There is now made a new type of motor mount for Yamaha TZ from 1991 to 1999, the new mount is 15 mm. longer to the right side, and about 40 mm longer forward, and it is possible to have the lover exhaust coming out under the middle of the motor, that give the driver more spaces to the right arm and more spaces to the seat, it is also give you a better weight balance. 

To avoid over load of the chain, can I recommend to have 20 or 21 cogs sprocket on the motor, and adjust the rest on the rear axle, and you can use water tube (part number 1615) from the side radiator to the water pump.