ADJUSTABLE MAIN JET

[dumper_uk]

Saw this on Ebay..Does anyone know if they are any good?

ADJUSTABLE MAIN JET for 2 strokes, Mikuni, Keihin, 250r

Ebay link

[wesw]

if it works it would be a cool idea or thing to have

[dajogejr]

Looks like they're trying to copy dial-a-jet's system.

 

If it sounds too good/too cheap to be true, it usually is.

 

http://www.thunderproducts.com/dial_a_jet.htm

[03bansheeLE]

how would that work cause you main jet is in the bottom of the carb not the top.

[dajogejr]

It sprays additional fuel into the venturi to compensate for a lean main jet.

It gets this fuel from the bowl.

 

However, how it "Leans" it out...I don't know....might have to ask a fellow dial a jet user...

[Tim C]

You put a smaller main jet in and then the dial-a-jet puts the rest in to the carb. It sucks fuel from the bowl up to the dial-a-jet. I have Vito's version of it and it works good.

[dajogejr]

Kinda what I figured. Start lean on the main, then let the dial richen it up.

 

Thanks...much!! Good info to know!

[BANSHEE_JAY]

SO are you saying even if you have a smaller jet that is running lean the dial a jet will richen it up on its own without any tinkering?

[dajogejr]

No...it is not automatic.

Only automatic is fuel injection.

I'm sure there's a knob to turn or screw to turn to adjust it.

Still way easier than draining and removing the bowls...though...

[Tim C]

You adjust the dial-a-jet to fine tune the jetting by turning the dial. So you don't have to go through the bother of changing main jets