400ex Cam bearings

[guinness77]

I noticed on the RIVA motorsports web site that the 2 cam bearings on the 400ex cam are of different sizes. They say that the bearing on the side of the cam with the chain is a 18x37x9 (18mm bore diameter x 37mm outer diameter x 9mm thickness). They say that the bearing on the side of the cam without the chain is a 20x37x9.

This doesn't exactly sound true. Also.... I've tried several bearing sites and can't find any 18mmbore bearings.

Does anyone have those specific measurements? I once had to tear into a 400ex head and they sure looked the same to me.

[drew416ex]

I dont have the sizes of hand but that is right. The ID is different on the two.

[droppedmazda]

the 2 bearings are different, they look the same but they do not fit if reverse how they go on.

[250xfreak]

and one bearing is sealed and one is not