I little while back I was riding my 2010 EFI TXC250 and was in the middle of a group ride. A dude was struggling on a hill and we were waiting, quite a while. Anyway when he got to the top we all got ready to go and my bike would not start. Was running perfectly. I finally got it to fire and it ran OK the rest of the day but not 100%. Every time it got cold it would not start. The issue was a $10 temp sensor that treads into the cylinder. The original one went bad at 1100 miles. Very EZ to install and cheap. Starts and runs perfect again. The EFI thought the bike was way hot when this happened and was not enriching to start cold and then did not run real good as it was compensating for what it thought was a real hot motor. Probably a fluke and not something you will run into but if your EFI suddenly does not want to start cold I would look there.
Good to know. I am glad you posted to wait and let the fuel pump build pressure before starting. I thought my bike was fouling a plug.
yeah, thats an odd one. Anymore i just pop the clutch and stall it to kill it then i don;t have to deal with the 2 second wait
Just to let everyone know, you may want to pick up one of these temp. sensors. Rode this past weekend and the next day I washed my bike and when I tried to start it the bike would crank but would not fire. After a few hours of cleaning every connection and talking to Kelly, I realized my temp sensor is bad too. When hooked up to Ibeat in the graph it shows the temperature at max. Just in case this happens to you where the bike will not start and in the woods. Try un-hooking the wire to it and see if it starts, mine did. I am not sure if it will run well that way but at least it will not leave you stranded. I am thinking once the bike is warm you could plug it back in but I have not tried that yet. It is a very cheap part and it would be good to have just in case.
did i beat show a temp sensor fault? Is this just the new smaller motor or effects the older style too? Just wondering.......no probs here Joe
Little brass thing with 2 wires on the right rear of the cylinder (on the 2010 TXC250). Sent an FYI to husky on this. Cheap part and EZ fix but might be an issue.
Should apply to all bikes with an EFI and a temp sensor- my 09TE450 certainly has one so this is great info- I will get a spare one. Nice to know you can unplug it in a pinch thanks for that raisrx251. Thanks Kelly for sharing. Question- does the temp sensor only default to HOT if it goes bad, could it default to COLD if bad?- Running like crap when HOT then- I've had that but might not be the sensor... but why I ask.
It would be good to know if anyone out there has had this part fail on a '09 or older Husky. The new motor 250's are the only ones I have ever seen fail. I know Kelly's and mine showed in Ibeat that the bike was Hot on the graph of Ibeat. I just went out and my bike started with it un-hooked. I am not sure if it would run well but it could get you back to the truck. I also plugged the sensor back in while it was running and the bike stayed running. The bike then re-fired with it plugged in. So between the two you could figure out which way the bike would run best. Just a trail tip.
Hmmmm. Makes me glad that the only temperature sensor on the TC is my left leg when it gets too close to the pipe! Sorry, couldn't resist the temptation to get a poke in at all you EFI guys!
We've seen temp sensors fail on 08 & 09s as well, not enough to be a concern but a few. Occassionally you'll get one which doesn't show a fault on the Ibeat but when you watch the graph the water temp climbs evenly until around 75/80 degrees then the sensor starts to give spurious readings and the temp graph jumps up and down. Dave
Dave- are there any symptoms one would notice from the bike specific to a bad temp sensor? Is hooking up to Ibeat and checking the readings how you are noticing the "spurious" readings? I don't have the stock speedo (rain damage) - Will be purchasing an Ibeat2... Can it default to COLD and run like crap when HOT??? Thanks
On mine it was really hard to get it to start cold as it thought it was smoking hot (and iBeat showed this as well). In iBeat there was an error message about it and the temp gauge was off the chart. I believe Tim (raisrx251) said he had this issue and he unplugged his and it ran OK. I did not try this.
If the sensor goes bad then there could be a number of symptoms from fan on all the time to poor starting (as Kelly mentioned) to incorrect fuelling when hot. If the ECU thinks the bike is hotter or colder than it actually is then the fuelling will be out. Watching the temp readings on Ibeat is the only real way to identify the issue. Dave
