This is to accomodate the passages for the main and pilot jets inside the float bowl. In the picture showing the rebuild parts for a KZ750B note the odd float bowl gasket with all the holes in the middle. They look like very small air jets and are frequently stripped as they require the correct sized small screwdriver to remove. The pilot jets used are standard BS series fare in that they are Mikuni BS30/96 type but the main jets are unique to Kawasaki BS38 carburetor assemblies. A good bowl gasket is critical because gas is drawn from the jets into the internal passages that lead to the venturi via channels beneath the gasket inside the float chamber. The biggest oddity is that the Kawasaki version of the BS38 uses a system where both the pilot jet and main jet are screwed into the float bowl. These assemblies are probably the heaviest twin-carb assemblies ever built and have a couple unique features. For the first four years of production (1976-79), the KZ750B1 through B4 shared identical Mikuni BS38 carburetor assemblies. Please Log in or Create an account to join the conversation.The first Kawasaki KZ750 twin was built in 1975 and sold as a 1976 model as a KZ750B1. So I'm going to put the jet plugs back (when they arrive on Thursday), but I figured I would do are more thorough cleaning job however, in that the bike ran pretty good aside from what I think is the plug issue, I'm not looking to max out on the tear down mistake?

The reason I'm taking the carbs off again (just had them off) is that I didn't put back the pilot jet plugs but the bike started great and ran great.until the combination of over 1/2 throttle over 4,000 rpm then it would start coughing and slow down if I backed off the throttle it would be fine up to red-line. A clean work area is helpful & 4 small parts containers are good for keeping things organized. Instead of bothering w going back-n-forth referencing the manual, I just used my eyeballs & common sense to get them apart.

I did a set of VM carbs for the first time several years ago, and it really seemed quite easy to me. A lot of the same thing is done four times & most stuff only goes back together one way. Doing so should take care of any problem orifices that might be plugged.ĭoing so isn't that bad. May I suggest going ahead & doing the complete teardown so that the carb bodies can be soaked.

Mikuni bs34 carburetor manual