You'd have to be dry-rocking those shifts at some really odd RPM's to be able to break a shift-fork that quick. I'd drop it off at the dealer, and make sure they cover it under warranty
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I'm not arguing with you in any way and I do agree that he should take it to the dealer and have it fixed under warranty work if it is possible. I'm just drumming up conversation.
I've never heard of "dry rocking"... what are you referring to when you say that?
I'm going to talk about shifting here for a little bit too. I don't see that a broken shift fork can give the a feeling that the shifter shaft is broken. Even if a shift fork was broken or bent, it would still feel like it is shifting gears due to the shifting star(#26) and the stopper cam(#25) running together. They give you your stopping points and are what makes the "shift" feel to your foot. Also, there is no way that shaft can be broken. Too many other smaller components to go first. A one thing that would tend to go on the z400 is the stopper arm(#25). It would tend to bend over easy with hard abuse. There was a guy out there that was welding a gusset at the bend to stiffen them back up. There's a lot of other things it can be of course, I'm just throwing up ideas from past experience
My old kfx motor that I had to tear apart. It was a shift fork issue, but the shifter never did get loose.....