identifying yz400/426/450 Motor?

7 replies to this topic
  • TampaBoy813

Posted June 30, 2004 - 05:07 PM


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:

  • don87xr600

Posted June 30, 2004 - 06:00 PM


engine Number? call a yamaha shop and they can let you know what size matches up with the number

  • Hamish

Posted June 30, 2004 - 09:10 PM


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

  • bushy

Posted July 01, 2004 - 03:39 AM


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

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  • TampaBoy813

Posted July 01, 2004 - 06:20 AM


Ok i think this is the deal...its a 426 motor with a 400f intake and carb...the hotstart off the 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:

  • YZFan

Posted July 01, 2004 - 08:29 AM


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

  • TampaBoy813

Posted July 01, 2004 - 05:16 PM


Dose the 426 fug fit on the 400 case? :thumbsup:

  • bushy

Posted July 02, 2004 - 04:17 AM


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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