Expert RS36 Float Level Advice Needed Please!

Bought the tool...


Used the tool...but :huh:


All four are the same, 4mm - 5mm above the bowl mating surface. So, what's the deal?
I followed the owners manual procedure and carefully set the four floats to 17mm with the carbs upside-down...and this is what I get? :blink:
After thinking about it, maybe its supposed to be like that, since this set of carbs has a pump that squirts fuel into the bore, and the pump bowl gasket is cut next to the plunger...hmmm. Is that where the fuel feeds into the pump system, and if so then I think the fuel level needs to be above the bowl surface rather than below it?


Then what about the overflow tube? Fuel enters it at 6.5mm +/- above the top of the bowl, so I've got about 2mm to spare with the levels as-checked.


If it is supposed to be this way, then I'm rock'n baby! Otherwise... :S

Looks like you got it.
Steve

swest wrote: Looks like you got it.
Steve

Do you mean like its meant to be?

If the overflow is that high, it'd have to be.
Steve

Apparently it isn't standard procedure to use the clear-tube method to float check on the RS series carbs. Please correct me if I'm wrong.
Shoot, Z1E didn't know if the tool would even fit in the drain hole. After a brief and determined phone conversation with Jeff and his set of calipers, I decided to give it a shot. Sure enough, it fits perfectly in the hole and over the jet.

But its the level reading I'm flummoxed over.

daveo wrote: Apparently it isn't standard procedure to use the clear-tube method to float check on the RS series carbs. Please correct me if I'm wrong.
Shoot, Z1E didn't know if the tool would even fit in the drain hole. After a brief and determined phone conversation with Jeff and his set of calipers, I decided to give it a shot. Sure enough, it fits perfectly in the hole and over the jet.

But its the level reading I'm flummoxed over.

Sudco, imho, ought to have also provided a fuel level specification for the RS series that's verifiable by the clear tube test, instead of just informing about "Float Level Adjustments" set by bending the actuator tab.

To me, it seems axiomatic that a carb with a float having a bendable tang depends on functioning of the float assembly to maintain whatever ideal fuel level the float bowl is supposed to contain.

When plugs quickly become black and sooty and fuel-fouled to the extent of failing to fire, and other carb settings are known to be correct, it's a likely bet that the fuel levels are too high, regardless of supposedly precise "Float Level Adjustments."

Good Fortune!

I can't imagine fuel level actually needing to be that high. The accelerator pump feeds from low in the bowl, and the vent should be high enough to keep fuel from constantly sloshing out.

My clear tube tool showed up today. I'll check levels tomorrow, but the floats were all set at closer to 25mm than 17.

Daveo, are you using gasoline for the tests? The liquid in your pics looks much more clear than the gas around here. . .

Patton wrote: Sudco, imho, ought to have also provided a fuel level specification for the RS series that's verifiable by the clear tube test, instead of just informing about "Float Level Adjustments" set by bending the actuator tab.
Good Fortune!

It would certainly seem-so. :huh:
Can't seem to find definitive clear tube float level information for the RS carbs anywhere.
There was a specific post devoted to the subject here years ago, but it devolved into a discussion about jets and needles, and never actually resolved the question...no follow up posts with results and recommendations since, which really strikes me as odd with the growing popularity of these carbs.
www.kzrider.com/forum/3-carburetor/44768...es-help?limitstart=0

retterath wrote: I can't imagine fuel level actually needing to be that high. The accelerator pump feeds from low in the bowl, and the vent should be high enough to keep fuel from constantly sloshing out.

My clear tube tool showed up today. I'll check levels tomorrow, but the floats were all set at closer to 25mm than 17.

Daveo, are you using gasoline for the tests? The liquid in your pics looks much more clear than the gas around here. . .

How come your floats were set at 25mm, when the manual specifies 17mm? :ohmy:
Please share your "clear-tube test" findings with us...

I set my gas tank on an elevated surface behind the carbs, and hook the fuel line directly to the petcock, which is used to regulate the fuel flow (on/off) between each float level check.

There is a tuning manual download on this page.
Steve
www.mikuni.com/fs-manuals.html

swest wrote: There is a tuning manual download on this page.
Steve
www.mikuni.com/fs-manuals.html

Thanks Steve,
Not a single reference to the highly-recommended "clear-tube method" whatsoever.
Help please

I'd set a reference point then set them all at that point with the clear tube test. Measuring them is like shooting in the dark.
Steve