BTW, if you were to take a piped and jetted 660 and simply sleeved it to 686 making no other modifications exept the necessary richening of the jets to compensate for more cc's, you would see a less than 4% increase in power. Power and torque are directly relational to displacement if you make no other changes. The advantage a 686 kit would have over the 700 is everyone who installs a 686 kit ports their head, improves their cams and raises their compression. Most piped and jetted raptors with intake make between 40 and 45 rwhp. Take the average of 42.5 multiplied by 1.04 and that is what the additional 26cc's will give you with no other mods. That is less than 2 hp. You gained more with your pipe. In case it isn't obvious, I used 4% because 26cc's is a little less than 4% of 660.

Ron

 

Ok, not quite sure where this comes into play. Are you saying that there shouldn't be much of a power difference between the 660 and 700? Because its not a aftermarket build up? Maybe not HP but it would give a little more torque and it does.

 

It is relevent to the posts claiming a 660 with a 686 kit would be faster than a new 700R. The 700R has more going for it than just displacement. You will notice that a properly tuned 700 with a pipe and intake making anywhere from 47 to 50 rwhp as are the claims, a properly tuned 660 with pipe and intake and an additional 26cc's with no other improvements based on the math from my last post should make from 42 to 47 rwhp. It is a silly comparison to begin with because to be fair, you would sleeve the 700 up to about a 715 (4% increase on 686) if you sleeved the 660 up to 686. That would be a mod for mod comparison.

Ron

 

I see what your saying, and you may be right. All I know is stock to stock there is no question that the 700 is faster than the 660. But mod for mod I have yet to see. It would make more sence that the 660 motor WOULD make more power, or atleast feel like it does, if properly jetted. The going away from the 5 vavle head, in my mind was a big mistake, and one that was probably made for EPA and legal reasons. That 5 valve head is yamahas thing. It is a proven design, and must work better than a 4 valve head, otherwise why do it. Its just making machines that much more expensive and putting that many more moving parts in a motor. The 5 valve design is used on all there high performance motors. The street bikes, dirt bikes, and the yfz and raptor.....up untill this year all utilize the 5 valve head.
I personally think, with FI around the corner for everything, that it is going to get harder and harder to do mods on the machines. It is just like what happened with cars. Sure, you can still mod new cars, but it takes money to do it, and it usually isnt nearly as easy as there are little sensors and electic crap all over the place.
I thought about this very thing before I purchased the 700, and the reason I still went with it, is I am not planning on any huge mods for the 700. I bought it for a comfy trail quad and FI sounded great for a trail machine, as you go up and down in elevation quit alot out here in the northwest, when you are out putting some miles on.
Look at how much more money has been spent doing intake and pipe for the 700, over the old raptor. A couple of bucks in jets and you where ready to go. NOW, its a couple of hundred dollars to "jet" the machine!! I think with FI, comes more ways to restrict power from the machine, as EPA laws and regs are getting more and more restrictive.

 

Actually, there are plenty of pipes out there that can spit out 45 rwhp for the 660.Take a ct pipe for example, that pipe and jet alone puts out 48 hp.Hmf would put out around 45-46 ish.The right yoshi would put out around the same as Hmf.The Carbon pro would be in the ct sonic region.686 sleeve it and you have 52 or more hp.then port and polish the head and everything else...and you have youself a badass quad there.And you dont need to refer to a 700r bore kit, because that would make it uneven.Keep both quads at the same displacement, mod for mod, and then 660 will come out top.Yamaha obviously didnt think about making it that much better than the 660 in the long run, because it may be faster than the 660 stock for stock, but the 660 is the most restricted stock bike out there, it doesnt even beat the z400 by much stock, but when you let it breathe and exhale, that bike is a monster.Even with a standard bore high compression piston and lightweight rod(im saying rod because with high comp pistons on the 660 on a stock rod...the rods usually fail from what i have seen and heard) the 660 would stomp the 700r with pipe, jet, and pipe, fuel mapping.Hands down.So when you open both of the bikes up, they are about the same, yamaha obviously did not think about the aftermarket needs of the 700 too much if they wanted it to stomp the stock 660 and modded ones.speed does not make this bike a complete failure, dont get me wrong, they inproved the handling by lightyears ahead of the 660, dry weight by 2 lbs, everyone still says it feels so much lighter?LOL?and many other variables that make the 700r a way better bike than the 660.The 660 can be simply modded to fix handling problems, but it also costs extra money after purchasing the bike itself, and some people dont want to do that.If i could trade my 660 in for a raptor 700r, you bet my ***** i would, But i may end up selling it and getting a stock 450 or another 660 to heavily mod with the extra cash i would get from selling the 700.I wouldnt really want to spend hundreds of dollars on a full pipe kit and then another 150-300 dollar fuel map instead of just jetting the bike.It may take a while and be a pain in the a$$ but it is worth the $$$$ave...


~Mike~

 

Also it builds up more compression, the explosion in the cylinder is larger and creates more compression leaving the cylinder.

 

fasterthanyou22, if you actually think that a Raptor can pull those HP numbers with just a pipe/jet, keep dreaming.

I find it funny, you are making things up to convince yourself that a Raptor660 is better than a Raptor700.

Mod for mod or stock for stock, the Raptor 700 is > Raptor 660. Simple as that.

 

Willi, What ever you feel like putting your money into.... Get it. Its all down to personal preferance.

 

If it was me I would go with the 660.

 

Well, why dont you go check for yourself smartass?Look through the other posts and you will see that people say that their 660 was faster than their 700 mod for mod.Well, at least the smart one Ozark....go check out ctracing.com and check out their dyno numbers on the 660.Hmf would put out a good 44-46 rwhp full pipe and jet...PROPERLY.It is pretty simple, yamaha was planning on making a quad that was way better than the 660 right from the factory, they obviously did not foresee that the 660 would beat the 700 mod for mod.The 660 is also cheaper to mod, knowing that you have to buy those really simple to install digital fuel maps, and you have to bust your butt to jet the 660...I think it is pretty worth it.The 660 is a 660cc bike(i said the displacement just for you blazin) and the 700 is 686 as we all know.Now, mod for mod, the 660 will take the 700, we have been through it already.Although it all depends what the mods are, and where they come from.They have to come from an equally popular brand that produces a more-than-average amount rwhp for each of them.Not like giving the 660 a dg system with the 700 an lrd or trinity...like trinity, curtis sparks, ct, hmf, lrd...etc....And if you really want to find out if i am making it all up, go research this, and you will see the numbers the 660 puts out.Just because they come out with a 26cc bigger quad with efi, that doesnt always mean it is going to blow it away stock for stock and mod for mod.I gave the 700 the win for stock for stock, it beats the hell out of the 660.Although i really hate going through this over and over and over again....because it starts to seem as if i am bashing myself when i say that the 660 is the most restricted stock bike there is.It makes me feel dumb for buying it when i say that.But i plan on modding it in the near future, like say lte duals, trinity high comp piston, webcam, trinity valve springs, hotrod and crank kit....I would beat the crap out of any mod for mod 700 and prolly even 450s, im not jumpin the gun for the 450, i havent seen those things run with stnd bore high comp pistons and all that jazz.So i just thought i would lay it down in the most descriptive way i could for you blazin, and by the way...you just got roasted by a 13 y/o...