Chainsaw motorized bike

This is my chainsaw motorized bike. I use 1,8 kw chainsaw and gear wheels with 9, 48, 11, 48 teeth. Cycle wheel goes 23,27x slowlier than chainsaw. How to make 9T handmade gearwheel, you can see here:
https://www.youtube.com/watch?v=ZRH4js5bxaU
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Видео Chainsaw motorized bike канала Home experiments