2001 Yamaha Grizzly 600 - Engine Knock

[thetucks]

I have a grizzly that has a lower engine knock. Any pointers you guys can give me on tearing it apart to fix the problem? im guessing a connecting rod is knocking. Im going to take the head and cylinder off tomorrow to inspect the piston to conecting rod and see if thats my problem. im betting its the lower bearing or something. the manual says you have to remove the engine to replace the lower...is that right? any tips?? thanks for any and all help.

[oxidized_black]

i'm not sure about taking the engine out, but if the manual says; it might be a helluva lot easier to work on. ck1999_400ex would be a good guy to pm about this. i know he's done alot of yamaha work ...

[thetucks]

Thanks oxidized_black for the reply. I have removed all the head and cylinder with it in but now im at the point that it will have to be removed to split it in half. can anyone verify this? thanks

[CK1999_400ex]

yes u will have to remove the motor from the frame to split the case to get the crank and rod out ... but another thing that will sound like a lower end motor knock is a worn clutch .. i have seen that on many quads with a belt drive .. they sound like the lower end is knocking when its actually not .. it was a clutch with worn parts ..causing the noise ... that has not always been it ... some times it is actually the rod or bad crank ...