How do you set the float height to specs?

[brewsky]

+1 on the hysteresis.

After installing clear tubes on my 750, I found there was a significant difference in the fuel levels after sitting with engine off vs running and idling.........so, just because the tubes show a given level with engine off, doesn't mean it holds true while operating.......which I ASSUME is the condition which the level is designed for?

Add in the level changing due to vibration, bumps and curves in the road, accel and decel, the level may look more like a washing machine than a lake inside the bowl?

[Snakeoil]

Well, with a night's sleep I think that although doing measurements might lend some insight, in reality, actual flows for the jets and the incoming fuel supply would have to be known in order to determine what the correct fuel level needs to be so that the pilot circuit is never starved. But, that may be over-complicating it and the level may simply be established by avoiding it ever going above the bore when mounted on the bike.

Something I noticed before I used LM's method of setting the floats to the top of the jet holder, was I always had small collection of gasoline under my bike when I parked it. It was coming out the overflow tubes. That was when I used the top of the rim to set the float height. Since using LM's method, and removing the overflow tubes per his suggestion, I don't get that any longer. So, the H measurement may be as simple as the top of overflow tube minus some margin, say 1mm.

I have to admit that I got all wrapped up in this because in all the years I've monkeyed with bikes, cars and engines, I've never really paid much attention to the details of carb design since shop class in highschool. Setting a float to specs was never a vague topic like it is if you try to use the verbiage and diagrams for our carbs in the manuals, which seem to conflict at times. So, other than dirt inside of carbs or worn out carbs, if they are jetted right and set up right, they work.

But after all this, I think you can safely raise the float height in the carbs until either you get fuel out the overflow tubes or your idle gets very rich.

Thanks for the offer, G-man. But I'm good for now. And I have to say that the NOS carb with it's pretty gold cad plate sure is a pretty little thing.

regards,
Rob