NC30 Race Bike Carb Setup

[Bike_Nut]

Hi All

As I mentioned in a previous thread I bought a race bike, initially with the intention of taking off the 17" rear wheel, the technoflex shock and the new EBC disks and then selling it on again, but im loving the idea of a dedicated track day bike so now concidering keeping it, at least for this summer (I change bikes as often as I change underwear, well almost)

First thing that started happening was the bike is flooding and not starting, which has prompted me to look over its settings as getting to a trackday with a bike that wont run is not fun and a huge waste of money.

Bike as it stands:
No airfilter
Standard lower airbox has been trimmed, the bit that forms the wall to stop air being forced into the airbox.
Standard needles (J51?) raised by 1 washer
114f/116r main jets.
Race can
Pilot screws only 1.25 turns out.
Bike came with a dyno readout showing 61hp (mmm I wonder)

My concerns are:
No filter and modified air intake - I would imagine this would drastically affect the mixture, and doubt those jets will be big enough.
Pilot screw setting.

What I did today was check the float height (pretty much 6.8mm) and set the pilot screw to 2.25 turns out, then fit an old filter I had lying about (not ideal but should give me a better baseline than nothing.

The bike was still not happy starting and flooded the first time, will see if it starts tomorrow now that the idle has been reset. After it had warmed up I blipped the throttle, but noticed a massive hesitation around the 8000rpm mark which worries me.

Does anyone agree that I should try seal up the area below the snorkel, or would an hrc style tray be a better idea? Am I at least heading in the right direction?

[dave6970]

My NC30 had the same problem with flooding and the 8000rpm hesitation and was really hard to start. turned out to be that all 4 float needle valves were worn out which let petrol past them and into the float bowls, so setting the float height made no difference. Once they were changed the bike was transformed, no flooding no hesitation . Hope this helps. :)

[Bike_Nut]

I was expecting to see the same but 3 of them looked brand new, not a mark on them. The 4th float bowl had a damaged screw so wanted to get my impact driver on it and not damage it (good nibs not going to hit it lol). But looking at the others I dont think that is the problem.

[Bike_Nut]

Bike started on the button this morning so either the pilot screw setting or the cleaning needle and seats has made a difference.

Think I now need to find a standard airbox and fit the usual 118f/120r jets, as a standard setup that runs nicely will be more fun than stripping carbs when I should be riding.