New racing class 399-660cc twin 4 strokes

[zadok]

A new road racing class has been proposed for beginners in Aus. to replace the 250 Proddies.
Could be interesting, when there is enuf bike selection.

Cheaper new bikes (around $10000)and easier to ride (80hp) than the currently four cylinder 600cc sportsbikes. There are currently about four bikes available for this class with more soon arriving in Australia.

Twin Sprints

1.1 Subject to the required and permitted alterations set out below, Twin Sprints must:
a) Carry all relevant compliance plates, (ADR);
b) Be eligible for registration in all states and territories in which they complete;
c) Be of a make and model lawfully sold in Australia;
d) Be as constructed by, or modified with the approval of, the manufacturer so as to conform with Australian design laws for normal road use; and
e) Be two-cylinder four-stroke engine of a capacity between 399-660cc.

1.2 Tyres must:
a) Be commercially available in Australia;
b) Be manufactured for road use in all weather conditions;
c) Be of the machine manufacturer’s recommended speed rating or higher;
d) Be worn no more than to the minimum tread depth indicators.
e) Not be manufactured for only competition use; and
f) Not have an augmented or modified tread pattern.

1.3 To be permitted to compete, a machine, without rider, empty of fuel, but with all other fluids at optimum levels, must weigh no less than 160kg. 1% tolerance at post race control will be allowed.

1.4 The following must be removed:
a) Headlamp;
b) Tail lamp;
c) Reflectors;
d) Horns;
e) Traffic indicators;
f) Rear vision mirrors;
g) Centre and side stands;
h) Registration plate / bracket and label holder;
Any sharp edges left by the removal of these components must be protected by a rolled edge or beading of minimum 3mm diameter.

1.4 Engine and gearbox breathing hoses and tubes, and the radiator overflow bottle vent, must exhaust into the airbox to the rear of the carburetor intakes. The lower airbox breather tube must be blocked.

1.5 The following may be replaced or modified:
a) Fairings, screen, rear body work, seat, mudguards, tank covers and frame side covers, but replacements must be the same in 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) Passenger footrests;
d) Spark plug type, leads and caps;
e) External gearing
f) Brake pads, linings and brake hoses;
g) Muffler and tail connecter pipe at the bolt on or slip on flange joints only, the original header pipes must remain as supplied by the manufacturer;
h) Front and rear suspension springs and fork internal components but external appearance must remain unchanged, original rear shock must be retained, but it can be re-valved;
i) Fuel metering jets and air filter;
j) Instruments;
k) Handle bars and handle bar controls.

1.6 The following may be added:
a) Steering damper;
b) Quick shifter;
c) Ride height adjuster;
d) Ignition cutout lanyard;
e) Rear sprocket chain guard.

[GSVR]

Sounds just like F3 here but excluding alot of bikes that would be of similar performance and speed.

I like the bit excluding race slicks as that would bring the cost down.

Most competitive bike would probably be a new SV650. In NZ you have to use a original unmodified air filter.

[aff-man]

What the hell If you remove all that stuff off a modern day gixxer 600 she'll weigh less than 160kg

[GSVR]

What the hell If you remove all that stuff off a modern day gixxer 600 she'll weigh less than 160kg

But a 600 Gixxer doesn't qualify for this class as it has 4 cylinders last time I counted

[aff-man]

ahhh dumb ass me i read it as 2 or 4 cylinder not 2 cylinder 4 stroke.

hmmm

She'll still be close for the sv maybe a couple kilo's in it....

[TonyB]

What the hell If you remove all that stuff off a modern day gixxer 600 she'll weigh less than 160kg

You do realise that the dry weights quoted by Japanese manufacturers are just that- no fluids AT ALL. No fork oil. No battery fluid. Nothing in the cooling system. No fork oil. No engine oil. They are bullshit numbers.

Woops, sorry. Slight hijack. As you were.

[GSVR]

A couple of weeks ago at Manfeild I put my SV on the scales a guy had set up to measure the weight on each wheel of racecars.

It was 86kg on the front wheel and 85.5 kg on the rear. This was with almost no gas in it, a light subframe,a very small battery and alot of stuff removed.

So I'd have to lose another 11.5kg to get to the limit.