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Screw Kit Set

Screw Kit Set

Honda Z50 Carb, Throttle and High Rev?

Hello,
I just picked up a Z50 K5 that wouldn't start so I bought a Carb rebuild kit and rebuilt it, put in a new plug and it started right up on the first kick. For some reason when I open up the choke (slide lever down) the engine revs really high and when I adjust the Pilot screw or the air screw there is no change. I also swaped out the throttle cable because the original was all freyed and and now when I rev the throttle nothing happens. I have the Pilot screw and air screw set to 1.5 turns.

Please help.

The pilot and air screws aren't the problem because it's revving so high that the main jet has taken over. Adjustment and cable routing are crucial on these things. There should be an adjustment mechanism right on top of the carb. Make sure the cable is seated correctly in it, screw it all the way in, then gradually screw it out until the slack at the twistgrip is taken out. Make sure the top of the carb is screwed on tight and not cross-threaded. (Don't laugh, it's happened). Is the cable the right length - especially the inner? The way the carb-end of the cable is attached to the throttle slide means the cable can actually poke out of the little groove on the side of the slide and into the chamber by about 1/8" sometimes, hence restricting throttle response. Make sure the cable hasn't come out of it's lughole at the throttle end too. That's about all I can remember after 35 years!

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