You can put a honda atc125m engine in an atc70 frame. The popular way to go seems to be putting the lifan engines in the atc70 frames. You can get up to 125ccs' and now they have an even bigger 137cc engine. You can have them with electric start or convert a kick start engine to a pull start engine. Also you can have manual or automatic shift just like the stock atc70 engine. You can pick up a new lifan engine for around $300 or so a little more depending on shipping and you have a brand new engine. Most are 12 volts and come with the biggest parts to get them started. You will have to change some wiring connectors and your pretty much ready to go. If you want electric start, you will have to make a battery holder and buy and mount your battery and wire that up accordingly. To do this you will need a little better than just basic mechanical ability, but it is well within most peoples abilities. Have fun and welcome to the site.
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