Rule change submissions close 1 March 2016 - be in to win.

**TALLIS** · 9th February 2016, 19:35

Originally Posted by TZ350

When has an Aprilia 50 been allowed to run in F4??? news to me.

I think maybe he's abit simple rob, one more try. An f5 bike can beat f4 bikes in lap times and compete in the same race. An f4 bike cannot race in a f5 race ( which the only sole f5 race is the nz f5 gp) if you have a f5 bike, please bring it to a track and race it!

**Yow Ling** · 9th February 2016, 19:39

Originally Posted by TZ350

Actually it was worded as best I could after advice and is the best reflection of the existing rule with the aim of a definition covering a wide range of carburettor types and EFI throttle bodies. Yours might have a hidden agenda as your proposal restricts things in a way the original rule did not as it does not allow for any taper or other variations in the carburettor or inlet tract.

At this point I intend submitting my proposal the way it is and if it is accepted as a proposal by MNZ you will get a chance to put your views forward on its merits in April.

Mine has no agenda . As the current rule stipulates carburetion equivelent, not restrictor size into plenum or helmholtz resonator. the 24mm hole into the plenum can easily pass 2x the air that will pass through a 24 mm CARBURETTOR but you may not want a 24 mm carb in there but a 40mm throttlebody for example. The wording Carburation equivelent is what is in the current rules , no mention of a 24mm restrictor.

Your idea may well be what bucket people are looking for but maybe not

A 500 hp V8 can breathe through 2x 30.6mm restrictors, you may as well have no restriction

Toyota RV8KLM Specification
Designation: Toyota RV8KLM
Configuration: 90° V8
Displacement: 3400 cc
Valve Train Dual overhead camshaft with four valves per cylinder
Cylinder Block: Aluminium
Fuel: Petrol, specification according to ACO regulations
Weight: Approx 120kg
Power Over 500PS
Air Intake Restrictor 2 x 30.6mm
Engine Management: Pectel MQ12 ECU by Cosworth Electronics
Lubrication: Dry sump
Cooling: Water cooled

**F5 Dave** · 9th February 2016, 19:42

Why would anyone bother to race a 50 against 100s and 150s? Sounds silly to me. Oh.. . right.

I got excluded at an away meeting by a jobsworth (not that common in this bunch). I told him id just fitted my 55cc barrel so i wouldnt run in f5 for this meeting. He muttered, realised he was beaten and gave in.

**Skid Mark** · 9th February 2016, 19:46

Originally Posted by jasonu

No. What he is saying is read the fucking rules. it is all there.

Thanks jasonu
I have read the rules and a couple of derbi 49.9 is winning everything in f4 just wondering how that works if 55cc is starting limit not a silly question really for a bike that wins everything !!!

**F5 Dave** · 9th February 2016, 19:50

Ahh, aftermarket 80cc kit.

**TZ350** · 9th February 2016, 19:54

Originally Posted by Skid Mark

a couple of derbi 49.9 is winning everything in f4.

No ... Derbi 50's with big bore kits are.

**Yow Ling** · 9th February 2016, 19:57

Anything over 55cc is F4, is what he needs to hear

**TZ350** · 9th February 2016, 20:03

Originally Posted by Yow Ling

The wording Carburation equivelent is what is in the current rules , no mention of a 24mm restrictor.

Or throttle body, so that makes EFI suspect, maybe time to change that.

Originally Posted by Yow Ling

A 500 hp V8 can breathe through 2x 30.6mm restrictors, you may as well have no restriction.

I agree, trying to limit things by carburettor restriction is missguided.

I would regret the loss of all my legitimate development work and hard earned power advantages it has given me but would be happy if you submitted a proposal that did away with the carb restrictions in F4 and F5.

But if you do I pick nothing much in the hp stakes would change, those that do the work will reap the rewards and those that don't wont.

I have published everything and there is nothing I have done that others can't do too if they want too.

You are sort of faced with two choices, do the work or try and cut down others successes by fiddling with the rules.

**Skid Mark** · 9th February 2016, 20:11

Originally Posted by jasonu

No. What he is saying is read the fucking rules. it is all there.

So if your bike is fast enough you can break the written rules hello !!!

**TZ350** · 9th February 2016, 20:14

Originally Posted by Skid Mark

So if your bike is fast enough you can break the written rules hello !!!

Probably .... and if you can pilot your bike fast enough you are a hero, God like even, sadly I have never been there....

**Skid Mark** · 9th February 2016, 20:16

Aprilia derbi start life under 55c which means they don't meet your f4 rules

**Yow Ling** · 9th February 2016, 20:18

Originally Posted by Skid Mark

Aprilia derbi start life under 55c which means they don't meet your f4 rules

And TZ350 thought I was thick, take your ritalin and read the whole rule

**TZ350** · 9th February 2016, 20:21

Originally Posted by Skid Mark

Aprilia derbi start life under 55c which means they don't meet your f4 rules

That is sharp, why has anyone else not thought of that.....

**husaberg** · 9th February 2016, 20:23

Originally Posted by Skid Mark

Aprilia derbi start life under 55c which means they don't meet your f4 rules

It doesn't mater at what engine size it started life at, its what size it is on race day.
A plenty of bikes over the years have been destroked or debored. As well as bored or stroked.
You could if you felt inclined disconect a couple of cylinders and run a CBR250RR prefectly legallly if you so desired.
Or bore and or bore and stroke a 50. As long as it is over 55cc it is F4 class