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Make sure to get us a video of the motor going up in smoke, or your slipper clutch burning up 😜 In other words, keep an eye on your motor temps, and make sure your slipper clutch is adjusted correctly, because those tires are going to affect those things. You will possibly need a smaller pinion.

The nut and spring on the spur is your slipper clutch adjustment. If it's too loose, the clutch will slip and get hot enough to melt your transmission. To set the gear mesh, put a piece of notebook paper between the gears and slide the motor to pinch the paper tight between the gears and...

This statement is backwards. If he wants less wheelies, he's going to want to go with a taller, or higher gear ratio by going with a larger pinion and/or smaller spur. So for example: A 20t pinion and 50t spur would be a 20:50 (20÷50) = .400 or 40% ratio. A 22t pinion with a 48t spur would be a...