I have had my raptor 660 (04') for almost a year now and I have added a few mods, FatBoy4 exhuast, 2+2 dominator axel, plus airbox and jet work and I am pretty happy with it but I want more power. However, I want more power that is reliable. I am not very mechanically incline particularly with engines but I am learning so I wouldn't be able to do anything my self just yet. I ride only for recreation but I ride very aggresively and would love to have more horse power. Any suggestions, I want to spend about 2,000 or a little over. I have looking into big bore kits and was wondering can they cause the quad to become unreliable. Someone once said in the forums: "If it doesn't scare you to ride it, it doesn't have enough HP" I couldn't agree more.

 

the problem with reliable big bore kits is very simple, they cost a lot more to make them reliable. This basically means the rod.

I'm sure that there will be plenty of people chiming in here in a minute to tell you to call bob craycraft, so I'll go a little more in depth.

If you dont plan to do the work yourself this kind of thing gets expensive fast. Shipping can take up a pretty penny and the rod itself is about 250 bucks not counting any balancing you may want done with it and the piston. But if you want reliablility this is a must, so just take it as a given. If you are only planning on recreational riding I would imagine that an 11:1 compression ratio and premium pump gas would be the most convenient and availible. You can still get a lot of power out of this setup because of the bore, cam, and porting.

So call bob, or kenz, or anyone else that someone may list and see whats out there, and what they are charging. Then you can analyze what you want and exactly how much you want to spend on it and take it from there.

Trinity
Roberston
Powroll
Sparks
There are a few more builders. Some are much better than others, but its still useful to call and find out what each can do for you.

 

CRAYCRAFT

 

SlueFoot,

What torque did you use to tighten the axle nut on your RPM axle? What about the locking screw? Did you use any loctite?

How do you like the Dominator axle? What width are you using?

 

I like the RPM axle a lot. I am not shure of the torque used to tighten the locknut bolts because I did not install it. They did however come loose after I rode for about 3 or 4 weeks. I called Dirt First, where I had the work done and they recommended just tightening enough with your own stength but NOT to overdue it and strip it. The axle gives 2+ inches outward over stock on each side. I ride a lot in the woods so I didn't go with anything wider than 2. However, if i wanted to do wider I could always add 2" extenders to have 4" total in the back. I think that would be kinda overkill though. Over all the axle is very tough. I weigh about 280lbs and am 6'6" and I like taking big jumps and sometimes I land a little sideways which bent the stock axle. The elka triple rates up front also help with my bigass coming down on the Raptor. lol

 

Thanks guys,

Just got a call from the dealer and the RPM axle has gone up $70 CDN(extra charge for the lifetime warranty according to RPM). So the rpm along with the required aftermarket axle nut is $140 more than Lonestar. So I'm going to get the Lonestar and use the stock axle nuts for now.