Xj650 turbo float height

I’m looking at my float height recently as I see to be running rich and i checked the wet height and it is slightly above the bowl, I was wondering what the float height was for the turbo as I see it being 21.5 or 17.5, and where to measure the dry height from, where the metal arm attaches to the plastic or the step below it where it’s all plastic?

 

Couple things:

1. from Len’s pages

Mikuni BS30 (all XJ650 Turbo):

-Fuel level measured via the clear-tube gauge: 2mm +/- 1mm (.08 +/- .04 inches)

-Float height: 21.0 +/- 0.5mm

2. Floats
You said plastic floats……. Do you really mean “black hard shiny plastic floats”? That’s aftermarket cheapo stuff. It MAY float the same, it may not, so all bets are off.

if you mean the “duller black sealed foam” floats, ok, these are original. Go with the 21.0mm dry height to start with.

 

they’re the original ones, should’ve clarified that, i was not sure where to measure from as im seeing different things online, from the photo attached is the 21 mm from point A the main body of the float, or point B, the point of the float where the arm attaches to it? I know to measure from the body of the carb, but not sure which part of the float for the top measurement.

 

That is only a rough setting to get you close, not the final adjustment. You will need to do a wet set to get an accurate setting. I don't do a dry set because it will change with wet.

 

I’ll be doing a wet set with fuel pump pressure and everything but I wanna have it about where it needs to be, then do the wet set

 

Height measurement is at the top of the round part

 

If you have any sense you will make a stand to mount them for wet checking, otherwise you might well get a sense of humor failure. Set them all identical dry, that way in theory the wet adjustment should be the same on each, but still needs checking with clear tube.

 

I ended up doing exactly this, wet height was right and I set the dry height the same, checked the wet height again on all and it’s good! runs perfect, now all I need is a turbocharger rebuild eventually and the bikes ready!