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TampaBoy813

identifying yz400/426/450 Motor?

8 posts in this topic

I have just bought a 426F quad..and an starting to think its a 400f motor....whats the best way to identify the motor? :thumbsup:

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the 10th digit in the engine number will tell you the year it was produced in.

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On the 426 the hotstart is right on the carb itself, on the 400 its external.

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Ok i think this is the deal...its a 426 motor with a 400f intake and carb...the hotstart off the carb....so i have been calling all over and I have a part # for a jug that was replaced and they told me the part # is for a 426...My next ? is do they have a hiflow waterpump and cover with the 426? :thumbsup:

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The 400's have a smaller clutch basket and cover. the 426 clutch cover is much bigger then the 400. I dont know if this will help but if you have a 426 to compare the clutch covers it should help?? I think the water pumps are the same between the 400 and the 426. Good luck

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If I were you I'd go back to the guy and raise hell until he can prove its a 426. To tell is a 426 it should say 426cm^3 on the side of the cylinder. If its a 400 it would say 399cm^3.

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