engine pinging jackhammer noise

TruewoC

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Aug 10, 2018
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my 50cc motorized bike has started making a ticking noise. best i can describe it is it sounds exactly like a jack hammer. it only ticks at idle and low speeds. when i give it wide open throttle the noise goes away.
 
It's hard to say. I would probably pull the head look for battering which their probably won't be cause it stops under load, and check the wrist pin.
 
It's hard to say. I would probably pull the head look for battering which their probably won't be cause it stops under load, and check the wrist pin.
thanks for the suggestion. will do when I return from my vacation. there is a video on youtube with the exact same noise my bike is making:
 
It goes away under load and at higher rpms unlike in the vid. How do I diagnose a bad wrist pin bearing? By checking for play?
yes and visual inspection. Show us some pics. of the head and piston before you clean them.
 
don't always blame motor for a noise like that, it could easily be something rattling on bike or inside muffler
 
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