02 YZ426 Weak spark

No replies to this topic
  • farmallkid48

Posted June 13, 2014 - 04:48 PM


I have an 02 YZ426 that used to run real good, and seemed to start a little on the hard side now and than, after sitting for a while, couple months... it has a very very weak spark, checked most everything according to the manual and everything looks ok, coil tested good, but all my tests on the CDI were way under what the manual says; resistance anyways, the previous owner did have it rigged up with lights and turn signals and a small battery, but havent taken the side cover off to see if the stator is after market or not, tomorrow's project. So does anybody have any ideas what it could be causing the weak spark? it's weak enough where it wont start. I also tested the 2 yellow wires coming off the stator, which i assume probably isn't a stock stator correct? i was told those are the "power" wires and I'm only getting around 1 volt from each one turning it over by hand as fast as I can while reading the meter still haha. Somebody who knows these pretty good said I should be getting around 10 volts? just curious which direction I should head in, really not into throwing parts at it, give me a car and i'll make it run, but bikes... not so much


Thanks for any help!


Related Content


Megabomb Fitment by 288yz450

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 1 reply

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

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

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Wilson the Blue Privateer by jetfuel

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  50 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.