Hey guys I have a 2008 KFX 450R and just got a new FCI intake installed on it and went out for the first trip of the year to the little sierra sand dunes unfortunetly I didnt get to ride very long, I started to notice it seemed like I was loosing power so I came to a stop and then went to go again and had to rev the machine pretty high to take off almost like I was in 4th gear trying to start out but I was in 1st gear then shortly after the noise begun, rattle and knock almost sounded like the entire motor was going to blow into pices so I shut her down took it home and tore it down took the head and cylinder off and the valves cylinder piston crank everthing looks good I thought for sure with all the racket I had to have sucked a valve or broke the connecting rod but no its all in great shape also keep in mind the machine only has around 30 hours on it. any ideas should I just put it back together??? and see what happens im baffeled thanks for any input or help!!!

 

Figured it out it is the bearing in the lower part of the connecting rod that hooks to the crank now I am just baffeled at why this happend had fresh oil and only 30 hrs on the machine should have lasted longer then that I would have thought.

 

Check all components of the intake air system like air filter, air box, throttle body, connecting rubber boot, etc. Look for any leak which might have let in dust/dirt which can chew up the rod bearing.

 

Who did the oil change last time?
How many hours did you ride after the last oil change?