JS550 Fuel Line Restrictor

[Supercowcc]

So I bought a JS550 that's been modded to the tee only thing that it'll need is a 44mm carb. But until then... The rev limiter has been removed and I hear that on the return line you need a Restrictor so it slows the flow of fuel back to the tank so the engine doesn't run lean. How should I go about doing that? I heard a .03" brass fitting?

[john zigler]

yes, you will need a restrictor of some sort. you can either make one, or i have in line RIVA ones here that are tuneable, it has a mikuni main jet, that is replaceable. it comes with a 115. 17.00 + s&h

please email, or call if i can help.

[DrewNJ]

An easy way to accomplish this is to use a 1/4" plastic barbed fitting and screw in the Mikuni main jet of your choice.

[Myself]

The fuel line is small enough you can probably just shove a jet into the return line right after the carb. I would try a Mikuni #90, maybe even smaller.