What crankshaft do I need

[WEEDHOPPER]

I bought my cg used and don't really know much about it other than it's supposed to be a 80cc with big bore kit.
The problem is that when I got it the magnet and crankshaft key way we're damaged ( the slot or the key is badly wollowed out )
I managed to get by for awhile using jb weld but I'm now ready for a new crankshaft but I'm not sure what one to buy.
My rod has af-80 stamped on it and piston is 50mm.
Not sure what my stroke would be or anything hoping for some info on my motor and crankshaft size

 

[Greg58]

I would search on ebay for that rod number, that will give you some info. Every piston I've seen for the larger bore upgrades have been the high pin type, as long as the crank you buy used the same bearings and piston it would work.

 

[Greg58]

Here’s that crankshaft/rod in one of mine, it’s a 40mm stroke.

 

[Greg58]

Here's one, make sure you measure before you order.

80cc bicycle GAS motor ENGINE- CRANK crankshaft ZAE-80 JS80 long connecting rod | eBay

Find many great new & used options and get the best deals for 80cc bicycle GAS motor ENGINE- CRANK crankshaft ZAE-80 JS80 long connecting rod at the best online prices at eBay! Free shipping for many products!

www.ebay.com

 

[WEEDHOPPER]

Yeah that's the same arm I got and it's a high hole piston like you said thank you for the help

 

[WEEDHOPPER]

Here's my piston

 

[WEEDHOPPER]

It's stamped 50-12 on the inside