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Message started by DrunkenDwarf on 07/31/09 at 17:37:53

Title: Carburettor theory
Post by DrunkenDwarf on 07/31/09 at 17:37:53

I'm following the advice of "SV og LS" and reading Haynes Motorcycle Fuel Systems Techbook (http://www.haynes.com/products/sfID1/8/sfID2/36/productID/55).

I've run across a formula where they talk about jet area.

Does anyone know the diameter of the main jets based on size?
Does anyone know the diameter of the stock needle jet?
Does anyone know the diameter of the stock needle?

-D. Dwarf

Title: Re: Carburettor theory
Post by Serowbot on 07/31/09 at 22:26:57

Is this any help?....

http://www.angelfire.com/pa5/cannondale/Mikunivs.dynojet.html

http://faq.ninja250.org/wiki/Dynojet_-_Mikuni_-_Keihin_jet_sizes_conversion

Title: Re: Carburettor theory
Post by DrunkenDwarf on 08/01/09 at 06:09:17

Serobot, thanks for the attempt...

2137203D25303D26520 wrote:

Is this any help?....

http://www.angelfire.com/pa5/cannondale/Mikunivs.dynojet.html

I've seen this chart reproduced on a dozen different sites. Since no one seems to know where it comes from or how it was created, I'm a bit skeptical.

See also: Road Star Clinic (http://roadstarclinic.com/content/view/61/96/)

This page (http://rd500lc.free.fr/technics/jet_size_en.htm) suggests that even if the Mikuni label is supposed to represent flow rate, it doesn't do a very good job.

2137203D25303D26520 wrote:

http://faq.ninja250.org/wiki/Dynojet_-_Mikuni_-_Keihin_jet_sizes_conversion

I hadn't seen that one. Thanks.
Unfortunately, the jets they size are between our pilot and main. I could try to extrapolate, but I doubt it would be usable information.

-D. Dwarf