How hot it too hot?



2 replies to this topic
  • Sanch

Posted October 13, 2001 - 07:03 PM

#1

I recently got back into the dirt bike scene after 20yrs away. I got a good deal on a '99 YZ400F and picked up a TT-R90 for my son to learn on. My question is that since we do a lot of low speed riding, twice the 400 has gotten so hot it's pushed out water through the overflow. This concerns me, but without a gauge, how do I know when I need to run it to cool it off? I really don't want to warp something or blow a gasket...thanks.

------------------

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

Posted October 13, 2001 - 07:56 PM

#2

It's possible that your machine is not running too hot. If you fill the radiator to the top of the neck, it will spit out some coolant. Leave about an inch below the neck flange and see if it still discharges coolant. There needs to be a little space for thermal expansion.

  • az426

Posted October 15, 2001 - 07:26 AM

#3

remember this bike is a very high compression
race bike,it doesnt want to run at slow speeds and was designed to run at higher speeds.the wr's have the cam either retarded or advanced to for better bottom end.





Related Content

Forums
Photo
Supercross

Wilson the Blue Privateer by jetfuel


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 replies
Forums
Photo

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride


Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies
Forums
Photo

2016 YZ450 by CaptainKnobby


Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
Wiki
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info


Articles
  • 0 replies
Forums
Photo

BIGBORE FOR YZ450F 2006? by Taattie94


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 replies
 
x

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.