650 Turbo - float height - once more. Is it 1, 2 or 3.

If you use the clear tube metod to measure the float level, is it the same marks as on the picture, when we're talking about Turbo carburettors.
By the way i fired her up today after 11 years - started right away. But all carburettor settings have to be adjusted.

 

Re: 650 Turbo - float height

Yes. And for your carbs the spec is:

2mm +/- 1mm (.08 +/- .04 inches)

 

Re: 650 Turbo - float height

Where does the 2mm start from?

 

Re: 650 Turbo - float height

From the base of the carb BODY to the fuel level in the tube.

 

Re: 650 Turbo - float height

Sorry ahead of time for thread jacking a little. But you posted such a beautiful diagram.


The bowls on the 650 turbo must be considerably different than the 750 or that diagram is misleading.

The lip on my bowl (the space between the base of the screw head and the carb body) is almost 6 mm.

I can't seem to find it but I remember seeing a similar if not the same diagram for setting the 750 float levels. If I set my levels according to this diagram I would be getting float levels around 8 to 10 mm below the carb body.

 

Re: 650 Turbo - float height

As far as I'm aware, all of the Hitachi and Mikuni carbs used on the XJ series of bikes have a fuel level specification that takes its reference point as the bottom of the carb BODY, where the float bowl mates against the carb body.

Note that the bottom of the carb body is actually a bit lower than the top of the float bowl (when installed), as the top of the float bowl---its mating surface---actually tucks up "into" the bottom recessed, mating surface of the carb body.

The float level measurements of 2.0 +/- 1mm (etc......it varies by carb model) are measured from the base of the carb BODY, not from the float bowl screw head, screw head base, etc.


Also, you should ALWAYS set your fuel level by measuring the fuel level itself (via the sight tube method as illustrated in that diagram, even though the bottom-of-the-carb-body measurement reference point is not shown, or shown correctly), and not by the "float height". The "proper" float height for any set of carbs is the "float height" that achieves the correct float bowl internal fuel level as measured by the clear-tube method.

 

Re: 650 Turbo - float height - once more

So! no more confusion. Is it #1, #2 or #3 which i the base where you do the measurement? I think it's #1 but I'm not shure.

 

I'm going to guess #1, but the factory 650 Turbo manual makes no mention of which on is the correct reference point!