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Honda Ct70 Minibike, Piston Not Moving?

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Sep 24, 2005
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#1
I have a honda ct70 thats been sitting for 15+ years that I am trying to get running again.

I removed the spark plug and noticed when trying to kick start it, the piston is not moving.

Any ideas what wrong, and if its fixable?

Thanks
 

Rich Rohrich

Moderator / BioHazard
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#3
Over time an aluminum piston sitting in a steel liner equipped cylinder will form a corrosion layer that can pretty much lock the piston in the bore. If the corrosion on the piston isn't too far gone you can sometimes fix these problems by pouring a 4-6 ounces of WD40 in the spark plug hole and letting it sit for a few days. WD40 will usually break down the corrosion and free up the piston. Make sure you change the engine oil afterwards to flush out the WD40.