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Need help: 50cc carb jet size?

This is a discussion on Need help: 50cc carb jet size? within the Chinese/Import Minis - General Discussion forums, part of the General Talk category; I have a chinese 50cc atv for my son.. I got it with less then an hour on it. It stumbles right off of idle. ...

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    Need help: 50cc carb jet size? PZ16

    I have a chinese 50cc atv for my son..



    I got it with less then an hour on it. It stumbles right off of idle. So far I went ahead and cleaned the carb. New open air filter and opened the exhaust up some. Top end is a little better but it still stumbles off of idle. I was going to put bigger jets in it but the ones in the carb are not marked. Any help with a good starting point would be great.


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    Re: Need help: 50cc carb jet size?

    It most likely doesn't need to be re-jetted. Just tune the air screw on the carb, most likely needs to come out and it should run fine, might need to go in. Play around with that first and see what it does. The bikes always come improperly tuned so try that first. Also figure out which carb is on it so people can help easier.

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    Re: Need help: 50cc carb jet size?

    See if you can find your carb among the ones shown HERE, that way everyone has a better idea of what you're working with.

    As stated above, air or fuel screw adjustment may be all you need. By identifying the carb, it can be determined whether or not the carb has an air screw or a fuel screw. Adjustments are the opposite of each other, depending on whether it's an air or fuel screw.
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    Re: Need help: 50cc carb jet size?

    Usually, an off-idle hesitation is a lean condition, and turning an air screw IN to richen it a 1/4-turn at a time helps get rid of the hesitation.
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    Re: Need help: 50cc carb jet size?

    Screw can be turned in all the way with very little difference. Tomorrow I will pull it out of the shed and get the carb info.. Its not like any other 50 carb I have seen. It has a second passage right beside the piston and needle.

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    Re: Need help: 50cc carb jet size?

    I just got the carb info from online. It is a PZ16 carb on the engine.. Does that haelp any.,

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    Re: Need help: 50cc carb jet size?

    Does it look like THIS ONE?
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    Re: Need help: 50cc carb jet size?

    Yes it looks like that exact one.

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    Re: Need help: 50cc carb jet size?

    Quite possibly you need to go up on the pilot jet, start with a baseline setting on the carb, and adjust from there.

    If you have adjusted the air screw (and it is an air screw, not a fuel screw) with no change, the pilot jet passages may still be clogged. Try cleaning the carb thoroughly with all the jets, adjustment screws, and the float and float needle removed. Use carb cleaner and compressed air to blow out all the passageways.

    The pilot jet kit from TrailBikes MAY work in your carb, depending on what your pilot jet looks like.



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    Re: Need help: 50cc carb jet size?

    I got it running a lot better now. I adjusted the carb again. It would run good then start to stumble. I found the choke was closing due to vibration. I put an external spring on it for now and it works perfect. It's surprising how much of a difference the exhaust and air box made.

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