Ultimate F3?

[James Deuce]

So let me get this clear.



You are allowed to use non-production based racing bike frame in F3 ?



Very first sentence of the F3 rules in the latest rulebook/manual

"The Folmula 3 Championship class will exist primarily for Production Based machines ....."



but you are allowed to get the lastest racebike from off the GP circuit and repower it with a production competition (non roadgoing) dirtbike motor?

You can buy an Aprilia RS125 from a dealer for $9995. It has lights and shit.

You can buy an Aprilia 550 Motard from a dealer for $17k or so. It has lights and shit.

[svs]

i think the appropriate word is "primarily". it doesn't say "exclusively" or "only".

i think the issue might be with the over 500cc and 3 or more valves per cylinder would mean that it would have to retain the standard OEM airbox, air filter and carb.

as long as it complied with that, it would be awesome.

[quallman1234]

Jim it was the Honda RS Frame not the Aprilla RS frame. The Honda frame is far more supeiror to the Road Going Aprilla Frame.

For the record the Honda RS Frame is Produced (2000 odd a year or something) and you can only get one what is 3 years old.

Plus adding a heavier engine in to such a frame make's alot of other things difficult.

[GSVR]

i think the appropriate word is "primarily". it doesn't say "exclusively" or "only".

i think the issue might be with the over 500cc and 3 or more valves per cylinder would mean that it would have to retain the standard OEM airbox, air filter and carb.

as long as it complied with that, it would be awesome.

We've been down this road before over a year ago if you remember Phil. I know what your views were on it then.

Funny how you can't put an RG250 engine into an RS250 frame. Thats against the rules. But as long as its a fourstroke and fits the engine rules for the motor your using your sweet.

Last years nationals at Manfeild there was a repowered RS125 bike (Brent Symes).

I heard to the alot of the old RG250 engines were in a state of tune approaching a RS250 motor anyway.

[James Deuce]

Jim it was the Honda RS Frame not the Aprilla RS frame. The Honda frame is far more supeiror to the Road Going Aprilla Frame.

For the record the Honda RS Frame is Produced (2000 odd a year or something) and you can only get one what is 3 years old.

Plus adding a heavier engine in to such a frame make's alot of other things difficult.

That's an Aprilia RS125 frame. Read the German site. Look at the frame, that's no Honda frame.

[Sully60]

That's an Aprilia RS125 frame. Read the German site. Look at the frame, that's no Honda frame.

Sorry I might have missed something here? But the frame of the pictured bike is an SXV frame. As the article says stick on RSVR forks, some Flash bodywork, clipons and go!

[ardomus]

Does anyone know more about the new KTM sportbike soon to be relaesed...from what i read it looks like a single cyclinder 80hp sport bike..could be good f3 bike????

[skypig]

What capacity are the all dominating SV650s?

4-3 Twin cylinder four strokes shall be limited as follows:
a) Up to 500cc, no restrictions apart from fuel as above.
b) Over 500cc, two valves per cylinder, are restricted to 750cc and fuel as above, over 640cc must not be water-cooled.

Also converted MX/supermotard might run foul of:
B: Any machine complying with Rule No 34-2-3 and 34-5 is automatically excluded from
entering any Formula 3 event.
Would be a shame, the aforementioned converted CRF450 is a sweet looking ride

[pete376403]

What capacity are the all dominating SV650s?

4-3 Twin cylinder four strokes shall be limited as follows:
a) Up to 500cc, no restrictions apart from fuel as above.
b) Over 500cc, two valves per cylinder, are restricted to 750cc and fuel as above, over 640cc must not be water-cooled.:

Suzuki SV650S
Engine: 645 cc, four-stroke, liquid cooled, 90° V-twin, DOHC, 8-valves, TSCC
Bore & Stroke: 81.0 x 62.6 mm

I guess that is near enough for MNZ

[diesel pig]

What capacity are the all dominating SV650s?

4-3 Twin cylinder four strokes shall be limited as follows:
a) Up to 500cc, no restrictions apart from fuel as above.
b) Over 500cc, two valves per cylinder, are restricted to 750cc and fuel as above, over 640cc must not be water-cooled.

Actually rule C covers the SV650's

c) Over 500cc three or more valves per cylinder, are restricted to 650cc and fuel as above.
Additionally these machines must retain the standard OEMair box, air filter element and
carburettor (with the exception of removable jets or throttle body, including injector).

[skypig]

Thanks makes sense now

[mynameis]

Ok just a quick question to the ones in know. Common bikes raced in F3 are 250 2 stroke, 400 inline 4 and 650 V twins.

In my opinion the RS250 would be the best choice to race as they are light, suspension is great, brakes are awesome and the handling is a dream.

They all would do just over 200 k's. What's in thy 400 or 650 V twin that it's so popular. By the time you've done up your SV650 it would hit 10 grand anyway.

Why not a RS 250? I don't think there are many on the RS in F3 right?

[k14]

Jim it was the Honda RS Frame not the Aprilla RS frame. The Honda frame is far more supeiror to the Road Going Aprilla Frame.

For the record the Honda RS Frame is Produced (2000 odd a year or something) and you can only get one what is 3 years old.

Don't know where you got that info from? The RS125 frame (Honda) at its peak may have had that many produced but this year about 20 or 30 were made. If I got in soon enough then I could have got one for about $15k. No point in getting an 08 cause they haven't changed one bit since 95. Only diff is that a new one is not been crashed etc.

The tigcraft that easton had his YZF motor in is made by a company called tigcraft. They use the main parts of the RS frame with a few modifications and a different swingarm.

That bike shown on the first page is very cool. One of those engines in a tigcraft frame could well be very competitive. Might be too powerful for the frame though?

[k14]

That's an Aprilia RS125 frame. Read the German site. Look at the frame, that's no Honda frame.

No its not, its the standard frame the engine comes in. The fairing is off an Aprilia RS125.

[Ivan]

Its an idea I have been thinking of making a nice 450 motox bike into a road racer