A note on the manifold clamps. Kawasaki KZ-750, XS500 Carburetor Diaphragms for Mikuni BS38, BS36, BS34, BS34SS.After some searching I found a very nice description of the mixture screw on XS650forum.com bu 5twins, as follows :carbs certainly popped into my new soft manifolds easier than they pulled out of the old hard ones. Some of the smaller, new, aftermarket carbs, like the VM18-144, still use this type of float, but youre more likely to see floats like this on 1970s era two-strokes from Yamaha, Kawasaki and Suzuki.The rubber boots between the carbs and airbox are often in the poorest. Most vintage, OEM Mikuni, round-slide carbs, have a pair of bronze-alloy floats soldered to a float arm.
On the BS34s, it can be altered by changing the pilot jet size and/or the size of the air jet that feeds it.The air/fuel mix from the pilot jet is delivered into the main bore through 4 tiny holes. The strength of that mix can be altered by changing the pilot jet size on the BS38s. If it is located between the slide and the air filter, it is an air regulating screw.The 650 mix screw regulates the all ready made air/fuel mix that comes from the pilot jet.
By 5 or 6 turns I had a smooth idle at 1000 rpm. 25% of the feed from the pilot jet.I am pretty sure my 78 gets richer with the screws turned out.I have pods, free-flowing exhaust, and the bike wouldn't even start until I turned the screws out 4 times. The mix screw gives you control and adjustment over approx. The 4th hole is off to the side (BS38) or ahead (BS34) of the 3 others and is the regulated feed from the mix screw. Whatever mix the jet sizes are producing will come out here. These flow directly from the pilot jet and are unregulated.
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Apparently they are supposed to look slightly yellow in color with no significant film or deposition. If it is running too lean they will probably be quite clean/white and may blister due to the overheating that tends to occur. If it has black sooty carbon deposits or is wet with gasoline (not oil) it is running too rich. Once it has been running for a bit pull the plugs and take a gander.
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