F3 TZR

[mboddy]

I like that bike !

Me too. Best bike I have ever ridden.

Do you want more pics?

[jools]

Why the FZR swinger over the stock one Mark

[mboddy]

Why the FZR swinger over the stock one Mark

I always liked the look of the Deltabox swing arms.
It is about 1/2 kilo lighter and appears to be stiffer.

[tzr-v4]

I always liked the look of the Deltabox swing arms.
It is about 1/2 kilo lighter and appears to be stiffer.

The FZR250 3LN is in alloy ?
The FZR400-600 from same era are metal not alloy.

Rear wheel is 2XT in 3.5" wide and normally same as FZR250 ?

[mboddy]

The FZR250 3LN is in alloy ?

Yes. It has more weight around the front and less near the axle.

Rear wheel is 2XT in 3.5" wide and normally same as FZR250 3LN ?

Yes. 3LN wheels are common here because the engines blow up.
3.5" rear and 2.5" or 2.15" front are used with GP125 or GP-Mono slick tyres or racing wet tyres.

Pic with Bridgestone front slick:
   

[tzr-v4]

TZR250 2XT front wheel is 2.75" wide as standard so 110/70 tire is OK.
Front axle is larger 15m in diameter is memory serves me 
So front fork legs are different.

FZR250 early model front wheel is same as TZR250 1KT 2.15 or 2.50

Will check which as 2.75 wheel 

[mboddy]

Best size for the GP125 or GP-mono slick is 2.5" rim.
SRX400 or SRX600 17" wheel is 2.5" and disk lines up perfectly.
Once you ride these bikes on GP125 slicks then you will never consider anything else.

[jools]

What size are the slicks you are using Mark ?

I'm still undecided................

[mboddy]

They are GP125 slicks - 90 front and 120 rear.
We will be racing against NSR250, RGV250, KR-1S and 3MA which all are newer designs with wider wheels, twin disks and stiffer frames.
Our advantage is that we will corner like a GP125. GP125s corner faster than GP250s.
No way would I give away my advantage by fitting wider tyres.

[tzr-v4]

Is the class allow engine tuning ?
If not power will be an issue against NSR, RGV...

[mboddy]

Is the class allow engine tuning ?
If not power will be an issue against NSR, RGV...

Engine tuning is no problem.

[tzr-v4]

You are running 2XT top end ?
Using the 2XT large reed valves too.

[mboddy]

You are running 2XT top end ?
Using the 2XT large reed valves too.

Yes. And 34mm Carbs, modified YPVS controller and Mestre ignition total loss.

[tzr-v4]

Cylinders are 1KT = cast iron ones
2XT are nikasil ones => pistons hard to find (TKRJ has run a batch).

Jean Paul Mestre ignition?

Are you run it on a dyno ?

[mboddy]

I have only raced it with the 1KT cylinders so far.
The 2XT cylinders are on their way back from NZ Cylinders who have stripped the Nickosil
and bored them to fit DT125R Wossner pistons and then put the Nickosil back on.
Philip in England is making us a few sets of inner powervalve bushes as they also are unavailable.
Here are the first two he has made me:



He has also made the other powervalve bushes in the past and so has those dimensions too.

I have used the JP Mestre ignition and adjustable YPVS in my racing TDR250 for quite some time and so I know it is a good thing.
Haven't had either the TDR or TZR on the dyno yet though.