I used the older carbs on my 3TB, pretty much the same jetting. The newer ones were jetted a little leaner. Watch the chain hitting the frame. The motor should be moved over(to the right) a bit plus/and the sprocket flipped and an 1/8" spacer between it and the seal to make sure the chain doesn't grind the bolts for the seal retainer off.
I used a key switch off a Yamaha Viper snowmobile and redid the loom. It starts the bike the same as car/truck, just turn the key past the "on" position, no start button needed so I didn't have to buy the righthand handlebar switch .
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