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Hello i am a new owner of a 2008 kfx 450 and she is all stock. when riding it yesterday i opened it up and when i went to slow down and pulled the clutch in, it just killed on me. The guy that was riding with me said that when i got on it, I had black smoke coming out of the exhaust. I am thinking i am running rich, but could be wrong. Has anyone ever had this issue or came across someone who did? thanks in advance.
 

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Have you pulled the plug to see if it’s black/fouled?

Might just need the idle turned up a bit
 

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When i got my kfx it was doing the same thing. Mine was the map sensor, but it could be the coolant temp sensor, a failing ignition, a throttle position sensor, or a small hand full of other things. Lol but seriously though it would be a good idea if you are going to keep it a while if you would get familiar with removing the seat, front half of the plastic, and the gas tank, because maintenance will require it. My map sensor wasnt bad but the hose going to it came off...easy fix and its a possibility but you need to remove the gas tank to see it. Its right next to the throttle body, like 3 inches away and should be connected by a small hose. Should be the only hose there but its like impossible to see without taking the tank off.
 

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Went riding sat and when i started the bike it was way way rich....ran great the week before...checked everything with no luck...air filter was not over oiled..i even remapped the bike and it took going 12% leaner to get it just to even run...another thing is that the fast idle knob does nothing...when i pull it out it does not increase the idle at all......could my injector be bad??o..while at the track i put in a new pgm-fi unit..new fuel pump..and a new plug ...nothing helped at all...anyone else have this problem???
 

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Mine did the exact same thing and it was just the vacuum hose running from the throttle body to the map sensor had fallen off

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Yep cracked/split vacuum hose

Weak spark

Failing water temp sensor
 
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