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17 tooth front, 42 tooth rear, 110 link chain, size 530
well if you have a 8 tooth rear driver you will need a 23t sprocket, if u have a 9 tooth rear driver you will need a 25t sprocket, if u have a 10 tooth rear driver you will need a 28t sprocket, and if you have a 11 tooth rear driver you will need a 30t sprocket
13 tooth front/ 40 tooth rear
In the drive train you have the front chainwheel/ring and the rear sprocket that both engage the chain. The pointy bits on sprocket and chainwheel which allows the chain to grip are called teeth. The ratio between the tooth counts is what determines which gear ratio the bike has.
External diameter, internal diameter, and tooth count.
120 chain link
There isn't much need to discuss tooth size as such. The important things are which width of chain the sprocket is intended for and the tooth count. Tooth count decides which gear ratio you get.
The front sprocket on the engine that the drive chain goes round has approx 16 teeth. To drop it down you remove the sprocket and replace it with a 15 tooth. same idea on the back but up 2 teeth which makes the sprocket larger. Reducing the size of the front and increasing the rear will improve acceleration but will have slower top end, usually makes for better low speed handling too.
straighten the bent washer, Did you buy spare lock washers? remove the nut, 1-1/4" or 32 mm, I stand on the rear brake loosen the chain adjustment work the front sprocket out if the chain, it's tougher with a 14 tooth install new sprocket Don't forget to bend the washer back over the nut if you have the stock chain it might not have a master link so i cut mine but there is a way to take it off without cutting .
a 25 tooth sprocket will fit on a 9 tooth driver
No way of telling, it depends on how strong or high revving the engine is. Switching to a bigger front sprocket might make the bike faster, but only if the engine is strong enough.
going by all the other yamahas raptor banshee blaster i would say its a 40 tooth Yamaha always goes with a 13 tooth front sprocket and a 40 rear