Double Jetting, with Carb's - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 1 (permalink) Old 05-23-2008, 08:41 AM Thread Starter
Join Date: May 2008
Posts: 1
Double Jetting, with Carb's

Hi, this idea came with a solution used on the cbr 600rr, the DSFI (Dual Stage Fuel Injection). The idea is using a similar scheme but with regular carbs.

The Bike is a CBR 125R 06, and the point is adding an air trumpet, twin ram air ducts to the air box, and a fuel line and venturi-based valve, so that at higher rpm's and speed, the air passing trough the trumpet forces fuel trough the venturi-based valve.

Like in this scheme:

The venturi-based valve, is simple a small cone pointing against the air dirrection, so that when the air passes, it creates a depression that forces fuel out.

The trumpet is a short-tipe (length=diameter), wich is used for high rev's.

My biggest issue here, is about tuning the carb, because obviously the engine will be receiving more gas, but according to the design it should only receive that extra amount of gas from 6000 our 8500 rpm's (the engine goes to 12000), and I'm not an expert doing that so...

What do you think/advise?

Should I change the jet/gigleurs of the original carb so the mod will work properly?

What kind of tuning will the carb need?

What other mods should I do, so that the idea works properly?
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