how do i know if i already have a sheave.

My 660 is pretty fast it stays right with my buddys rzr 800, what i know the rhino has is a k&n with a outter wears, full alba exhaust, im sure its been jetted cuz it runs correctly, dynatek cdi, PWR oil cooler and radaitor, I have 27" big horns tires and i can hit 70 on the speedo but im sure its way off, any how i keep hearing of the hot rod sheave and i wanna add one if i dont already have some sort of clutch, the rhino has a 4K dollar hrc long travel kit so its hard to think it has a stock clutch if someone spent the money on it that they have already,

When you service it, take a picture when it is clean and post it up.

see if its in kph too...yep pics

Unless the motor has been race built. I really don't see 70mph on a stock motor. It's gotta be in kph. Mine will too out at about 58 -59 on flat blacktop. I think my speedo is a lil off. I have 26 in bighorns. Jbs everything and msd 3d box on a stock motor

x2  clean it an get pics

It was in kph lol i got it switched over and gonna run it tomorrow and see what it does, them ill pull cover off and post a pic of the clutch, thanks for ur help guys!!! Im kinda hoping the clutch is stock its fun now but we always want faster !

With a cam and sheave that's right where I'm at...800 rzr accel and 59 mph top end on flat.  I would say if it stays with a rzr, either you have a hell of a motor, or you have a sheave and cam, or said rzr has no driver.  Unless you are on tight woods trails.  In that case, a stock rhino with a good driver and properly adjusted shocks will hang with a rzr.  Tight turns on 10-35 mph trails a rhino is very hard to beat.

You need to find out what you have so you know what to do next.  Welcome to the site.  Get ready to spend some money because this is a real bad addiction.

ADDICTION? Yes Sir!
Thanks to all of you guys on this Forum I have spent close to $3,500 in 6 months and I still have a 2nd Rhino that is pretty much all stock.
BUT even after all of the mods on one Rhino and buying another Rhino with a junk motor I'm still in it less than what a RZR would cost and reliability is there.
Can't wait until the Stroker is done so I can WHOOP some pooplaris ASS...