Bigger carb for 390xp

[Jake Dykstra]

Looking to get more air into my 390xp bb.
What carb should I be looking for?
Wanna big sumbitch for it.
Maybe 084 or something like that?

Thanks

 

[farminkarman]

Looking to get more air into my 390xp bb.
What carb should I be looking for?
Wanna big sumbitch for it.
Maybe 084 or something like that?

Thanks

RWJ carb would be what I would try first. Basically a drop-in. If a bigger carb is actually needed, it should provide more top end.

 

[Jake Dykstra]

RWJ carb would be what I would try first. Basically a drop-in. If a bigger carb is actually needed, it should provide more top end.

Well being that it's 94.4cc now and has a carb that is basically a 372xp carb I would think it would benefit greatly. But I'm just a dumb hack of a saw mech so could be way off.
That said I do like the ease of the rwj and will try it for sure. But Being only a couple mm bigger I don't expect huge gains but should help.

 

[farminkarman]

Well being that it's 94.4cc now and has a carb that is basically a 372xp carb I would think it would benefit greatly. But I'm just a dumb hack of a saw mech so could be way off.
That said I do like the ease of the rwj and will try it for sure. But Being only a couple mm bigger I don't expect huge gains but should help.

Well, a 390 carb will support pretty good power numbers…like 9.5 - 10hp. There is more to it than just Venturi size. An RWJ will allow more air at the expense of some manners.