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Post Info TOPIC: Anybody Know of Aftermarket Jetting


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Anybody Know of Aftermarket Jetting

I want to go up jet sizes on my 1999 ttr250. Wanting to know of any good jet brands and what size to use for the teikei y30p carb. Any help is appreciated thanks. I am planning on getting an fmf powercore 4 And a k&n air filter also

-- Edited by TTR250RIDER on Monday 30th of May 2016 05:30:19 AM


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Posts: 53

Flick thru the Carb section sticky's, they give what type of jets fit it.
As for what size, no idea for where you live sorry.



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Posts: 625

My setup.
Mikuni jets.
Pilot jet 52.5 (vm28/486)
Main jet 140 (n102/221)
Idle mixture screw 3 turns out.
Twin air foam filter.
Snorkel removed and airbox opened up.
Aftermarket exhaust. ( White Brothers E series).

It runs sweet and the revs pick up quicker than standard.

Beware that the Powercore 4 is very loud


2004 TTR250. White Brothers E series exhaust, modded airbox, rejetted, 13/48 c&s & many more mods..

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