What's Normal for RPMs

[yamahey]

I have an 03 shorty with an M-10 and rip-saw. When I stomp it she hits about 9600 and then slowly climbs, but only to a little over 10,000, maybe 10,100. It seems like it used to go a little higher with the original suspension. What do I need to do to get it a little higher? Different primary spring? Other than what's mentioned above she is stock. 3,000 miles.

 

[Turk]

That clutching ain,t bad & you are very close to being perfect. If you ant a few more rpm,s get a green-silver-green primary spring. Should be good for about 1-200 rpm. You don,t want more then that but what you have now is very good.

 

[ReX]

Are the 03's clutched differently than the 05's?

When mine had low miles on it it behaved as you mention above (in fact, lower rpms).

Now with 5400 kms on it, it pretty much jumps to 10,300-10,400 and climbs to about 10,600.

The belt does have about 1500 miles on it (when I installed it I noticed a couple hundred rpms drop from the previous belt, so I'd probably loose a couple hundred with another new belt) and I'm running CR10EK plugs.

Other than that it's 100% stock.

I'm not really sure what is "normal" though. Mine might be overrevving compared to most RX-1's.

 

[yamahey]

Thanks, Turk. I have heard people talking about 10,500, and thought maybe that was more normal. I might try the spring you recommend and see how I like it.

 

[Skydog]

Turk is a clutch GOD! Trust me!!

Skydog

 

[welterracer]

almost rx


Change that belt... its toast

Ive got 3300 miles on my sled and its on its third belt

 

[ReX]

Turk is a clutch GOD! Trust me!!

Skydog

So Turk, should I be looking for problems with my 05?

I checked all of the primary bushings/weights/rollers and everything on the secondary last week. Everything seems in pretty good shape.

 

[Turk]

A new belt will lower rpm,s. 9800-10,200 is saweet for a stocker or turbo or happy gas. I have never heard of a stock clutched sled that ain,t been tweaked to overrev. Maybe secondary spring is binding preventing upshift????

 

[Dano]

Are the 03's clutched differently than the 05's?

I believe yamaha added larger rollers in 04-05 when they added the 1.25 ripsaw track. I guess this was to raise the rpms from the greater rolling resistant of the larger heavier track vs the original lightweight finger track.

Turk,
good recommendation on the roller rooster. Bought and installed one a couple weeks ago and works great.

 

[ReX]

A new belt will lower rpm,s. 9800-10,200 is saweet for a stocker or turbo or happy gas. I have never heard of a stock clutched sled that ain,t been tweaked to overrev. Maybe secondary spring is binding preventing upshift????

I haven't pulled it apart, but the secondary seems in good shape (not too sloppy, the "buttons" have a fair bit of life left, there are no odd marks on the spring I can see, and I can fully open it without too much trouble by hand - doesn't feel like it's binding). Also the backshift is very, very good. It snaps pretty much to 10,300 at any speed and pulls like mad. My only complaint performance wise is I don't have enough traction.

The fastest sled I run with is a slightly modified '00 XCR800 (modified air box, Boysen reeds, jetting, etc.). He hooks up better in the icy conditions around here (144 studs vs my 0 studs), but at higher speeds we top out the same (although if we go back and look at the tracks I'm typically spinning, even at 100+ mph).

I think you're right about the belt bringing the rpms up, but I measured the width and it's better than 1/2way betwen new and mininum width. There also aren't any signs of cracking, etc.

I wonder if the tack is out of spec?

I don't think I'm going to mess with it. It runs very well, lots of power, snappy throttle response, doesn't burn oil, gets good gas mileage, and isn't revving high enough to damage the motor.

It does seem a little odd that it's revving so much higher than the other sleds out there, especially since it started out unable to rev over 9000 for the first few 100 miles. I'll probably pull the clutches apart in the summer and change the bushings, rollers, etc.