derbi gpr 50

I have a 2003 derbi gpr 50 which i bought 2 months ago and have put about 200 miles on it and now it boggs out when i try to open the throttle up, but if I hold it steady i don't have a problem. WHAT do I need to do to fix it. The only modifications to it are a metrakit cylinder head and a k&n air filter

Re: derbi gpr 50

Steamboat Aka J. R. Stevens /

Re: derbi gpr 50

Louie Armstrong /

Did you break it in properly? Doesn't sound like it.

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