tri z 250

no they are different, they have the same bore and stroke and cases but pistons are different elect. is different, compression they run nothing like a YZ
 
a YZ is a race bike with race porting,comp. piston reeds carb ignition timing a Tri-Z was a 3 wheeler meant for general ATV use, Yamaha puts performance parts in engines that are meant for closed course competition like a YZ I would guess a 10 HP differance between the 2, but a YZ engine will bolt right up, cranks are interchangable, pistons can swap but a YZ has a cut-away (race) a Tri-z has a windowed piston, like a blaster for general use.
 
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a YZ is a race bike with race porting,comp. piston reeds carb ignition timing a Tri-Z was a 3 wheeler meant for general ATV use, Yamaha puts performance parts in engines that are meant for closed course competition like a YZ I would guess a 10 HP differance between the 2, but a YZ engine will bolt right up, cranks are interchangable, pistons can swap but a YZ has a cut-away (race) a Tri-z has a windowed piston, like a blaster for general use.

alright man thanks rep given
 
you can bolt a 83-87 YZ engine into a tri-z chassis.. just have to use the tri-z head.. i had a yz engine in my tri-z for a while.. one thing no mentioned was the YZ is powervavled and the tri-z is not. i've got a powervavled triple exhaust ported yz engien for sale that came out of my tri-z. and i laso have a tri-z for sale.. if your lokign for a complete trike or just and eninge for a blaster swap