Whats the difference between the 660 r and yfz 450

[Modded660R2fast]

What is the difference between these two bikes and please get into detail because iam trying to figure out why the 450 is so much faster then the 660 and i hope the 50 lb difference isnt that big of a deal. What allows the 450 to be faster then the 660 such as carb, cam, compression ratio, stroke etc i just need to know.

[350Xccelerator]

www.bluetraxx.com is the place for you my friend

[Tri-ZNate]

compresion is alot more since you have to run race gas in the YFZ.

[TravEX]

modded660r, pick up some magazines, search online, and really decide what you want in a quad, personally i would go with the YFZ. what kinda riding you do?

http://www.yamaha-motor.com/sport/products/modelspecs/323/0/specs.aspx

[BigAir660R]

first off you dont have to run race gas in the 450 i dont know where you heard that. secound look at my reply post on your first post about making a raptor faster. I seee this first had where i ride and ive had the same problem untill my raptor got totaled out by another person acting stupid! So i solved the problem and got a SHEE! nop 450 where i ride can touch it. its a stock bore, stock carb bike that pulls about 65 HP! All it has is a nice port and polish +6 advance on the timing and a nice set of in-frame CPI pipes and slip on K&N's with a +6 swinger. Will hit about 100mph with the gearing it has now. its alittle sluggish of the line but when the powerband hits CCCCCCCCYYYYYYYAAAAA!!!!!!!!

[Modded660R2fast]

Well how much hp will i see if i get the 686 kit, cam stage 2, and port + polish. How much total power will i end up with if iam already making around 45 peak hp?

[BigAir660R]

with a 686 you can get up to around the mid 70's if its tuned right. ive seen stock bore raptors with a damn good port job and your usual bolt ons hit close to 60 hp. your normal 686 bike runs in the mid 60's though

[Modded660R2fast]

What about the 740 kit?

[BigAir660R]

the 740 is alot faster and from what i hear isnt that much more like only 400-500 more. ive saw a 740 run also and it is the fastest raptor ive ever seen. not shure on the HP rating though. i would think around 80 or so though.

[Modded660R2fast]

Is the 740 kit reliable or is it going to ruin my bike in a couple of years or something. What is the best kit for reliability and cost and also what manufacturer makes a good kit?

[Modded660R2fast]

Also will i ever be able to hand with like a 250 2 stroke dirtbike with the 686 kit or do i have to get the 740 kit or will the 740 kit not be enough even to hang on.

[BigAir660R]

if * cant beat a 250 in the dirt now then * have a problem. and the 686 should kill one. Id go with craycraft. look it up its like craycraftracing or something like that they in texas so youd have to send your motor out.

[ATC crazy]

Whats the difference between the 660 r and yfz 450


Everything!

[1984kxtTECATE]

Just keep in mind when ever you add more power you will lose reliabilite, I think the 740 kit is awesome but i really dont think it will last to long before grenades the whole motor, and with the power it makes youll probably throw a rod right threw the case.

[MTS]

80 hp,,,your on crack, 60 is closer to it, as for the big bore's after the 686 the transmissions tend to **** out on you with the massive top ends, stay the HELL away from the 770 its a ticking time bomb,

[skippy]

i love my yfz, i had two raptors in the past.. and they are VERY top heavy and heavy in general.. it will make an ok trail quad, but my yfz has soo much more snap... you would love one.. reline the seat, respring the carb for a lighter thumb and you will never turn back!

[Modded660R2fast]

YEAH THATS NICE BUT ICOULD ONLY AFFORD A RAPTOR. I GOT A 2001 RAPTOR WITH THE TRANSMISSION UPGRADE AND ITS IN EXCELLENT CONDITION FOR 2300 BUCKS SO ITS WHAT I GOT. All i want to know is what exactley is the difference between the two bikes and no one really gave me an answer please can someone help me out!

[BigAir660R]

ive already gave you the answer in 2 different post so im done helping now!
all and all it dosnt really matter cause the 450 will always be faster than the 660! so deal with it! I did and got a banshee.

[Tri-ZNate]

first off you dont have to run race gas in the 450 i dont know where you heard that.

Ok I'm not trying to be an ass or anything but BigAir660R I got a question. At what compression do you start running higher octane fuel? Because the 2004 and 2005 YFZs are 11.9:1 compression stock and the '06 is 11.4:1 stock.

[BigAir660R]

all i know is that i know quite a few people with 450 and NONE of them run anything higher than 93 octane. also i dont think it says in the manuel anyware to run race gas. I really dont see them making a quad that requires it either. But i will aask a few friends to see what they saw about it. What about skippy up above he has one and i bet he dosnt run anything higher than 93. Anyways who knows.

[skippy]

i have run 110 thru the yfz, does it need it,, NO.. usually i run 94 in there and they are quite happy..

[corndawg]

YEAH THATS NICE BUT ICOULD ONLY AFFORD A RAPTOR. I GOT A 2001 RAPTOR WITH THE TRANSMISSION UPGRADE AND ITS IN EXCELLENT CONDITION FOR 2300 BUCKS SO ITS WHAT I GOT. All i want to know is what exactley is the difference between the two bikes and no one really gave me an answer please can someone help me out!
hey man i think your caps lock key might be stickin just a little bit :lol:

[Modded660R2fast]

Oh i know, its crappy. What do you guys think about me getting a cam for my raptor. Should i get a stage 1 or 2? How hard is it to install and can i do it with my engine in the frame? I have the following mods k&n, jetted, Alba pipe and big gun rev box. How much of a gain will i see compared to my pipe/jet install. Will i really notice it or is it like putting a high comp piston in where you dont see much difference at all? I heared thart only if you have sertain mods should you get the stage 2 cam other wise you actualy lose performance or something. How are the cams each during Low end mid and top end acceleration. I appreciate who ever can answer these questions. Also how will it compare to a yfz 450 with the best cam?

[BigAir660R]

dosnt matter if you got a pipe, filter, jets, rev box and a cam, you will not be able to hang with a piped, filtered, and CAM Modded 450 its realality so just get over it. only way you will beat a 450 is to go bigbore as i told * before otherwise save your wasted money for modds to the raptor, save some more money. Sell the raptor and buy either a 450 or a banshee. But if you must have a cam the id stick with the stage one,w/ the mods you have done. Most people dont go to a stage 2 unless the have a high comp piston or go to a big bore, plus with the stage to you have to buy a spring and retainer kit wich isnt cheap about $200. plus what the cam costs.

[Modded660R2fast]

I thought if i got everything the 450 has engine wise like high comp piston huge cam etc it would be faster then the yfz 450 with those mods, cause if both engines have the same performance mods then the bigger ones faster right. I know the 660 is choked up stock and once you free that up its a lot better. Does the 450 suck in more fuel and air then the 660, or does it just combust so much faster it does almost twice the work of the 660?

[SpeedBump]

I am not wanting to start a pissin match here, but I Drag Race at organized events and I got an opinion about the Raptor VS the 450. Stock for stock, no question....450. Now, the thing to remember is....a 450 is basically in a VERY high state of tune from the factory where as the Raptor is choked down for the masses. You can add some stuff to the 450 and get a performance boost, but not as much as one would think. There really isn't anything major that can be done to it and have it remain a 450. You can bore & stroke them and such, but then there goes the relaibility factor. (No, not just a bore & stroke will do it, I mean the overall reliability after extreme modding) The Raptor on the other hand...lots of room to play. Cams, porting and airflow are very easy things to do with it and give BIG results. I have seen Raptors with just those mods walk all over Piped/jetted 450s. They turn faster ETs AND higher MPHs. (If they have the bike setup right...like stated before, tippy and topheavy) The timing lights don't lie. I think both machines are good at doing what they were designed to do. The 450 is a RACE bike and the Raptor is a TRAIL bike. I know from experience...you can build a Raptor to be as fast or FASTER than the 450 without that much work and still have a good solid reliable engine. Just my TWO.

[brapp]

Raptors Holdonto Your Starter Clutches. Most Of The Ones I Ahve Seen Dont Wanan Start With Stock Motors Mutch Lkess Modified Ones!

[BigAir660R]

yep i had to replace mine, and almost every one ive seen has had to be replaced or will at some point. Oh and if you do have to replace it besure to get the RSP aftermarket one cause if you put a stock yamaha one back in it, it will tear up again!

[brapp]

On Most Of The 770 Bikes Ive Worked On You Get Mabey 2 Dozen Starts And Then Its Gettin Torn Apartto Get A New One And The 770 You Have To Put A Lawnmowerbatery In It Just To Crank The Damn Think. The Stock Batery Is Useless For Theanythign Over The 727 Kits.

[diggerzmound]

The Raptor has a big torque slower revving engine..
The 450 is a lightweight rotating mass engine, built to rev like a 2 stroke. The geometry of the 450 suspension is dialed in for mx. THe raptor is more of a trail machine..

[Modded660R2fast]

Thank you so much that explains so much to me now i know why they rev so fast and how they make so much power thanks. Iam being serious also dont think iam being sarcastic. Thanks man :Bounce