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I have an extra TW200 motor but do not know the year model. How do you use the serial number on the engine to determine the year?
 

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The short answer is that you can't. There aren't enough identifiers.



You can narrow it down by the type of camchain adjuster, stator and carburetor.



There are 3 basic "series" of motors. All are mechanically identical except for carbs, camchain tensioner and stator type.



87-only has a manual camchain tensioner, slide carburetor and seperate lighting coil in the left sidecover. '88-'00 have a manual camchain tensioner, slide carb and single-phase charging system. '01-up have an automatic tensioner, CV carb and three-phase chatging system.



'01-up also typically have 8mm hex head bolts on the side covers and crankcase halves, but that isn't neccessarily set in stone. Early motors have JIS Phillips head screws.
 

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Discussion Starter #4
The short answer is that you can't. There aren't enough identifiers.



You can narrow it down by the type of camchain adjuster, stator and carburetor.



There are 3 basic "series" of motors. All are mechanically identical except for carbs, camchain tensioner and stator type.



87-only has a manual camchain tensioner, slide carburetor and seperate lighting coil in the left sidecover. '88-'00 have a manual camchain tensioner, slide carb and single-phase charging system. '01-up have an automatic tensioner, CV carb and three-phase chatging system.



'01-up also typically have 8mm hex head bolts on the side covers and crankcase halves, but that isn't neccessarily set in stone. Early motors have JIS Phillips head screws.
Thanks. I knew it wasn't a 1987 but was curious what year model it is. It has no carburetor on it but from you information, it has to be a 1988 to 2000.
 
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