I have recently just bought a new pocket bike for very cheap, it came with no warranty. It is a 50cc 2 stroke pull start with no gears or clutch.

It worked perfectly when i first got it (a few days ago) but now it runs fine still but when i sit on it and attempt to accelerate it stalls/ dies, sometime it will be able to drive a few meters but it starts to backfire and the bogs down. It is able to be revved to high rpm when the rear wheel is lifted of the ground but not with any sort of load.

I have played with the idle screw on the carb but have had no luck. The carb is very small and has only 1 screw to adjust things. The idle is also quite rough.

Thanks in advanced for any answers.

Edit: here is a video of it stalling when i sit on it and accelerate https://youtu.be/s6u6LHSi00g


My gut says it's probably a fuel issue. It may be something as simple as a blocked jet within the carburettor.

Best course of action is probably to check the carburettor body for a manufacturers marking and see if you can search out an exploded diagram online somewhere. Then carefully strip the carburettor and clean the fuel jets with some carburettor cleaner.

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  • I don’t think i can take apart the carb, its in a really hard to reach place. I’m adding a video of the bike running. – Jacques Finlan Jan 29 '19 at 11:33

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