Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.


Need HELP! 2012 WR450 weak spark

3 posts in this topic

I have a 2012 WR450, 1000k on it, mint condition. Was working perfectly, installed an aftermarket gas tank and hasn't run since. 


Extremely weak zap from the coil - won't fire the plug at all and will barely make a spark holding the coil wire near the frame. I get a mile shock when holding the lead, so there is a bit of power, not enough to fire the plug.


Does anyone know of any safety system that I may have bumped while changing the tank to cause this? I'm 1000 miles from the nearest bike shop and would cost $3000 to put my bike on a plane and fly it there.


I realize the issue occurring during the tank swap could be a coincidence, but it's the obvious place to start.





Share this post

Link to post
Share on other sites

Harness from stator is known to corrode

Plug caps go bad

Tip over sensor 

Throttle Body MAP and Temp sensors

Main ground

Battery ground

Battery with bad cell

Stator's go bad, though usually not this soon

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now