Float height for GS750B

[gssuzukixxx]

I have taken all my carbs apart and cleaned them and set all the floats to 26mm from gasket base to bottom of float with carb. upside down. This is what my hayne manuals says. Can anyone confirm this is correct.

The reason I doubt is that all the floats had to be changed from about 23-24mm.

Thanks in advance
Brian

[Nessism]

The factory GS750 manual says 26mm, but those early manuals where known to have some mistakes. Both the 850 and 1000 manuals say 24mm, and the carbs are the same as the 750, so I'd go with 24mm.

[tkent02]

was it too rich before at 23-24?
26 will be leaner.

[gssuzukixxx]

I don't know...I bought it as a non-runner. But I will say this, I had it running this morning and it would only run with the choke on so maybe the lower fuel level is causing this.

I have the carbs off again because of a leak issue so it would be easy to change the float level back to 24mm.

Brian

[tkent02]

Richer is better than leaner for now until you get it running, once everything else is working perfectly you can fine tune it.

[Coady]

http://motorbikearchives.com/Bike-Te...50EN-1979.html

According to this link the GS750B had a float height of 26mm which was then changed to 24mm for the GS750N.

But all the manuals have slightly different figures as you may have found.

[TheCafeKid]

The factory GS750 manual says 26mm, but those early manuals where known to have some mistakes. Both the 850 and 1000 manuals say 24mm, and the carbs are the same as the 750, so I'd go with 24mm.

The 750B had a few distinct differences in the carburetors. I'd go with the 26mm FIRST...decide if that isnt working, then change it. I have used 26mm on my 750B carb rebuilds and found it to work perfectly. The most evident difference is that the needles are not spring loaded. They sit flush in the bottom of the slide. Thus they will be longer on the pilot/needle transition which MIGHT be a reason for the leaner setting on the floats...just a theory, im no carb expert. Just my .02

[gssuzukixxx]

Thanks for the helpful responses.

Another thing; the float needles have a spring loaded thing that the float pushs on. Should I be measuring with the float resting on the top of the needle (with the carb upsidedown) or should I push the float down to take up the spring travel?

I have them on the bench and I plan to set them all at 24mm float height.

Brian

[tempebru]

Float level should be taken with the float resting on the needle and NOT depressing the spring. I will sometimes hold the carb at an angle and measure the level just to make sure that the weight of the float has not caused me to set the float to the wrong height.

[gssuzukixxx]

Coady,

What I find a little troubling is that they say the GS750B had a float height of 26mm and then was lowered to 24mm to meet emission standards. I would assume they wanted to made is leaner so they lowered the fuel level.

I am measuring the float height with the carbs upsidedown and measuring from the gasket base to the top (bottom with carb rightside up) of the float. So the lower the measurement the higher the fuel level.

Am I missing something here?

Brian

[tkent02]

Coady,

What I find a little troubling is that they say the GS750B had a float height of 26mm and then was lowered to 24mm to meet emission standards. I would assume they wanted to made is leaner so they lowered the fuel level.

I am measuring the float height with the carbs upsidedown and measuring from the gasket base to the top (bottom with carb rightside up) of the float. So the lower the measurement the higher the fuel level.

Am I missing something here?

Brian

You are right, but I think they changed out all the jets at the same time as they made the float height change, the newer ones are leaner overall...