500cc Supersport.

[apriliaman]

This class is similar to the Lightweight Sportsman class when I started in 2000.No Ducati and no SV 650 allowed.My FZR 400 is a street bike that can be put on the track.I can ride it 400mi a day no problem.At summit i'm gonna actually ride it to the track and take the lights off and race it as I got no way to get 3 bikes to the track.My bike weight is 410lbs with a full tank of gas.It made 62hp in 2000.When I got it he said it had a 1 mil piston with stock compression,the rest is all stock.So it is ok in the rules for supersport as your actually allowed to do that.I still got the same engine in it when I got it untouched and put 16,000mi on it since then.I never cleaned the carbs since 2000 and still runs good.

[Eric Kelcher]

To clarify and address publicly a couple of emails we have received regarding this class; appears they may have been asked here resulting in the emails.

Aprilia RS250 "Cup" bikes were not street legal machines sold in North America, they were granted permission as a non-standard model for Lightweight Supersport. That permission for LSS does not translate into approval for 500SS. We will be watching the SXV450 for dominance as their US street certification I missed(thought it was only the 550 that received DOT compliance)

Displacement limits are absolute so while a modification may be SS legal a modification may push it outside the class rules. aka a 400 liquid cooled 4 cylinder is limited to 400cc not 400cc +1mm overbore.

It will run a limited schedule as a CCS class, to enter cross out a class you are not entering on the entry form write 500SS and bike info, the fee is $80 if your first class $55 if an add'l class. ($85/60 post entry).
We have made a commitment to this class for at least 2 years to determine growth and class rules as written.

[apriliaman]

The Aprilia RS250 is street legal in other parts of the world and can be in the USA with the know of doing the paperwork..Ive seen many on the road in Florida.At the shop I go to in Delaware they have one there with tags on it.

[apriliaman]

As for the FZR 400 my engine was put together over 20 years ago and never opened.In the rules for Supersport it says  straight from the rulebook.
E.  Engine modifications include the following:
(1.) Pistons which are no larger then 1mm over stock size maybe used but must be same compression ratio as the OEM piston.
It is a Supersport class so it is allowed.

[jp233]

A properly ridden TZR250 would be the bike to win on, I think... the motor is basically a TZ motor with some different carbs, and a few other bits. Could have basically a TZ with a TZR frame,

But running a TZ for this class could be over-kill on the track, and on the wallet.

Heck, even an RZ350 that was dudded up, could haul the mail.

[apriliaman]

I guess the CC limit is max no matter what even if the rules say 1mm is ok but if it goes over the limit you can't do it.Guess It's time to take apart my engine after all these years and find a way to make it back to stock 399cc.

[Capitalview]

Wonder how a Ducati 620 would do.

[jfboothe]

Wonder how a Ducati 620 would do.

I think the note states: NOTE: Ducati/Bimota/BMW Supermono/Woods Rotax are excluded from this class.

[SVbadguy]

A Duc 620 is not the Duc Supermono.

[Gino230]

Monster 620 is heavy, slow, and out of production. Ducati is going away from the air cooled engines completely- this year.

I spoke to Al Luddington at AMA last week, they have not written the rules yet. He did state the primary bikes for the class will be the KTM 390 or the Honda.

Why not do like AMA and just make a list of bikes that are eligible? Of course their rule book is complicated, and subject to a million technical bulletins and exceptions......

Sounds like a neat class, I wish I was 100 pounds lighter, I'd run that little KTM in the AMA!

Just curious, what kind of hp does a TZ 250 make? My Aprilia 250 cup made about 60... The KTM and Honda are in the 55 range?

[Gino230]

http://www.ktm.com/supersport/rc-390/highlights.html

[2blueYam]

While it is a bit heavy and hasn't been made for a while, I would imagine a well prepared 620 / 620ie would be competitive. They are certainly easier to find than a SS legal FZR400. You can get one for well less than the price of a new CBR500 (particularly with all of the add-on costs of a new bike purchase). Figuring out the handling shouldn't be that different than the other Monsters already racing in other series and classes, so you would be a step on the Honda there as well. What you will not get is Honda contingency, assuming they are paying it, you are fast enough and there are enough people in the race. Oh, and the other thing you don't get with the Honda is the Ducati parts bill when something breaks or needs maintenance.