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Installation of Carburetor: Z50

This is the "W" clip that lives down in the throttle slide. If you ever take the needle out & can't figure out how it goes back in, this is the way. It must be all the way down in the slide or the needle will have up & down movement. To make sure that you have it all the way down, give the pointy end of the needle a VERY light tap. It should not come up at all. It will wobble a bit  & that's normal, but it should not come up at all.

Cable End

If you purchased the Z50 Retrofit Carb kit from me, you may notice (depending on what version you have)  that there is an additional rubber line coming off the right side (as you are seated on the bike) of the carburetor. If so, that is an additional carburetor atmospheric line that your original carb did not have & is best routed in the manner shown. Being that it is an atmospheric line (as opposed to a breather line) it does not really pull in or expel anything, it simply allows the carb internals to move freely and not be subject to vacuum or pressure. That being the case, the line does not need to be filtered. It just needs to be open to the outside world.

Also, i like to orient the carb atmospheric line so that it sits with the beveled edge facing downward, as shown here. It's not terribly critical, but i would rather the end of the line at the back of the engine with the beveled edge facing downward. This is easily achievable by gently affixing the carb vent line to the engine breather line & then rotating the carb atmospheric line at the carb, so that the line twists accordingly.

Gently affix the atmospheric line to the engine crankcase breather line as shown, with some zip ties. Don't tighten the zip ties any more than necessary, just enough to hold the 2 lines together, or you will risk restricting the lines.

BREAK IN THE ENGINE SLOWLY Add fresh gas, then start bike and hold engine at a fast idle. Never allow a
newly built engine to sit at idle, use cooling fans pointed directly at the engine to control heat buildup.

RIDE THE BIKE Run through the gears, accelerating slowly. Do not over-rev or lug the engine. Ride for about 20
minutes, then shut down and allow engine to cool completely. Do this heat cycle 2 more times.