Help. my sons derbi send r 125 wont start. all has been ok, but overnight it wont go. we charged the battery and put a new spark plug in. it turns over ok and there is a spark at the plug although not great. it tends to want to backfire when trying to bump start it. can any one help?
Have you checked your air filter. If its dirty wash out with air filter cleaner or petrol and replace.
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