motor identify

anybody know how to to identify the motor between a 400, 426, 450, is there a site i can go to with the number on the case.

if it is a 4 speed then it is a yzf 450

Take some pics of the motor...there was a difference in the valve cover and a couple different things from the 400 to the 426. The 450 is really really different when put side by side with the 400/426 motor...

The 450 has the oil fill cap on the left side of the case. The 400/426 are filled through the frame. Also, the 450 does not have a manual decompression release like the 400/426.

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