motor

[flyingquadman]

:confused2 I HAD A CAM INSTALLED ON MY 2002 400EX,NEW RINGS ,PISTON.DID NOT BORE NO NEED.RAN GREAT FOR 30 MIN:THEN STARTED TO KNOCK IN THE LOWER UNIT. THE CRANK IS TIGHT THE CLUTCH LOOKS FINE THE BERRINGS LOOKS GOOD.HELP HELP
THANKS

[gojk]

Where does it sound like it is coming from? I just went through the same thing. Look at the thread Knocking Noise!!!

[lex luger]

it could be the cam chian....

[flyingquadman]

it sounds like down low into the motor.sounds like a deep tone noise the cam chain looks ok it was replaced with cam i thought it might be the crank but it is tight.clutch is fine so iam lost on this one

[ridered03]

it might be a loose cam chain slaping against the side od the motor.

[flyingquadman]

I THINK I HAVE FOUND THE PROBLEM,THIER IS A GEAR BEHIND THE OIL GEAR THAT HAS A TOOTH BROKE OFF DONT NO WHAT CAUSED IT BUT MAYBE THAT IS IN.DOES ANYONE KNOW ABOUT THE CLUTCH ON THE 4OOEX DOES IT HAVE SOMEPLAY I THE MOVEMENT,OR DOES IT POSE TO BE SOLID LIKE THE 250R.

[gojk]

Sounds like the exact same thing that happened to mine a few days ago. Third gear on the countershaft had 2 teeth broke off and the main tranny shaft was bent pretty bad. What caused it was a piece off the bottom of my sleeve broke off and got in there. It wasn't pretty. Anyways, $158 later I have the parts on the way. Still if anyone knows why this cylinder would have broke please let me know.