Is it possible to install Polaris p-85 primary clutch and a TEAM secondary on my ZFotse 800?

I would say anything can be done with enough effort but negative reports are coming back on the wet clutch delete kits. There is plenty you can do with the clutches you have now and I would try that first before you go down that rabbit hole.

[2015 Z Force 800 53/Trail EPS]

Yeah with the tune-ability these have, absolutely try that first. It's pure amazing the difference just re-clocking the secondary alone will do.

A there a slug kit for these? I clocked my 2nd and there is still a delay in engagement.

I am very familiar withclutching as I have been racing snowmobiles for many many years. I raced watercross for the last 12 years and clutching was a huge part of performance. As for trail riding I would add more wait till the motor could not pull the RPMs thus increasing the efficiency fuel economy and all around performance as for the secondary that was used for back shift for a full shift out not sure where these clutches one of these days I will find out