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Old 09-11-2012, 08:47 AM
keithert's Avatar
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Default Needs choke to run

My son's 90cc ATV with a PZ-21 carb won't run without choke. I put on a new carb a year and a half ago. Does it likely just need a new jet from a rebuilt kit?
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Old 09-13-2012, 11:11 AM
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have you tried cleaning it first?
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Old 09-13-2012, 11:19 AM
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I've put Seafoam in the gas and also sprayed carb cleaner into the carb. I have not removed the jet and tried to clean it. I'll have to try that but haven't had good luck with cleaning them in the past. Thought it might be more worthwhile to just replace the jet.
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Old 09-13-2012, 11:30 AM
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so the carb ran great for 18 months and now it's acting up?
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Old 09-13-2012, 11:34 AM
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Pretty much. It's been getting steadily worse over the last few months.
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Old 09-13-2012, 11:40 AM
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well if it ran good then performance deteriorated, i'm unsure. surely the jet is the right one for your elevation, right? i mean, the choke richens the mix, so unless you have a vacuum leak, it'd be a jet issue, right? quick test, get it running, spray ether/starting fluid around intake boot and see if she revs up.
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Old 09-13-2012, 11:48 AM
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Couldn't the jet just getting more and more clogged?
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Old 09-13-2012, 11:53 AM
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if the jet was getting more and more clogged, you couldn't rev it up, it would start bogging down with more throttle.
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Old 09-13-2012, 11:53 AM
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90cc, atv, carburetor, chinese, choke, cholr, half, jets, quad, run, running, seafoam, spray, start, wont



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