Ok here's the deal. I have an 07 660 with dragon fire CDI and air filter adaptor. I also have HW 18gram greaseless primary weights with the HW orange secondary spring. All turning 26" tires on 14" rims. My cousin has an 06 660. Bone stock with 25" tires.
In a drag race, he gets me off the line all the way till his rev limiter kicks in. WTF. Do tires an inch taller and an inch wider than stock really make that big of deal.

your also running 14" wheels yes they make a big deal

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Drive it like you stole it

So it's all the wheels and tires you think?

if u wanna keep those big heavy wheels u will like sum 14 gram total weight weights,

u atleast need 16 gram total 18 is stock

and yes heavier rotating mass on these under powered rigs is a huge down fall

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2013 MAVERICK XRS - 40'' LED LIGHT BAR - RUGGED RADIO - TURNKEY TIE RODS - UTV FRONT GUSSET KIT - SKAT PADDLES - BLINGSTAR DOORS - GPS -

had - 2007 Rhino 660 se !

going from stock tires to my 26-9-12's I like feel a power loss.

put a JBS sheave in it, you'll get your power back and then some!

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Never Lift
Rutting Rhino premium fuel kit (click here to check it out).
JBS Hot Rod sheave-700 OEM belt-700 cam plate
Call James! 304-673-2602 (shop) 304-877-3419
Two Bros Duals
26-9-12 Trilobites
Water Temp gauge--Oil Pressure gauge

ditch HW's b.s and call JBS, he will lead you in the right direction. James runs his business as a passion, not a necessity. Check out his vendor section, I have not found a bad review...anyone?

Thanks for the help guys. I actually contacted James earlier this week. I've got a trip planned this weekend, then I'm sending him my sheave as soon as I get back.

Do they make 14 gram OD weights? Do I want OD weights?

yes.i have them with alum. inserts...dan loves 14s in his..ODs dont have roller flop and i mill the sheave to have the best bottom end possible with the ODs

hell yes! I have 26's and a 4 seater and the 14's get me going much quicker! it REALLY surprised me in the dunes, where it's maximum load on the motor, went everywhere I wanted!

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Never Lift
Rutting Rhino premium fuel kit (click here to check it out).
JBS Hot Rod sheave-700 OEM belt-700 cam plate
Call James! 304-673-2602 (shop) 304-877-3419
Two Bros Duals
26-9-12 Trilobites
Water Temp gauge--Oil Pressure gauge

Awesome. Thanks guys. James I'll get my sheave sent out to you Monday.

^^What he said!!
I have the same setup. 4 seater w/ cage, 26" tires . The JBS sheave w/14g od's were the ticket!!

make sure you put your name in the box and that it is to be milled and your phone #...thanks james

thanks guys!!

Tires make a HUGE difference. A CDI basically only increases rev limit. THe producers love to tell you the spark energy is higher, and better starting, blah blah, all BS.

it does increase rev limiter and thats it. your tires will KILL your acceleration unless you get a JBS machined sheave. I have one, they're awesome and really help gain back your power loss from the tires and then some.

good luck

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2011 Yamaha Rhino Sport
JBS Sheave 16gr OD weights/ Orange Spring
2D MSD Charge with Bazazz fuel controller
Rhino Stage II cam
Dual Muzzy's w/ whisper cores
27 XTR's on 14" ITP's, 2" CFM Lift

What's your guys thoughts on a 700 cam plate?