HEADS UP!!!

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.

Sign in to follow this  
Followers 0
Kirkster

Engine shuts off / hard to restart

9 posts in this topic

I have an 07 wr450F that has been bullet proof for the last 3 years (got it in 08).

I had an issue when I was on the mountain in Hatfield last winter where the bike would just die. then would not refire for around a minute. It did this several times before the end of the trip.

I could not replicate the problem when I got it home and it was fine this spring at hatfield. It was also fine this summer when I actually got out to ride it a couple of times.

Today it started happening again. It was very difficult to start (the bike would always start with 4 pumps of the throttle before no matter what) Then ran it a bit to warm it up. It then died and would not restart for 3 or 4 minutes. When it finally got running again it did the same thing.

We drained the fuel and drained the fuel in the float bowl and refilled it with fresh fuel. Still did not want to start, and when it did it ran till we let it idle and then died and would not restart.

Never had a single problem with the bike before this happened. Ran like a top after uncorking and rejetting it to no longer be lean as it came from the factory.

HELP!!!!

Share this post


Link to post
Share on other sites

It's either fuel or electrical.

Is your fuel fresh?

Did you put Stabil in the gas before you stored it? If not, you have a clogged pilot jet.

If the fuel is ok, then you have a loose harness or battery connection, or a failing Stator.

Share this post


Link to post
Share on other sites

The fuel is fresh, but it sat for a month or two with no stabile. But would a clogged pilot jet keep you from starting the bike?

How do you test for a failing stator???

Share this post


Link to post
Share on other sites
The fuel is fresh, but it sat for a month or two with no stabil.

How do you test for a failing stator???

If the issue is 'heat and time' related (after 13 min of a hot motor, the electrical fails, for example) that is a typical stator failure issue.

Don't jump to conclusions. Go over all your electrical connections, coil wire, plug lead, etc first.

You need a service manual to show you how to test the Stator.

Share this post


Link to post
Share on other sites
If the issue is 'heat and time' related (after 13 min of a hot motor, the electrical fails, for example) that is a typical stator failure issue.

Don't jump to conclusions. Go over all your electrical connections, coil wire, plug lead, etc first.

You need a service manual to show you how to test the Stator.

I will noodle through the electrical now. I have a service manual...

Any chance you've checked the valves recently? Might be tight intake.....just a thought.

Mike

Been 40 or 50 hours since I have checked clearances. Guess I should do that while I am at it...

Share this post


Link to post
Share on other sites

I did pull the petcock and there was a little gunk on the reserve screen. the main screen was clean, so I am guessing it is not a fuel flow issue. the new 2 1/2 gallons came out with no flow issues.

Share this post


Link to post
Share on other sites
I did pull the petcock and there was a little gunk on the reserve screen. the main screen was clean, so I am guessing it is not a fuel flow issue. the new 2 1/2 gallons came out with no flow issues.

You won't see issues where there is a strong concentration of gas fumes (gas tank). You will see it in the carb.

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
Sign in to follow this  
Followers 0