Leaky radiator fluid.

4 replies to this topic
  • iceee187

Posted December 06, 2011 - 05:41 PM


2006 yz 450 high comp piston, full exhaust, non oem top end gaskets.
Ofter a rebuild I have fluid coming out of the front cyclinder head flange. leaking a drop a second. very notciable. Everything is in spec of tightness. could my head gasket be blown some how. Its a tuck offraod gasket. ask and I can give u more details.

  • grayracer513

Posted December 06, 2011 - 07:40 PM


Check for a coolant leak at the joint between the head and the tube where radiator hose connects to the top end.

How did you do your cylinder head torque?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • iceee187

Posted December 07, 2011 - 02:42 AM


there is no leakage from the head gasket anwhere, it seems to still be coming from the front flange. Just put a OEM oring in the front top head cylinder head rad intake flange.
I did a 22 ft lb then a 180 degree turn on the bolts???

  • iceee187

Posted December 07, 2011 - 02:43 AM


its a 14.1 comp piston???

  • grayracer513

Posted December 07, 2011 - 08:06 AM


I did a 22 ft lb then a 180 degree turn on the bolts???

That would be overtightened. You're supposed to pretorque to 22 ft/lb, then loosen the bolt and retorque to 14 ft/lb, THEN turn each bolt another 180 in 90 degree steps.



As far as the leak, if it persists from the outlet tube, inspect the socket the tube sits in as well as the tube and the O-ring for damage.

Related Content


The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.