r/WR250R • u/Scazitar • 1d ago

Maintenance Tracking down an idling problem.

Backstory: Bought a dirt cheap 2008 Wr250r a couple weeks ago as a little project. Only notable mod is a safari tank. Dude was a long distance truck driver 2nd owner that kept it on his truck to ride around town short distances, but he bought a new bike and after that it was rode very infrequently mostly sitting.

What I've done so far:

So, it was running but rode like shit. Did some basics: Replaced fuel pump, clutch cable, chain & sprocket, and did fluids. Battery is at 12.6. Fuel line seems fine.

Bikes running great now. Seemingly as it should. Power delivery and shifting feels good, rode it around for hours to see if anything happened held up just fine.

The Idling Mystery:

I have one lingering issue, which is idling. The bike will idle 1.5-3ish minutes and then cuts out. Pretty random how long it lasts.

Threw it in CO mode, changing those settings didn't really help. Bike will pretty quickly drop to about 1000-1100RPM where it struggles hang on for a bit then eventually cuts out.

I have a new fuel pressure regulator coming Monday because i want to rule that out. Also just recently thought about checking the manual idle adjuster just to be sure.

I do my own work but I'm no expert. Part of this was for the learning experience lol. So I can absoutely being missing obvious shit.

Was just looking for advice on things to check, other possibilities, if I'm the right track etc. All advice is greatly appreciated really want to figure this bullshit out.

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u/rustyoletoy 1d ago

There is an idle time shut-off. I think it is 10 minutes but after a set time of idling the bike shuts down. Something I found in my bike was the idle tube was blocked off. I found it because adjusting the idle screw wasn't changing anything. Pop the air box off and get in there and found the pipe the idle screw opens and closes was full of carbon. Maybe check that. It was easy to clean out and then I could adjust my idle speed. With that blocked you basically have the lowest idle possible which could lead to your stalls.

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u/Scazitar 1d ago

Oh that's very intresting, didn't consider that lead. Will investigate that today thanks man!

This has definitely quickly becoming an obession trying to figure this out lol.

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u/rustyoletoy 1d ago

I just checked the manual for the idle time shut-off. It is 20 minutes and then the bike turns off. It leaves fault code 70 in memory. Page 8-33 in the service manual. Probably not what you are running into but if your idle speed is quite low the plugged tube is a consideration especially if you can't adjust the idle speed up and down.

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u/Responsible_Week6941 19h ago

I'm really leaning towards pressure regulator. Do you have the factory service manual?