07 Wr450 Coolant Overflow

6 replies to this topic
  • kodiak7

Posted March 03, 2008 - 03:57 PM


I Took Off My Overflow Tank And Just Ran A Hose From The Radiator Cap Down The Frame, Will This Work Ok? I Dont See Why Not, Thats Exactly How The Yz Is Done, Does Anybody Have Any Ideas? It Should Be Fine Right?

  • BajaFool

Posted March 03, 2008 - 04:26 PM


Should work just fine--- if you want to boil all of the antifreeze out of your radiator in tight trail riding situations and then seize your motor.

  • William1

Posted March 03, 2008 - 05:37 PM


I would keep the overflow on unless all you ride is fire roads and MX.

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  • redswr

Posted March 03, 2008 - 06:17 PM


i did this on my 99 and it always leaks the fluid out... i ride all dunes on it too so its never going slow.

  • groundpounder450

Posted March 03, 2008 - 06:25 PM


i had a 03 yz450 and when i was in the tight trails it boiled over like clock work... nothing like gettin a face full of hot steamy anti-freeze on a steep rocky hill to make u fall down and yack... trust me it WILL ruin ur day

  • TRUE_2_YAMAHA_001

Posted March 03, 2008 - 10:36 PM


The other thing about doing that is: it is an EPA violation or some BS like that and you could get fined and your green sticker taken and changed to a red sticker.

  • kodiak7

Posted March 04, 2008 - 08:36 AM


obviously its not a problem, the yz 450s have the same psi radiator cap, same radiator, everything, and they work fine without a tank, it has nothing to do with how fast it will 'boil over' ! :thumbsup:


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