250cc 4 stroke class

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250cc 4 stroke class

Postby Roger@Arroyo » Tue Jul 30, 2013 5:15 pm

Starts in September.

We will be using common rules from other clubs as a starting point.

1. Eligable motorcycles.
a. 250cc 4 stroke single or twin cylinder production street legal motorcycles. At the moment we will list motorcycles eligable for the class. If you feel there is another bike that should be legal let us know and we'll review. Currently, EX250 Kawasaki, CBR250 Honda, VTR250 Honda, Hyosung 250.

2. Modifications allowed. '
a. Pre 2008 models are allowed to switch to late model Ninja 250 wheels and calipers/rotors to make it work. No complete front end swaps.
b. Carburators may be rejetted but must remain the original carburator that came on the bike.
c. Bodywork may be removed or exchanged for any bodywork.
d. Front forks must remain original, although they may be resprung or revalved.
e. Rear shock may be changed.
f. Handlebars and controls may be changed.
g. Fuel must be pump gas or equivelant. No oxygenated race fuel such as VP U4 etc...
h. Exhaust may be changed.
3. Not allowed
a. Engines must remain stock as from the factory. No valve jobs, no head milling, no thin head gaskets, no cylinder milling, no balancing, no porting or any other internal engine modifications allowed.

4. Complete charging system must remain intact.
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Re: 250cc 4 stroke class

Postby blendedfamily » Tue Jul 30, 2013 5:47 pm

5. One donor bike must be available at all times so that Tony can ride it at his leisure whilst he is broke and in school.
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Re: 250cc 4 stroke class

Postby duggram » Wed Aug 07, 2013 2:58 pm

How about a Yamaha WR250R? It's street legal but would probably need a wheel change. I think all the WR's are down at least 1 HP to the Ninja.

Also, what about the WR250X? At least it has the right wheels and tires, and is street legal.
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Wed Aug 07, 2013 9:10 pm

No on the WR. It's not in the spirit of the rules for low hp and less than modern technology bikes. It may have only one HP less than the Kawi, but it also weighs 75lbs less and has a modern MX motor and suspension. That goes for any modern dual sport machine.

Now, want to talk 90's and earlier XL250's......
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Re: 250cc 4 stroke class

Postby ZiaThunder » Thu Aug 08, 2013 3:58 pm

Nice... I'm going to need to bring both bikes down there before the year ends.
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Sat Aug 10, 2013 2:58 pm

One thing we will change is the wheel choice. Any 3x17 inch OEM front wheel and brakes may be used as long as it came stock OEM on a japanese motorcycle. The reason we went with this choice is because all the newer 17 inch ninja wheels are priced very high used due to demand in 250 spec series across the country, and expecting people to spend $800 on a set of used wheels for the ninjette class is stupid.

Personally, my plan is to try to make the stock forks work and continue to use the 16 inch tire for the time being.
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Re: 250cc 4 stroke class

Postby duggram » Sat Aug 10, 2013 8:58 pm

I saw a comment somewhere (WERA?) that the BT003's on the stock rim worked good. Does that sound right?
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Sun Aug 11, 2013 11:47 pm

I don't have the new style, and they don't make them for the older bikes with 16 inch rims, so I have no clue. Both Pirelli and Bridgestone make actual race tires for the 17 inch wheeled Ninjette's
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Re: 250cc 4 stroke class

Postby Lucky13 » Tue Aug 13, 2013 8:54 pm

Who's running your Ninjette, Roger?
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Wed Aug 14, 2013 9:58 pm

Not sure yet, I'm sure I've got to give it a try.
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Re: 250cc 4 stroke class

Postby tuscani451 » Fri Sep 06, 2013 5:50 pm

Not that it matters much to me but just curious if the Ninja 300 is legal for this class?
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Fri Sep 06, 2013 7:24 pm

I'm of the opinion of no, but we can vote on it at the riders meeting.
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Re: 250cc 4 stroke class

Postby odduc1098 » Fri Sep 06, 2013 9:53 pm

Roger...you trying to resurrect the lost art of carb jetting by eliminating the 300?...lol
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Re: 250cc 4 stroke class

Postby findgold » Fri Sep 06, 2013 10:08 pm

tuscani451 wrote:Not that it matters much to me but just curious if the Ninja 300 is legal for this class?

The 300 ninja is almost the same bike as the 08 --12 250 ninja. the 300 has a longer stroke and larger bore engine to get 5 more hp then the 250 and the 300 has fuel injection.
Keep the 300 Box stock.. only change tires, shock, front fork valving/oil and maybe add rearsets. and anything goes on the 250 and maybe that would keep it kinda fair. :mrgreen:
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Re: 250cc 4 stroke class

Postby Roger@Arroyo » Mon Sep 09, 2013 7:44 am

After riding both the older 250 and the new 250 back to back this weekend we will definitely have to allow front end swaps on the old bikes, 3 seconds a lap difference and I'm sure the chassis has some percentage of it, and the forks too, but the tire difference is too much to overcome.

So, front end swaps allowed. Conventional (non upside down) forks, single disc only swaps will be allowed. The reason for allowing non 250 front end is that there are a ton of different front ends and people seem to want top dollar for newer style 250 front ends because of all of the spec classes nationwide and we want it to be the least expensive upgrade possible. Loren has suggested another club allows EX500 front ends, which would be cheap and viable.
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Re: 250cc 4 stroke class

Postby findgold » Mon Sep 09, 2013 11:17 am

This is from the MRA (Colorado) rule book. Which makes a low cost class/s and requires Box stock from air box intake to exhaust port. For the most part.
SMRI rules are a little more loose. In that they allow removal of the air box.
Over the past years I have tried to keep my ninjette as close to MRA race specs. because I once had plans to do some racing up north. (may still do that). Also if I remember right CVMA ninjette class is almost the same as MRA and I would love to race that track also. Maybe someday if I live long enough. :mrgreen:

2.10 Production Cup Classes
This is an amateur class designed to provide lower cost, highly competitive “spec racing”.
Production Cup racing is separated into three displacement categories: 250cc, 400cc,
and 500cc. All Production Cup motorcycles are required to be four-stroke single or twin
cylinder, produced and sold for street use in the United States.
Only the following modifications from showroom stock are permitted:
A. Bike must comply with safety standards listed in section 5.2 EXCEPT that the
Production Cup Class does not require a steering damper. Steering dampers may,
however, be added at the riders discretion.
B. No engine modifications of any kind are permitted. Engine configuration must
remain as delivered from the factory. Rebuilding or refreshing motor with
Standard Specification Stock Production OEM parts is allowed.
C. The stock airbox, air box cover, air filter and intake snorkel must remain in
place and connected as they came from the factory. The air box drains may be
sealed for fluid retention. No other modifications of the airbox, air filter or intake
snorkel is permitted.
D. Bodywork, windscreen, fairing stay and bodywork mounting brackets may be
replaced with parts of unlimited origin. Relieving bodywork for clearance of
hand and foot controls, exhaust and frame sliders is permitted.
E. Exhaust systems, including exhaust bracket assembly may be replaced with parts
of unlimited origin.
F. Carburetor jetting consisting of main jet, pilot jet, needle and slide hole size may
be changed. No other modifications to carburetor are allowed.
G. Fuel injected motorcycles may utilize and aftermarket tuning device for the
purpose of fuel management only.
H. The PAIR valve may be blocked or removed with parts of unlimited origin.
I. Suspension may be modified with different springs, valves and oil. The stock
rear shock body and stock fork tubes must be retained and unmodified. Preload
adjusters may be added to the forks. The stock damping rod must be retained,
but may be modified. Rear ride height may be altered or adjusted, including use
of aftermarket dog-bones.
J. Brake pads may be replaced with parts of unlimited origin, however brake
calipers and rotors must remain stock.
K. Brake lines may be replaced with parts of unlimited origin.
L. Hand and foot controls, rearsets, handlebars and levers may be replaced with parts
of unlimited origin. Brake master cylinders and throttle control must remain stock.
M. Gearing may be changed by replacement of chain and sprocket only. These parts
may be of unlimited origin.
N. Tires must be DOT rated tires only.
O. Stock charging system must be fully connected and functional at all times.
P. Instrument cluster may be removed and gauges may be replaced with parts of
unlimited origin.
Q. Only DOT approved street legal pump gas may be used. NO race gas or
performance fuel additives are allowed. At the discretion of the MRA, fuel may
be supplied to competitors at prevailing market price.
R. Parts which are not critical to bodywork or integral support may be removed,
but they must be removed at the stock mounting or bolting point. Cutting of
materials or frame is prohibited, with the exception of the kick-stand bracket
which may be removed for ground clearance. The countershaft sprocket cover
may also be modified or removed.
S. For Kawasaki EX250’s manufactured prior to 2008, the following modifications
beyond stock are permitted:
a. Wheels may be replaced ONLY with OEM 2008 and up 17” Ninja 250 wheels
or any year EX500 wheels.
b. Rear shock may be replaced ONLY with OEM 2008 and up Ninja 250 shock
or any year EX500 shock.
c. Front end including upper and lower triple, forks and brakes may be replaced
ONLY with OEM 2008 and up Ninja 250 front end or any year EX500 front end.
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Re: 250cc 4 stroke class

Postby ZiaThunder » Mon Sep 09, 2013 4:44 pm

I went up to HPR in June and ran in the 250 class. We had over 20 bikes on the grids. There were about 5 racers from Chuckwalla there on 250s as well. Those dudes where screaming fast. At least one of them was turning 2 min or less lap times. Now that is moving! There are experts on bigger bikes that don't go that fast.

I'm still hoping to make it down there for a race weekend so I can run the 250 on the track, it seems like it would be a blast.
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Re: 250cc 4 stroke class

Postby tuscani451 » Wed Sep 11, 2013 9:07 pm

Looks like I have a bike to ride this weekend but I am still in the market for my own. If anyone hears of any 2008+ low mileage bikes especially already raced prepped lmk
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Re: 250cc 4 stroke class

Postby blendedfamily » Thu Sep 12, 2013 5:50 am

they're on WERA classifieds like every week
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Re: 250cc 4 stroke class

Postby tuscani451 » Thu Sep 12, 2013 9:25 am

blendedfamily wrote:they're on WERA classifieds like every week

Ya but they're in CO or FL, once you factor in shipping it ends up not being a good deal
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