float hights

[emshwillerstech]

does any one happen to know what the float hights are for a 79 XS1100SF is, the carbs are Mikuni BS34-II. having trouble with a flooding problem, to much fuel and wont idiel down once you twist the throtle just put new floats in and think they are to high.

[trbig]

It could be the floats.... but sounds more like you just need to synchronize the carbs. Does fuel run out of your airbox? (Float pin not seating) Usually if it won't idle back down, you have one or more carbs out of synch and dragging the others with it.

Tod

[cafexs1100]

A motorcycle mechanic of 25 years uses a clear tube. He puts it on the bottom of the carb drain, unscrews the drain so the gas runs into the clear line. Route the line up next to the carb in the verticle position so that it is pointing up in the air but still next to the carb - ie the gas is making a 180 from the downward to the upward direction. The gas will settle somplace around the top of the bottom cover of the carb bowl. The gas should be a little below the bottom, if its too high it will go out of the carbs, if its too low you will run it out of gas. The easiest way to tell is to test them all and you can easily determine which one is too high or low in relative position to the others. You have to bend the flat shiny metal peice between the prongs on the float to adjust - go easy because a little movement makes a big difference. See your manual or another discussion for a diagram , not sure if theres one on this forum.

[mro]

There you go again!

The earlier models state to use the 25mm setting, but the 80 states to use 23mm, and the 81 to use the float bowl tubing fluid trick, so I would use the 23mm setting, IMHO!
T.C.

Above from one of TopCats posts

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check both sides of each float

Also a post in Tech Tips at left showing how to use clear hoses to see that all four carbs are set the same. I've not done this, my 80G runs just fine when I used a caliper to set float height and then sync'ed the carbs after.


mro

[81xsproject]

I had the "wont idle down problem" and my floats were too high." I replaced the needles at the same time and the problem went away. I later did the sync and that made a nice difference too.

[DiverRay]

I would set the floats to 25mm. The 23 mm is 2mm more fuel, and a little higher in the carb. I think mine are running at almost 27mm now, but I'm going to have to lower them 1mm. Be sure you check ALL the floats, and keep them the same.
Ray