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Enduro Engine 4 stroke (including EFI & Exhaust) 4 stroke engine, EFI, and exhaust discussion


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  #1  
Old 06-19-2016, 09:06 AM
schlitzy schlitzy is offline
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Default 2009 450 fsr bogs when hot

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?


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Old 06-19-2016, 04:06 PM
Yngvim Yngvim is offline
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Quote:
Originally Posted by schlitzy View Post
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
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Old 06-19-2016, 04:19 PM
schlitzy schlitzy is offline
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Originally Posted by Yngvim View Post
Is the temp sensor working properly?

EC 250 2001, Fse 450 2004
I have no idea, do you have specs for it?
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Old 06-19-2016, 04:26 PM
Yngvim Yngvim is offline
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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
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Old 06-19-2016, 05:21 PM
schlitzy schlitzy is offline
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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.
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Old 06-20-2016, 01:10 AM
Tafka Tafka is offline
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Should be this water sensor, so you could measure the resistance:
http://www.boltekdesigns.com/Downloa...e%20sensor.pdf
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Old 06-26-2016, 12:02 PM
schlitzy schlitzy is offline
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That is a Magneti Marelli, which is the old system. I would guess that was changed when they switched to Kokusan.
Thx
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Old 06-26-2016, 02:04 PM
Tafka Tafka is offline
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Water sensor is the same
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