2009 450 fsr bogs when hot

[schlitzy]

So the valves went out of spec at about 60 hours. Replaced the valves and set the clearance. The bike now starts very easily when cold. When it gets hot, after about 15-20 minutes, it starts to sputter. It will run if more throttle is added. If it dies it will rarely restart when hot, let it cool and it starts back up and runs great..until it heats up again. Everything on the inside looks great, no leaks and when it is cool the power is great and it sounds great. Any one have any ideas? Compression is good. Are there any sensors which go bad slowly? Would a fuel injector get partially clogged?

 

[Yngvim]

So the valves went out of spec at about 60 hours. Replaced the valves and set the clearance. The bike now starts very easily when cold. When it gets hot, after about 15-20 minutes, it starts to sputter. It will run if more throttle is added. If it dies it will rarely restart when hot, let it cool and it starts back up and runs great..until it heats up again. Everything on the inside looks great, no leaks and when it is cool the power is great and it sounds great. Any one have any ideas? Compression is good. Are there any sensors which go bad slowly? Would a fuel injector get partially clogged?

Is the temp sensor working properly?

EC 250 2001, Fse 450 2004

 

[schlitzy]

Is the temp sensor working properly?

EC 250 2001, Fse 450 2004

I have no idea, do you have specs for it?

 

[Yngvim]

Sorry I don't. Can you connect computer to your bike, in one of the threads are info about program and what cable to use there you can see exactly what the engin temp, air temp and more cool stuff that can help diagnose any faults

EC 250 2001, Fse 450 2004

 

[schlitzy]

I don't have the diagnostic software for the bike..it is the Kokusan FI system so it does not use the more common/older diagnostic system.

 

[Tafka]

Should be this water sensor, so you could measure the resistance:
http://www.boltekdesigns.com/Downloads/Bike%20stuff/wts05-water%20temperature%20sensor.pdf

 

[schlitzy]

That is a Magneti Marelli, which is the old system. I would guess that was changed when they switched to Kokusan.
Thx

 

[Tafka]

Water sensor is the same