where to find a new piston for 40mm stroke crank?

I'm not entirely sure it's a 40mm stroke, it may just have a longer rod (40mm stroke makes it a 70cc motor). Look for Skyhawk pistons, they use the higher wrist pin, I bought a new one from a new vendor and got the low wrist pin so I couldn't use it. Since you're in Michigan, I dont think you'll be able to order from www.motorizedbicycle.ca, but... ya never know, thats where I got my first 3 kits, and all have the higher wrist pin. I dont know what all the hate is about on grubee skyhawks is, I've had 3 and none have broken down on their own (one was stolen, one lost to a fire, and my current one breaks down because I tend to forget simple things), to my knowledge all kits are the same random "quality", aside from pretuned ones.
 
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