Engine shuts off / hard to restart


8 replies to this topic
  • Kirkster

Posted September 26, 2011 - 12:02 PM

#1

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!!!!

  • Krannie McKranface

Posted September 26, 2011 - 01:11 PM

#2

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.

  • Kirkster

Posted September 26, 2011 - 01:19 PM

#3

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???

  • Krannie McKranface

Posted September 26, 2011 - 01:21 PM

#4

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.

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  • miweber929

Posted September 26, 2011 - 01:24 PM

#5

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

Mike

  • Kirkster

Posted September 26, 2011 - 01:54 PM

#6

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...

  • Kirkster

Posted September 26, 2011 - 01:57 PM

#7

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.

  • Krannie McKranface

Posted September 26, 2011 - 06:06 PM

#8

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.

  • MANIAC998

Posted September 26, 2011 - 07:09 PM

#9

Check them valves! Like Mike mentioned, it sounds like a tight intake. Maniac




 
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