wet sump and blue wire mod questions

4 replies to this topic
  • tdd6405

Posted April 17, 2004 - 06:55 AM


i have a coupel questions

1. i bought a yz440 motor with the wet sump installed but i had no instruction from the other owner. where do you add oil? is it on top of the head where the oil overflow originally went back into the oil tank? also, how much oil do i put in with the kit. the people who installed it did not take out the nuetral switch and put the site glass in.

2. THE BLUE WIRE MOD- do i just cut the blue wire that comes to the plug from the nuetral switch? or is there more to it. and does ti really help?

thanks in advance for helpin me :)

  • YZFan

Posted April 17, 2004 - 09:50 AM


For the oil put the bike on its side (kick starter side down) then take out the big plastic plug in the side cover and add oil through there. Not sure how much to add though. Good luck

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • tdd6405

Posted April 17, 2004 - 10:20 AM


oh okay. does anyone else know how much to put in the motor? and change it what, every 2 or 3 hours?

how bout that blue wire mod

thanks alot yzfan!

  • Satch0922

Posted April 18, 2004 - 05:40 AM


Here is a pic of the Dr. D site glass that replaces the neutral switch. You then can remove the switch and wiring harness and chunk it!!
Posted Image

  • yzf400man

Posted April 18, 2004 - 08:02 AM


the blue wire helps a bunch. i did it to my 400 and it starts on the first or second kick no matter what. you should be able to pull the connector out of the plug, but i tried to do that on mine and the wire just came out. its stills works though and im glad i did it.

Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

Is the 2016 GYTR Yamaha YZ450F too fast? by Fryboy

Dirt Bike   Special Interest Forums   Pro Racing
  • * - - - -
  • Hot  241 replies

YZ450F 03 Sparks driving me crazy by SirAttard

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