float levels

[cruisecraft]

hi i have a 98 130hp yamaha just wondering if any1 knows the correct float levels for the carbs and how to measure them any info would be great thnx

[Sparkieboat]

I have always set my floats so that they are level when you turn the carb upside down. this may not be correct..but it is how i have always done it.

[rodbolt17]

float bowl gasket in place, carb upside down.
from the gasket to the top edge of the float, about .620" plus or minus about .05".

[200090tlry]

How can you set level?

Doesnt the float just go up and down and have free motion? Going to take mine apart some day.

[rodbolt17]

the floats control the level of fuel in the fuel bowl.
to high and it runs rich to low and its lean.
I would suggest some reading to actually lean how and why a carburator actually functions.

[robert graham]

A lot like the float in the back chamber of a toilet, but a lot more critical regarding fluid level.

[BazzaDee]

I think the Yamaha manual specifies 0.630" +/-0.020" (16.0 +/-0.5 mm). Floats installed, housing upside down measured from top of float opposite to pivot side down to housing wall with gasket removed.
Makes a huge difference to engine handling if you ask me, mine was set too low from last service and struggled to start - particularly if motor was not trimmed all the way down. When I checked mine they were set at 19 mm, since the correction starts fine!
Hope this helps!

[cruisecraft]

thanks ill give it a go tommorow and let u know how i go

[rodbolt17]

all good, EXCEPT, float gasket is INSTALLED when checking float height.

[touche1234]

Touche1234

How does one adjust the float level on the 50---90 2/s carbs????????????

[99yam40]

bend the tab , but be careful not to hurt the needle tip