450cc Triple eligible for F3

**koba** · 9th July 2008, 10:05

Originally Posted by steve74

a bit off topic but while we are talking F3, am i correct in my interpretation of the rules that you cannot get a standard 450cc mx bike and fit a road bike front end and shock (as per Roland sands 450 super singles concept) as the motocross derived frame is a no go. But there is no reason why you couldnt say put an RMZ450 or KTM525 in a rs125/nsr/rgv or even homebuilt chassis like jason eastons machine?

http://www.motorcycle.com/products/4...ect-68605.html

There has been one at the Vic club rounds this year.
Seems to go alright.

A guy a a track day had an RS125 with an older aircooled big single in it (XR500 I think) that was a beutifull piece of work with lots of work put into re-engineering the frame to work with the vibrations of the big single.
Dunno how well it went tho.

**quallman1234** · 9th July 2008, 12:28

Originally Posted by koba

Nope, Has got to be a twin.
And limited even further to keep GP parts out.

Rules.

I was actually talking about f3. Multicylinder 2 strokes up to 250cc are allowed.

**koba** · 9th July 2008, 12:56

Originally Posted by quallman1234

I was actually talking about f3. Multicylinder 2 strokes up to 250cc are allowed.

Ok but rule 5 (5-1 to 5-6-4) basicically excludes anything extreme being done with a multi-cylider two stroke.

**gimpy** · 9th July 2008, 17:41

Originally Posted by k14

A guy up north (saw him race at manfeild) had a CRF450 motor in a RS125 frame. Seemed to go alright, he had major issues with rear tyres though. Even the hardest compound 125 tyre he would chew right out.

The bike you are thinking of is properly brent symes bike, he made a great job of builting it,it was pretty quick too we had a line up at manfeild and our bikes were on par for top speed , the tyre issue is only a setup thing, I run b compound tyres on my bike most of the time and never had an issue ,it was better on tyres then my 125, it definitly pays to invest in good suspension with backup like Rob cross dresser Taylor can give you when builting shit thats abit different.

**Ivan** · 9th July 2008, 18:07

Originally Posted by gimpy

The bike you are thinking of is properly brent symes bike, he made a great job of builting it,it was pretty quick too we had a line up at manfeild and our bikes were on par for top speed , the tyre issue is only a setup thing, I run b compound tyres on my bike most of the time and never had an issue ,it was better on tyres then my 125, it definitly pays to invest in good suspension with backup like Rob cross dresser Taylor can give you when builting shit thats abit different.

Your tires were good worked well on my 125 until I upgraded to the SV and the other setarestill on my brothers bike haha

**FROSTY:Me** · 9th July 2008, 18:10

Hmm the 08/09 nats are gonna be interesting this year.

**slofox** · 9th July 2008, 18:37

Originally Posted by jnr

That is an interesting option to also sleeve it down, would have less drama with the unbalanced 'triple' also...

Years ago I raced a stroked down MAC velocette - from 350cc to 250cc.....worst bloody bike I ever rode...vibration paralysed your arms and dropped out your fillings.....but it CAN be done!

**k14** · 9th July 2008, 18:48

Originally Posted by gimpy

The bike you are thinking of is properly brent symes bike, he made a great job of builting it,it was pretty quick too we had a line up at manfeild and our bikes were on par for top speed , the tyre issue is only a setup thing, I run b compound tyres on my bike most of the time and never had an issue ,it was better on tyres then my 125, it definitly pays to invest in good suspension with backup like Rob cross dresser Taylor can give you when builting shit thats abit different.

Yeah thats the guy, wonder what's happened to him? His bike was pretty cool.

You should have come back to the 125 class again, or did all the young'ns scare you off

**gimpy** · 9th July 2008, 20:39

Originally Posted by k14

Yeah thats the guy, wonder what's happened to him? His bike was pretty cool.

You should have come back to the 125 class again, or did all the young'ns scare you off

Haha,i dont think it will be the young'ns scaring me off but being called the old fella in the class ,it wasn't that long ago I was calling steve ward that, must admit did have fun this year having a play with the young'ns and giving abit of advice.

**k14** · 10th July 2008, 09:02

Originally Posted by gimpy

Haha,i dont think it will be the young'ns scaring me off but being called the old fella in the class ,it wasn't that long ago I was calling steve ward that, must admit did have fun this year having a play with the young'ns and giving abit of advice.

Yeah I was laughing at the commentary about you on the tv coverage, those guys weren't letting up on you eh. Good luck with the f3 bike.

**svr** · 10th July 2008, 13:07

Originally Posted by k14

Yeah thats the guy, wonder what's happened to him? His bike was pretty cool.

You should have come back to the 125 class again, or did all the young'ns scare you off

Brent high-sided onto the front straight at Taupo in the 1st round of the last pmc series and broke his leg - about 15 minutes after complaining about getting a 125 tyre to work on the bike.
Lyndon Perry is the guy thats built the crf450 based bike.

**Ivan** · 10th July 2008, 16:48

I Think like Jason said it was etup as I had the ex Tigcraft tires and they were still mint they wernt chewing up and what I saw of that bike it was cleaning up