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Discussion Starter · #1 ·
Ok so I order a 25mm carb and filter..what size jet will I need?? I'm kinda new to this..my stock 19mm carb is done for..junk..I've tried cleaning and all..also..my engine says 139fmb..50cc right???just wanna know a bit about bike..thanks
 

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That's alot of carb for a 50cc, I have a 25mm on my 125cc ATV.
 

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Probably for a full race engine. With a big carb you might need to put alot bigger main jet, and it will use more gas.
 

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Try it with the jets that come with it first, and see how it runs. I have 3 different PZ19mm carbs that have different pilot jets. Usually the main jets will interchange.
 
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