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Old 10-09-2012, 05:24 AM   #1
zeeede OP
Studly Adventurer
 
Joined: Mar 2012
Oddometer: 682
'09 klx250sf randomly stalling

So BostonRider has had a couple of problems with her KLX250SF lately. On our tour through Quebec a couple of weeks ago, in cooler (60 degree F) wet weather, the bike would stall while riding down the road at a decent clip (45 mph or so) and then wouldn't start for a few minutes after. We experienced this 2 or three times. Over the trip.

This past weekend, on a little 3 day trip to Maine, in cooler still dry weather (50 degree F), the bike stalled at idle/low speeds in traffic. Started normally afterwards.

An on-going problem she's been having is the bike doesn't like to start (starter turns over, bike doesn't fire) unless it's in neutral and often requires the choke, even if it's warm.

Could these be related? What should we check?

Thanks!
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Old 10-09-2012, 05:45 AM   #2
8gv
Beastly Adventurer
 
Joined: Nov 2009
Location: North central CT
Oddometer: 2,117
Fuel system:

Maybe the carb float bowl runs out of fuel.
Is there a tank vent tube that's pinched?
After it quits, open the gas cap and listen for air rushing in.
Maybe the engine pulls fuel against an ever increasing vaccum in the tank until it can pull no more.
Is the float sticking?
Is the fuel tap bunked up inside?
Is the fuel filter clean?
How full is the tank when this happens?
Could water be getting into the fuel tap?
My buddy has one of these and if he doesn't run it regularly it won't start unless he drains the float bowl.
These seem to be troubled by ethanol.
For better starts and performance, consider adjusting the mixture screw on the output side of the carb.
You may get some things cleaned up by running a can of Sea Foam through the bike.

Ignition system:

Could the kickstand/clutch safety switches be intermittently failing?
Is the spark plug wire cap well attached?

Intermittent troubles are a pain and generate mistrust of the bike.

Good luck!
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Old 10-09-2012, 08:37 AM   #3
zeeede OP
Studly Adventurer
 
Joined: Mar 2012
Oddometer: 682
Quote:
Originally Posted by 8gv View Post
Fuel system:

Maybe the carb float bowl runs out of fuel.
Is there a tank vent tube that's pinched?
After it quits, open the gas cap and listen for air rushing in.
Maybe the engine pulls fuel against an ever increasing vaccum in the tank until it can pull no more.
Is the float sticking?
Is the fuel tap bunked up inside?
Is the fuel filter clean?
How full is the tank when this happens?
Could water be getting into the fuel tap?
My buddy has one of these and if he doesn't run it regularly it won't start unless he drains the float bowl.
These seem to be troubled by ethanol.
For better starts and performance, consider adjusting the mixture screw on the output side of the carb.
You may get some things cleaned up by running a can of Sea Foam through the bike.

Ignition system:

Could the kickstand/clutch safety switches be intermittently failing?
Is the spark plug wire cap well attached?

Intermittent troubles are a pain and generate mistrust of the bike.

Good luck!
Yeah, I was kind of hoping it'd be a "oh yeah, I had that same problem" thing. We put a bit of sea foam through it a couple of tanks ago. We'll try a couple more tanks. I've never had a set of carborators apart or even off a bike... I'm worried if we try we won't be able to get it back together.

I'll fiddle with the mixture screw a bit...that could be a simple adjustment.

The tank is well vented. It's an aftermarket tank with a vent tube out the top of the gas cap, and we used that vent tube as a siphon hose on Friday when *someone* forgot to turn her bike off the reserve at the last fill up and ran out of gas, so I know the tube isn't blocked.

When we had the dying problem in the wet spark was my first guess, so we actually pulled the spark plug and checked it, it was a little dark but not too bad...gap was a little wide so we re-gapped it... re-attached the plug and haven't had that problem since, so maybe it was just a loose plug wire? I just figured I'd throw up all the problems in case they were related.
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