Why use NC30 carbs in a 35 race bike?

[skinnydog0_0]

Hi all,
I notice a few people use NC30 carbs on their NC35s' why is that?
Cheers

[Drunkn Munky]

there bigger

[skinnydog0_0]

Thanks DM,
Doesn't the fact that the 35 carbs have straighter inlet air tracts make them flow better or is size all important?

[Old Painless]

As with engines, there is no substitute for sheer size.

[Drunkn Munky]

Your find that most 30 carbs that are used on race bikes have almost non existant inlet stacks compared to standard ones, im not 100% if there cut flush with the carb or small rubber boots are fitted instead, dont think i have any pictures of mine to show you what i mean but im sure someone will be along shortly with a pic.

[skinnydog0_0]

Thanks fellers,
I guess there is no substitute for size, bigger is better
Do you jet 30 carbs bigger as they flow more air?

[Drunkn Munky]

Theres so many varibles when tuning/jetting NC carbs, do your research, decide on a setup(HRC, ram air, open carb etc etc) and you should find enough info on here do give a good baseline setting. To give you some idea of sizing the 30 carbs on my 35 run 144 front and 148 rear jets using ram air, thats no filter either.

[skinnydog0_0]

Thanks DM,
I will start with the 120 jets i currently run, and standard airbox, and see how it goes. I will look into the open airbox and ram air, but i think i will get a few more miles under my belt before i go for full race spec carbs

[royster81]

i have 122.5 jets for sale if you need something just a little bigger

[skinnydog0_0]

i have 122.5 jets for sale if you need something just a little bigger

Thanks Royster, i may well take you up on that offer, how much do you want for them?
I will run tham standard jets first and see how it goes. them go up from there, cos i reckon it will need to be up-jetted.
On a side note (sort of) i have noticed that the exhaust has quite alot of carbon in the end of the can, but the plugs look spot on. Is there a reason why it would look like it's running rich in the exhaust(being black with soot) but the plugs are a lovely buiscuit brown?