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Stock clutching? What rpm is it engaging at?

Is it a d&d single or the factory single?
 

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Jetting specs right from D&D.

ZR 600, Single Pipe (Round Carbs) = 440 main jets, Single Pipe (Flat Slide Carb) = 370 main jets

Single Pipe run @ 8200 Rpm's, Twin Pipes run @ 8200-8400 Rpm's

When installing Powerbreather go up two on the main jets.

You should be 460 or 390 depending on which carbs you have alos +/- a size or two depending on you temp and elevation?
 

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tss could be the problem. almost always is on the zr chassis
 
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