I have read the rule book but just wanted to ask, just in case. On the 400 Ninja are the Braketech Axis Iron rotors allowed. And how about bolt on fork braces??? Just wondering. :)
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I have read the rule book but just wanted to ask, just in case. On the 400 Ninja are the Braketech Axis Iron rotors allowed. And how about bolt on fork braces??? Just wondering. :)
generally if the rulebook does not address. it, no. Don't read the rules as if its not addressed its ok but rather if its not addressed then no
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That’s kinda what I got from reading The Book. But then I read about people running 300’s in the 250 class so I thought well maybe........ :)
Pg 21 of the 2019 CMRA Rule BookQuote:
Originally Posted by Michael Roden
6.2 Sprint Series Categories
Superstock
u) Steel braided or Kevlar brake lines may be used. Brake pads may be changed. Brake pads may be beveled. Brake rotors may be changed to “wave” or “petal” type rotors of the same material and maximum diameter as the OEM rotors. Whether OEM or aftermarket, rotor edges may not be modified. Rear brake rotors may be modified (with the exception of edges) so long as modifications leave the rear brake functioning. No carbon fiber, cast iron or other exotic materials are permitted for brake rotors unless stock. No oversized rotors.
While not mentioned specifically fork braces are allowed in Superstock classes.
We are in the process of creating a list of general and machine specific allowances that have been granted. That list will be published along with the 2020 Rule Book.
Michael,Quote:
Originally Posted by Michael Roden
I'm glad you brought this up. A similar situation came up earlier this season where a rider made a modification to his machine that was outside of what is allowed in CMRA Superstock Classes. His justification was that a completely different modification (SV cam swap) was allowed on a different machine type in a different CMRA series. He believed that that because that modification was allowed that what he did would also be allowed. The difference is that the SV cam swap was requested, vetted, and approved years ago where his modification was not. Making this kind of assumption is a fast track to protest and disqualification. There is a process in place to request machine and class allowances. 300cc singles in the 250 classes is another example of an allowance that was requested, vetted, and approved. To start that process all a rider/team owner has to do is ask.
Begging forgiveness rather that asking permission is not acceptable.
Pg 25 of the 2019 CMRA Rule Book
6.3 Sprint Series Classes and Regulations
250 Superbike, 250 Superstock (Expert/Novice)
Up to 250cc 4-stroke air and water-cooled twins
Up to 305cc 4-stroke air and water-cooled singles
Any bodywork allowed.
All machines may upgrade to 17” wheels so long as they do not weigh less than the stock wheels for that model.
Kawasaki EX250 (Ninja), Honda VTR 250, CBR250R (with 305cc overbore allowed on CBR250R only), CBR300R, and Buell Blast using Superstock rules with airbox modifications or individual filters allowed. Aprilia RS125 (street bike) with aftermarket exhaust and carburetor allowed.
Formula 4 machines allowed in sprint class only.
That’s great. Thanks for the help.
6.3 Sprint Series Classes and Regulations
250 Superbike, 250 Superstock (Expert/Novice)
Up to 250cc 4-stroke air and water-cooled twins
Up to 305cc 4-stroke air and water-cooled singles
Any bodywork allowed.
All machines may upgrade to 17” wheels so long as they do not weigh less than the stock wheels for that model.
Kawasaki EX250 (Ninja), Honda VTR 250, CBR250R (with 305cc overbore allowed on CBR250R only), CBR300R, and Buell Blast using Superstock rules with airbox modifications or individual filters allowed. Aprilia RS125 (street bike) with aftermarket exhaust and carburetor allowed.
Formula 4 machines allowed in sprint class only
Walter can u clarify that
A cbr250 can be overbored to 305
But can u take a cbr300 motor and put it in a 250 frame and bore it to a 305?
I would think the tolerance for the 250 motor would be less then the 300 motor
Can u please clarify if this mod would be legal
It would seem if a cbr300 would have to conform to ss rules the answer would be no u could not do that
Please advise
Thank you
Since Manny brought this up, my opinion is that the the overbore for the CBR250 should be limited to 286(I think that’s the other kit available) NOT 305. 305 makes the CBR250r outclass the EX250. 286 might make it a bit closer. I was the one that actually suggested allowing an overbore(I recommended the 286 kit) for the CBR250 to make it more competitive with the EX, but I think the allowance went a bit too far...Quote:
Originally Posted by Manny Poulis
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I fully support this suggestion to reduce the overbore! I am obviously biased and certainly need to get faster but I have seen first hand how that overbored CBR dominates the EX. I am assuming the one winning is a 305 and no doubt the rider has the skill to dominate on it. Not trying to take anything away from him.
I still do not support a 300 motor in a 250 frame Manny.
Your funny John
Im not interestead in a 300 ninja motor in a 250 ninja as well
My question however did not get answered the question was can you have a CBR 300 motor in a CBR 250 chassis I would think that it would not be allowed however I would like to know the answer
I agree with the 286 rule
One more question about 500SS. How about aftermarket wheels as long as they are the same size? Aluminum. Not CF or Mg.
is a 250 super bike legal in 500 super stock race?
Nevermind....I see that it is legal for 500. Would a 300 superbikes be legal in 500 SS?
respnding to Walter's post about SV cams that were "vetted, etc,etc"
so...get it in the rulebook, along w any other special allowances or conditions, so any racer...new or old can actually see and read that rule. Otherwise, those "in the know" have the opportunity for a performance advantage others do not.
As the sole person racing a cbr250 in 2019 with an overbore, a couple of responses.
For Ryan, I think the other kit is a 287. The cbr300 is actually a 287 motor. Same bore as the 250, but with a longer stroke. I agree with you that this is probably the correct mod. Partially because the 305 kit is highly unstable. I blew my motor 8 times while trying the 305. I've been running the 287 kit for a season and a half with no issues.
For John, with either kit, the cbr250 is a truly great bike for the class. But not all because of motor. It has a good bit more torque then the Ninja, particularly in lower rpm's. As a result, it kicks the Ninja's butt out of the corners. But with either kit, its still down on hp. My latest video with Rusty is a great example - it gets pulled hard at the end of the straights, even after getting a better drive out of the corner. And at NOLA, that long front straight is a killer.
But the true brilliance of the bike is its handling. It took me a long time to learn to ride it to it's limit, but once there, there's no other bike in the class that can hang with the WeeBR on corner entry or mid corner speed.
Just my $0.02 now that I'm done racing it.
Damn it. Start your own thread. :)
I had a 305kit in my 250 a few years ago and had the same issues as Kyle. Ours would always get pulled on the straights but handled way better than the Ninjas. We didnt blow motors, but ate through clutches like they were made of paper. The clutch that broke the camels back lasted 1 practice session at Hallett before giving up.
We picked up an R3 on the way back to Austin.