1 cylinder cutting out

[cliffh]

I'm having a problem with my NT700. It starts and runs great, no problem for hours at 70 mph, BUT if I get into a town and start hitting traffic lights, the problem occures.
The bike will idle just fine, but on acceleration, often when I get to about 1/3 throttle, one cylinder cuts out. It will come back Immediatly if I reduce throttle. If I'm gentle for maybe 700 or 1,000 feet, the problem goes away. The engine temperature has to get to the point where the fans kick in. Any other time, the bike runs perfect.

Any ideas? Anyone else had this problem and solved it? Since the problem only occures under load, I know of no way to even tell which cylinder is cutting out.

Cliff
2010 NT700 45,200 miles

 

[ARKNT]

Do some searches on the crank position sensor. Several of these have failed for riders and it is generally heat related.
Not a huge deal to change out, assuming the part is available.
Good luck.

Arknt

 

[cliffh]

I thought about that, but crank position failure is a little different. Failure to start until cooled and things like that. It also sets a computer code.
My engine isn't quiting and always starts very easy, and no computer code. I had a crank position sensor fail a couple years ago and replaced it. Fairly easy job except for removing the muffler.

This problem is apparently heat related, probably electrical, and I have no idea what it is.

Thanks for your answer though.

 

[cliffh]

Right now I'm thinking ignition coil, but I hate the thought of removing all that plastic without a better idea of the problem. And then I don't even know where the coils are yet.

I'm hoping someone here has had the identical problem.

 

[mikesim]

I thought about that, but crank position failure is a little different. Failure to start until cooled and things like that. It also sets a computer code.
My engine isn't quiting and always starts very easy, and no computer code. I had a crank position sensor fail a couple years ago and replaced it. Fairly easy job except for removing the muffler.

This problem is apparently heat related, probably electrical, and I have no idea what it is.

Thanks for your answer though.

I wouldn't dismiss the crank sensor just yet It can fail as you describe. I have seen them act up both ways. The commonality however is the excessive heat when it occurs. If'n I was a betting man, my money would be on the crank sensor.

Mike

 

[Coyote Chris]

I wouldn't dismiss the crank sensor just yet It can fail as you describe. I have seen them act up both ways. The commonality however is the excessive heat when it occurs. If'n I was a betting man, my money would be on the crank sensor.

Mike

Sounds more coil/ sparking plug/ wire ish. There was an issue with the caps.
The engine control module on a Subaru or nt has historical memory. Think of that as a little guy in a box who counts pulses from the cam position sensor and the crank position sensor. Once he counts a few from each, he can say, "Shoot, I now know the relationship between each. I just need to count one or the other. If one breaks, like my crank position on my nt, or my cam position sensor on my old Subaru, you never know it unless you turn the engine off and try to restart it or a trouble code appears.
Easy to troubleshoot if you can get to the coils and have a can of freeze mist. You may have to shotgun.