 for '02 signify a Paul Bunyan-size step forward. Oh, did we mention the '02 RC51 is the same price as last year?
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post #6 of 15 (permalink) Old 08-09-2008, 02:41 PM
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Originally Posted by njracer View Post
FI, frame, swingarm are the major updates from the Sp1 to Sp2. The suspension on the SP1 is also Showa and fully adjustable....however, all of the SP1's and SP2's can use a suspension upgrade. Send the forks to Dan Kyle (or buy Ohlins R&T's) and either get a Ohlins or Penske rear shock and you'll be good to go.
Ditto on sending the forks to Kyle Racing. If there's such a thing as an RC51 Guru, it's Dan. GREAT work, VERY reasonable cost.

Last edited by PiasanoRacer; 08-09-2008 at 02:50 PM.
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post #7 of 15 (permalink) Old 10-07-2008, 01:23 PM
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Everything they learned in WSBK with the SP1 was applied to the SP2.
So technically, the SP2 is the better bike.
But for the street, either is great.
But...if you have an SP1, for sure get the Kyle Racing rear suspension link.
It changes the rear linkage rate from progressive to linear.
The SP1's were known for really stiff rear suspensions and the Kyle link changes that.
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post #8 of 15 (permalink) Old 10-07-2008, 02:16 PM
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For the SP1's, the Kyle Racing rear link a must.
It changes the SP1's progressive rate linkage to a linear rate.
Fixes the notorious harsh ride the SP1's have.
Has slight benefit for the SP2's as well, but not as pronounced.
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post #9 of 15 (permalink) Old 10-10-2008, 01:18 PM
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What about plastic? Are the SP1 and SP2 platics interchangeable with the frame changes? I have an 01 SP1 and I am shopping for plastic.
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post #10 of 15 (permalink) Old 10-10-2008, 03:17 PM
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I'm not totally 100% sure as I have an SP2, but I believe the side fairings will interchange. They seem to be physically similar in the service manual.

The lower inner fairing on the SP1 used 8 clips vs. 6 for the SP2.
There may also be subtle differences in the way the decals are placed, so they may not match with the upper cowl (fairing).

Any SP1 owners out there with input?
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