Ok all you Yamaholics:

Can a 426 head/cylinder fit the Warrior 350 engine? If so, what is needed?

 

I do not think this could be done due to the fact that the 426 head would be atleast a 4 valve were the warrior is only a 2 valve and also the difference in liquid cooled and air cooled. But I could be wrong.

 

I think Maddogg was also saying the cylinder too.
Will the cylinder and head of a 426 or a 400f bolt on to a warrior bottom end. If so what is needed to complete this tranformation.

 

I seriously doubt it. The engines are totally different. It would probally be easier to install a 426 in the Warrior and put an electric start on it(someone could custom fab that). Personally I would wait for the new Yamaha Quad, it will probably be easier than either conversion.

 

Hey, this is definatly worth looking into. The one thing that comes to mind is where does the timming chain come through the motor?? What is the boar, and stroke of the 426? You also need to know the centerline of the crank to the face where the cylinder bolts on distance, cylinder lenth, rod lenth, piston pin diamiter, and centerline of piston pin to face of piston. Do you happen to have one of these motors?
If not how about a YAMAHA TT/XT/SR 500 (1975-82) 2v, or YAMAHA XT550/TT600 (1982-89) 2v. I got that from the web cam page, here is the link http://www.webcaminc.com/yamahamoto.html#y3
I never thought of looking into a different cylinder or head.