686 kit for rhino??

im wanting to know is it worth doing a 686kit on a rhino 660? im wanting to find out if the kit is durable and reliable i dont want to have to rebuild it a yr down the road from now. also you that have had the kit done how well does it spin your tires. im wanting to run 30" mudlites but i dont wanna be bogged down when running the 30's. thanks

The 686 has generally been a very reliable build. I'm sure it depends on who is doing the work and who's kit it is. You can see that folks converted 660's to 686's for many years so successfully that Yamaha made the 700 which is a 686. When you get up into 727 kits there can be jetting issues / overheating problems.

I can't speak to the added power, but Ridepate just did one and he can speak to that. Based on what I've read, he is extremely happy with the build and added power.

As far as turning 30" tires on a Rhino.....I'm "agin" it. I personally wouldn't go over 27"....I've got 26" on mine. I've got a 660 Grizzly with 29.5 Outlaws on it. In certain situations, it is just too much and the Grizzly is half the weight of a Rhino. I've got a Gorilla 6" lift on it primarily for the Gorilla axles so as not to break parts. I also did a Gorilla rear drive shaft as I shattered my stocker.

Anyway, if you are putting 30" tires on a Rhino, it is my opinion that there will be lots of issues to attend to down the line including jetting.

That's my opinion on a slightly different but similar platform.

Just know, it will involve some ancillary work. Good luck to you, Matt

I'm impressed with the 686 so far. IMO don't skimp on parts, that's the key to a good build. I've seen kits on E-Bay for as little as 160.00.........Just the stud-kit for mine cost a little over 200.00. Of course I did not go full-blown with os valves and head-work.
I'm with Tiger on the 30's, mistake IMO. Unless your just a putter, which most of aren't, you will suffer great power-loss, and sooner or later will blow the center-drive gear and support ,then axles , so-on and so fourth....Yeah it might look cool, but the cool-factor fades when your on a tow-strap...........

i too am looking to do the 686 kit
you can either piece togther you own kit and have the cylinder bored or there are a few kits on the market that include a cylinder already bored.
both these companies offer complete kits

www.kmsperformance.com

www.trinityracing.com

Forget the 30's. 24's rule. Heck -- drop down to 23's and you can out accelerate the 686 kits with 26's....

I recommend the JE pro piston, mudbuster cam and gasket set.

hunterworks is there any boring involved or is it the same size piston if no boring i take it that its just a higher compression piston

Boring is invloved lawn, your going from 100mm to 102mm. You can leave it stock-bore and just add a hi-comp piston and cam, you'll see better bottom-end results from that too!!

im gonna look into it. im wanting to be able to spin my tires with ease

Most likely you will need to bore, hard to get me to put a stock size piston in a tired bore.