Is this what you are referring to?

2005 Yamaha YZF-R1 (YZFR1T) Generator | Ron Ayers

 

There are supposed to be 16 magnets on the rotor.

I'm certainly no expert on the subject, but I wouldn't run out a buy a new motor if all you have is a few magnets missing from your rotor. I had over 65k miles on my '04 and below is a picture of what I found when I did a motor overhaul (completely unrelated to a rotor issue). So this happened at some point and I saw no adverse effect on the bike. The bike still started and charged the battery with no problem.

You may want to drop the oil pan and see if you can recover any additional magnet pieces. I am pretty sure this is the most likely place the pieces would end up.

 

if 16 is the lucky number I'm happy I think ive pieced them all together so far I think i've got it all without having to drop oil pan however I'm going to drop the oil pan tonight.

do you think it would be ok to mix up some good 2 part epoxy and stick em all back in there? my basket/spacer has been thrown out by mistake?

thanks for the help btw!

 

This is a known problem on the 04. Not sure about other years. Had nothing to do with abusing the bike.

Mark

 

This is a known problem for all R1 04 to 08 and some Fz1, Fz8. this is why Yamaha silently updated rotor design with no exposed magnets...
Have a look here for some more details.
http://www.fazerclub.eu/forumx/viewtopic.php?f=9&t=22372

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The broken magnets won't have the same magnetic field because they're basically separate magnets now. It won't be as good as an unbroken magnet, but it would probably do the job. However, do you really want to risk a damaged rotor in the motor? I mean you got lucky this time, you might not get so lucky the next time.

 

I agree. You just saved yourself roughly $2k on a used motor, not to mention labor to install. Spend the 300 bucks on the new updated rotor and never worry about it again. That's what I did.

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so I have done some realistic crunching of the numbers and I'm gonna see if I can scoop up a 05 motor off a board member delivered for a extremely fair price.

Also on a side note.... the new rotor assembly with the new design to prevent "magnets-chaos" and the sator also having a new part number and revision been done, does this mean the whole stator and rotor be changed at same time because of the old part not fitting(first gen stator work with a new rotor 2nd gen Rotor)?

also if anyone wants to buy anything I will be having a liquidation of all and everything I have to buy a new motor. Tool chest, ex girlfriends cat, As well as liver and kidney and bone marrow... So if you know someone in the market I got no dignity, its up for sale as well... lol:bsflag: