head tube leakage?


1 reply to this topic
  • Shane_Bettin

Posted May 20, 2004 - 05:45 PM

#1

ok i have a 99 yz400f and i noticed that there was a little bit of oil around the frame right in front of the filler hole. i don't spill the oil to often and when i do it gets wiped right away. it almost looks like a little crack there or something. could it be cracked? its a small amount but i notice its a little wet in that area after a ride. any one else have this prob?

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted May 20, 2004 - 07:02 PM

#2

Haven't run into that myself, but I've seen it on other bikes that carry oil in the frame. Here's how I would find out for sure. You will need a regulated, or hand pumped supply of compressed air. Don't use more than 15psi for this.

Drain the oil. Disconnect the two oil lines at the bottom of the oil tank and replace them with a loop of hose so that the two fittings are hooked together, and the engine's disconnected. Remove the vent tube from the frame. With the oil cap in place, pump 5-10 psi of air into the frame through the vent, and brush soapy water over the suspect area. Bubbles are bad.

If it's really cracked, find a competent welder and get it fixed while it's small.





Related Content

Forums
Photo

Is it worth it? (Cam and High compression piston) by macgi77


Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies
Forums
Photo

YZ450F 03 Sparks driving me crazy by SirAttard


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

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
 
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.