Alternative engine for a WR 400??

5 replies to this topic
  • Supernoddy

Posted November 11, 2010 - 02:23 PM


Can anyone tell me what engine might slot into a 1999 Wr 400 frame apart from a 400/426?? Any 2 stroke slot in?

Any info would be very appreciated :p

References or links would be great


  • Shred Jesse

Posted November 11, 2010 - 03:38 PM


Pretty sure a small block chevy drops right in.

  • jayh300

Posted November 11, 2010 - 03:51 PM


have read alittle about that... i think they changed the swing arm/ bolt set up in 02...

click the links in the end of this thread.. some of this is yz info also...


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  • jayh300

Posted November 11, 2010 - 04:00 PM


Pretty sure a small block chevy drops right in.

missed the part where he did not want a 400...426... so yeah sbc...

really, if i was gonna do a swap it would be a big bore 2 smoke.. maybe and air cooled wr 500 motor....
better be a good welder (which i am not)

  • Shred Jesse

Posted November 13, 2010 - 10:41 PM


Oh god... those 500cc two smokers are like straddling kegs of dynamite and lighting up 8 cigarattes. Lord knows when that sh-t will go off, and when it does you're in for one hell of a ride!

  • turbohaulic

Posted November 14, 2010 - 12:37 AM


I love my wr500. The motor runs awesome. :p


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