Whats the difference between the 660 r and yfz 450

**Modded660R2fast** · 08-07-2005, 03:00 AM

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** · 08-07-2005, 03:30 AM

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

**Tri-ZNate** · 08-07-2005, 07:57 AM

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

**TravEX** · 08-07-2005, 10:06 AM

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/pr...3/0/specs.aspx

**BigAir660R** · 08-07-2005, 12:23 PM

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** · 08-08-2005, 01:28 PM

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** · 08-08-2005, 03:36 PM

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** · 08-08-2005, 10:07 PM

What about the 740 kit?

**BigAir660R** · 08-08-2005, 10:41 PM

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** · 08-09-2005, 02:15 AM

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** · 08-09-2005, 02:19 AM

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** · 08-09-2005, 07:03 PM

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** · 08-09-2005, 07:07 PM

Originally Posted by Modded660R2fast

Whats the difference between the 660 r and yfz 450

Everything!

**1984kxtTECATE** · 08-09-2005, 07:27 PM

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** · 08-09-2005, 09:00 PM

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,

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Whats the difference between the 660 r and yfz 450