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Derby GP1 50cc running issues


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This is a question from a mate. All help advise greatly appreciated.


My son's got a Derbi GP1 50cc twist and go moped and it currently off the road with a problem.

The basic symptoms are:

Runs for a few minutes and then dies

Won't restart for a few minutes and then does the same

Low on power when pulling away

I've changed the battery and spark plug and made sure the fuel filter is clean but apart from that I'm at a loss of where to go next.

If anyone can give me an ideal of what to check that would be great.


I asked about immobiliser, air filter, carbs & jets. Anything else I might have missed?

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tell him to check the vacuum line that runs to the fuel tap

it could be split and not causing enough vacuum to open the tap properly

pretty common problem

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