300ex knocking noise

[RideRedEX]

strange knocking noise coming from my 300. things that i have checked are the valves, rockers, piston and rings, wrist pin bearings and rod bearings, they all seem to be fine. the weird part is it only makes the knocking noise at a certain rpm. the inside cam bearing has a small amount of play but i didnt think it would be enough to make the loud knocking.

[newbieboozer]

is the knocking noise right after idle RPM......i have a 300ex with around 1000 km's on it and it will make a knocking noice right after i'de rpm, so if you rev above this idle and it seems to go away then it is probably a regular noise...been in mine since day 1

[RideRedEX]

ive had this quad fo a year and its never made this noise before and its way to loud of a knock to be normal.