Hi people,

i am getting to the last few bits of my NC30 racebike for this seasons racing. im runnig a full HRC exhaust system and a hrc rep air scope (open carbs with no filter) and total loss, but apart from that it is standard.

what jet sizes would you people recommend and is there anything else i should do to the carbs?

what pads do you recommend for standard calipers?

what gearing do you race lads run at mallory park?

any help would be great thanks

Andrew

I reckon you will need to spend the money and get it dyno'd to make sure of a good setup on them carbs,

You know the BMC gang, I'd recommend you let Mike loose on it for an hour or 2 and get it dialled in. Have you bought the HRC kit for the carbs? What you doing for the trumpets or to shiels the air jet?? Can we get some pics of the setup?
Jetting on open carbs is a bastard..as I was going to run it like that last year and I ended up sacking it and ran std airbox and it fuelled lovely. Open carbs is not as simple as just not running a filter

Gearing - 14/41 is pretty much bob on.

CMSMJ1 wrote: Have you bought the HRC kit for the carbs?

Open carbs is not as simple as just not running a filter

If you don't have the rest of the hrc gear in the carbs (emulsion tubes, pilot jets, needles, velocity stacks, etc) then you'll need 160+ size jets and it will run like a pig with a massive midrange hole that will be hard to get the bike to rev through.

With all the right parts the power delivery is peaches and cream smooth with good top end power!

The TT F3 manual lists all the carb parts, most can be had (or replicas) plus some work arounds done (particularly regarding the velocity stacks - quite rare now):
http://www.400greybike.com/docs.htm

thanks for your help guys. i am going to run standard airbox to get the bike on the track. do you have an idea of what jet sizes i will need running the standard airbox with the HRC exhaust system? thanks for help

I run 120s with a full system and std airbox. It is lovely..should get you thereabouts anyways!!

CMSMJ1 wrote:I run 120s with a full system and std airbox. It is lovely..should get you thereabouts anyways!!

Good call..

What air-filter do you plan on running with the bike?