My advice to an owner who wants to buy a clutch kit and regardless from what vendor you buy from.

You should at least have the tools  to change the flyweight in the primary clutch yourself because it only takes about 10 minutes to do if you have the tools (puller / clutch hold tool / button holding forks)

Regarding XP

If you dont want to purchase a clutch tool for the secondary then you can have the helix installed by the dealer and / or have the kit installed by the dealer however in the end have the tools to change the flyweight in the primary clutch yourself.
If you follow this guide on secondary removal/installation  - Then you dont have to take the XP sled to the dealer, you can just take the secondary to them to have them install the helix.
QRS install video.
The video link above is for XP- QRS installation & Maintenance video - PT1 .  Look on the right of the page and youll find the other videos 2,3,4.

 

Regarding REV/MXZ

If you follow this guide on secondary removal/installation - Then you dont have to take the REV/MXZ sled to the dealer, you can just take the secondary to them to have them install the helix.

Having the primary clutch tools is also a form of maintenance protection for yourself.  Youll be able to take apart your primary ever so often and check the components for dirt / wear / fitness / health...etc.

I tried to make clutch kit information available so the customer does not have to take the sled to the dealer.
If the customer has to get the install done by someone else whether dealer or friend - the customer should be able to do the primary clutch weights himself
Have a look here how easy it is.
Maintenance video 1
Maintenance video 2
at that page, pick the (clutch maintenance video Pt 1 and 2) only 1 and 2 pertain to you.

Link for HPV-27 (RER) secondary maintenance illustration 

INSTALLATION

If you get the dealer to install the kit that is fine, the secondary kinda take a bit of time doing that job....jusssst be able to change the flyweight yourself if needed and you make yourself more valuable because...
1)you own some tools and
2)youll be able to help friends out that ride skidoos if they have problems say with their stock clutching or whatnot
3) you will learn more and
4)I aint too shabby of a clutching coach for running questions by.
5)I have recovered my tool investment being paid in beer and favorite red wines because of having these tools, some friend wants his clutch taken apart and cleaned and guess what they supply?  haha.

At least be able to change the pinweight and primary spring yourself.  Even if you take your secondary to the dealer that is ok, you will not have to touch it again, just be able to change the primary clutch flyweight.
You can change the flyweight yourself...in the back of a half-ton truck...in the parking lot.....AT TACO TIME.
It is that easy.

-----------------------
I give a calibration on the sheet for say a 180 lbs to 220 lbs operator. What if you are 125 lbs? Then how much flyweight? What if you are 380 lbs, then how much flyweight - Well I know such calibrations that I can offer up no problem.

Note;  I do have calibration suggestions for a wide range of operator weights but what if your engine is stronger than another 800 (higher compression) or what if you have lower compression than a standard 800?
...Easy, do a full throttle pull while looking at your tach - what rpms does it say?
The rpms will tell you which way to go with the flyweight add or reduce and how many rpms will tell you how much flyweight.

Example calibration:
An average flyweight change per rpms is 1 gram = approx 200 rpms under full throttle.
If you need 8200 and are seeing 8300 rpms - then can increase the flyweight by 1/2 gram, changing a setscrew or adding.
If you need 8200 and are seeing 8100 rpms - then can decrease the flyweight by 1/2 gram, changing a setscrew or removing.

In the final analysis - IF your garage is your cheque book and pen, THEN I don't know if you would want to venture away from stock.  All you'd ever have to do is pull the chord, drive the sled, change belts and add oil.

I would say have the confidence that you can do this and usually only about once or twice after getting the kit installed.
If there is more playing than that, then it could be troubleshooted, engine management?...fuel delivery?...mechanical problem...etc. That is what the seller helps out with.

What I speak of here ( tools ) is an "investment", I don't know what more to say

With warm greetings
joey