Name that clutch plate...

This clutch plate is out of a '99 YZ400 that I bought used. Wondering if anyone knows what they are. The owners manual is showing a symmetrical plate with no cut-out, so I am guessing they aren't stock. What is the orientation of the plates supposed to be? The cut-outs were all facing the same direction...

Here is the picture of the plate.

P1020973.jpg

Anyone?

It isn't stock. Stock ones are symmetrical as you said. Very strange!

sorry I couldn´t help!!

Found this

"...The metal plates are made from stamped steel and sometimes display a very slight asymmetry, i.e., the outside of each plate may have a slight flange resulting in a rounded side and a sharp side. Put the metal plates back in the same way that the old ones came out with one proviso – if the metal plates are asymmetric they should all face the same way. Which way doesn’t particularly matter as long as they are all the same...."

In this link http://www.motorcyclejazz.com/clutch.htm

I'll keep researching, if I find anything I'll post it...

had a 99 and had to do a clutch on it... they did not look like that from what i remember... it has been a while...

I have occasionally seen plates like that, but I would advise you to replace them with a new set. Those may well be from some earlier model, and are not the ones that belong in your bike.

I have occasionally seen plates like that, but I would advise you to replace them with a new set. Those may well be from some earlier model, and are not the ones that belong in your bike.

I checked the Yamaha website and they are not from an earlier 4-stroke (98). I would like to continue using them, as they were working good, I just would like to know what they are how they are to be installed (orientation of the cutouts).

I wouldn't use them. But, if I did, I would stack them so that every second plate was 180 degrees opposite the one that preceded it. The next plate could be anywhere as long as the one that followed it was opposed to that one.

Remember that the clutch ends up spinning at up to 4000 RPM. You don't want to encourage an imbalanced condition.

wow, I wouldn't use that in my tractor.

I wouldn't use them. But, if I did, I would stack them so that every second plate was 180 degrees opposite the one that preceded it. The next plate could be anywhere as long as the one that followed it was opposed to that one.

Remember that the clutch ends up spinning at up to 4000 RPM. You don't want to encourage an imbalanced condition.

Yeah, that method seems like it makes the most sense. I have no idea why they would have all been lined up when I took them out. At least alternating them 180° the imbalance will be kept to a minimum.

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