250cc Proddies

[Stavros]

They're back for 2012. National racing class:

http://www.ma.org.au/fileadmin/user_uplo...srules.pdf

2012 – 250cc Production class rules
15.10 250 Production
15.10.0.1 Subject to the required and permitted alterations set out below, 250
Production machines will be subject to air inlet restrictors for power parity
adjustment, air restrictor dimensions will be set out in the
Supplementary Regulations after MA Authorised testing and must:
a) Be fitted with ADR compliance plates for the particular machine,
b) Be eligible for registration in all States and Territories in which they
compete,
c) Be of a make and model lawfully sold in Australia,
d) Be as constructed by the manufacturer,
e) At least 30 production machines of that make and model must have
been imported into Australia by the manufacturer or the Australian
distributor representing the manufacturer.
f) Be manufactured with a 250cc Four stroke engine
15.10.0.2 Tyres must be homologated by MA and or listed in the
Supplementary regulations and must:
a) Be commercially available in Australia,
b) Be manufactured for road use in all weather conditions,
c) Be not less than the machine manufacturerʼs recommended speed and
load rating,
d) Be worn no more than to the minimum tread depth indicators,
e) Not be manufactured for only competition use,
f) Not have an augmented or modified tread pattern,
g) Comply with the service description (load and speed rating) as
permanently moulded on the OEM tyre side wall,
h) Comply with the relevant requirements of the nominated standard. e.g.
ETRTO, JATMA & TRA.
15.10.0.3 The following must be removed:
a) Head lamp,
b) Tail lamp,
c) Reflectors,
d) Horn,
e) Traffic indicators,
f) Mirrors,
g) Centre and side stands,
h) Registration plate / bracket and label holder.
i) OEM top rear chain Guard,
j) Passenger footrests,15.10.0.4 The following may be replaced or modified:
a) Fairings and stream lining including screen, rear body work and seat
section, mudguards, tank covers. providing the replacements are of the
same shape and appearance as the original.
b) Mounting bracket for fairing, screen and instruments, but replacements
must be mounted in the original position on the frame,
c) Spark plug type,
d) External gearing and chain, but not chain pitch,
e) Brake pads, linings and brake hoses,
f) The muffler and tail connector pipe at the bolt-on or slip-on flange joints
only, the original header pipes must remain as supplied by the
manufacturer,
g) Front and Rear suspension springs and internal damping parts may be
modified or replaced, but the external appearance of the forks and rear
shock must not be changed,
h) Handlebars and handlebar mounted levers, but replacement
handlebars must be mounted in the original position on the fork
assembly or top clamp
i) Footrests and foot controls, but the replacements must be mounted at
the original mounting points,
j) Air filter element,
k) Engine and gearbox breather tubes and the radiator bottle overflow
must exhaust into the air box to the rear of the intakes. The lower air
box breather tubes must be blocked.
15.10.0.5 The following may be added:
a) Steering damper,
b) MA approved fuel metering devices that plug into the original electrical
connectors with no modification to the wiring harness. Std OEM ECU
must be retained and operative,
c) Screw in replaceable fuel metering jets but carburettor body castings
and slides must remain as manufactured by the Manufacturer
d) Frame Protective Sliders

It doesn't say anything in there about bikes only being eligible if they are a current model, only that they must have been imported by the manufacturer. So, no grey imports.

Interesting, no?

[King Kenny]

Interesting........

Now what can be done to the bikes


Missed you at the end of MotoGP. I got a photo with Simoncelli which was worth the wait (8pm) then but obviously so much more now

[Hessian]

That sounds like a lot of fun

[Beer Baron]

that sounds awesome. I can't help but think an MC22 would be the gun bike in that class.

from the regs it looks like you can do a slip on/bolt on can, internal shock/fork mods, pads and fluid, air filter and the best street legal tyres you can get.

the only worry is the air intake restrictors. need to find out what size restrictor they want people to run. but even then what 4 stroke 250 is better than an MC22 (asking honestly)? I can't really think of one right up to current models that would outperform one in power OR handling.

providing the restrictors are big enough to allow it to run with it's full 40-45hp it would be a weapon against modern ninja250, CBR250 etc.

[Merudo]

Wicked.

[Beer Baron]

this bit is the killer:

15.10.0.1 Subject to the required and permitted alterations set out below, 250
Production machines will be subject to air inlet restrictors for power parity
adjustment, air restrictor dimensions will be set out in the

if they hamper an MC22 with tiny restrictors and keep it down to 25hp like a ninja or CBR250R then it might struggle a bit. probably still better frame, better brakes etc but the weight penalty of a 4cyl donk vs single or twin without any power benefit will make it a bit of a nugget.

the other problem is sprockets. you can't change to a 520 chain so you need to use original pitch sprockets which might limit choice a bit.

[akeizm]

Even with the power reduced I thought MC22's were lighter than the modern 250cc's anyway.

[Chrissybenn]

wonder who is gunna bother with the new 250's... the zx2r(was it officially imported) and the mc22 should make up a few entries. even with some intake restrictors.

hell even a suzuki across should have more potential than a new cbr250r

[Pronto]

I am surprised they didn't limit RPM range in any way. I know they did in Moto2 though...

[Chrissybenn]

(08/12/2011 08:11)Pronto Wrote:  I am surprised they didn't limit RPM range in any way. I know they did in Moto2 though...

moto3 you mean? wouldnt matter in moto2 as they all have the same engines.