good day then a bad day

[joedirt]

Raced a hare scramble saturday on my 2010 txc250 turned 310. Bike ran awesome. It has the stock txc250 ecu with power commander/autotune and 12 port injector. Came home cleaned the bike put a fresh air filter in. Sunday I go to an enduro and the bike stumbles real bad off of idle. I tried to ride it with keeping the rpm's up but thats a tough task in the tight trees. I must have stalled it 50 times. It made for a real crappy day. Weather was the same both days. I'm not sure what to do. How can a bike run awesome one day then be so bad the next?

 

[ghte]

have a look at the mapping something has changed.

 

[Boogie]

2010 txc250 turned 310

Hey mate, what was involved in turning your bike into a 310?

I've seen 310 kits for 2009 or older 250 but not for the X lite bikes.

 

[James Patton]

You washed it. Start looking for connector loose or corroded around spark plug, throttle body etc...

 

[joedirt]

Hey mate, what was involved in turning your bike into a 310?

I've seen 310 kits for 2009 or older 250 but not for the X lite bikes.

I bought all oem Husky parts. Cylinder, piston, crank, timing chain, headbolts, timing chain guides, and gaskets. Had to machine the cases for the cylinder.

 

[joedirt]

You washed it. Start looking for connector loose or corroded around spark plug, throttle body etc...

Ill check.

 

[dukepilot]

Too much oil on your air filter?

 

[joedirt]

It ran fine on top end the problem is just as you start to roll on the throttle.

 

[Weantright]

Water shorting the spark plug wire where it connects to the cap. While there look at the other end where the wire goes into the coil.

 

[Colo moto]

Water shorting the spark plug wire where it connects to the cap. While there look at the other end where the wire goes into the coil.

+1 on this.

Also, if this doesn't fix it, it may be a clogged injector. Had my 2010 TXC 250 start doing almost the same thing. Would run pretty good up at high rpm, but wouldn't run for crap down low. Took the injector out and touched the 2 wire connectors with the 2 posts on a 9v battery. This opens the injector. Take an air hose and blow through all the injector holes. Problem solved.

 

[joedirt]

Problem was a broken wire in the O2 sensor jumper plug.

 

[OlderHuskyRider]

Problem was a broken wire in the O2 sensor jumper plug.

Thanks for posting the resolution.

What color wire? So it was a wire leading to the jumper plug right? Was it wear related, did vibration break it?

 

[joedirt]

Its the only wire on the plug. I actually think its a diode or something thats shrinked wrap. It was on the bike when I bought it and by chance I had another to put on which was double shrinked wrapped.

 

[joedirt]

 

[OlderHuskyRider]

Thanks for the pic, we'll add this to the "list of things to check".!