xr100 ticking problem

i have a 2002 xr100 that starts to tick really bad when climbing steep hills and somtimes when riding long wheelies. it does stop when the bike is level. im almost positive its because the engine isnt getting much fuel as it should be but i still havnt had this problem with any other bike ive owned. i change my oil very frequently so is this just an early sign that the motors dieing or is it somthing else? thanks mike

Sounds like oil starvation to me. The motor's under load and the top-end is asking for lube and not getting it. Oil pump failing?

that sounds like a better explaination for it but why would it only be when the bike is straight up?

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