Which would be the fastest? Would it be like when they are stock, YFZ beats Raptor, but Raptor has more top end,or would roles reverse?

 

Probably the same.

The YFZ can beat it off the line, but the Raptor takes it for being faster

 

NOPE, have to disagree. I have both, modded both, except the difference between them is the yfz has a aftermarket front sprocket (15 tooth). The yfz creems the raptor everywhere. The race is over at the starting line. From what I have tried, you cant go up a tooth on the front on the raptor, because it makes it way to sluggish off the line. YOu can however go down, cause you do have enough topend to play with. However, that still doesnt beet the yfz. Its atleast closer off the line, but nothing will beat the lightning fast throttle and lb difference the yfz has, not to mention the arm ripping mid range. Its pretty easy to realize if you think about it. YOu have two quads, making close to the same horsepower, when modded with bolt ons/cams, and one is 50+ lbs lighter then the other. I say + because It is extremely easy to make the yfz a 335lb dry quad, and you can still drop a lot more. The raptor however does not have a lot of weight to lose. The raptor needs a lot more horsepower to compinsate for the 50-65lbs of extra wieght.
Still love my raptor, but in order to get that thing to beat the yfz, its is going to have to get the 727 kit put in. THen your talkin some horsepower.
.............but as far as the normal mods (exhaust, intake, jetting, cams) the raptor will not beat the yfz. SORRY. And to all those who come back and say "rider makes the difference", well, yeah!! BUT were not talking rider against rider, were talkin machine vs machine.
Get the 727 or put nos on the raptor, then your talkin. the 686 doesnt do it, against my yfz in its current state, either. Then your also talkin reliability and longevity issues possibly rising.
IMO, the raptor is in a totally different class, and shouldnt be compared to the yfz. I love the raptor for trails, has reverse and is pretty comfortable.
IF, however, you do choose to go nuts with mods, and are looking to get serious horsepower for drag racing, then the raptor or banshee would be the way i go. Then you can go straight really really well, and beat as many yfz's as you want, till the first corner or woop section.
Havnt seen it yet, so cant comment, but wonder what the yfz 508 will do against the raptor 727??? Cant wait to see that one!!!

 

grrr wheres that link to the 686 vs yfz video....

 

With my 686 I haven't had a problem with a YFZ to date. They usually run in the 5.3 or 5.4 range, even the yfz470. Most built Raptor's dip into the 4.9's and 5.0's with the faster Raptor's going all the way down to 4.281.

 

My Craycraft Signature 686 didn't have any trouble with piped/jetted/filtered YFZs as long as I had enough room to get into 3rd gear. No contest at all, I could reel them in at will. This was on a MX track - uphill, downhill, flats, etc. For short distances though, YFZs are surprisingly fast.

 

My raptor didn't have trouble with YFZ's (piped and jetted, nothing more) before I bored it. YFZ's are agile little machines and probably the best factory MX racer ever. They are not, however, some "SUPER BIKE to rule the industry" (seems like a sinister evil scientist type laugh is needed here). They are fast, but perform exactly as you would expect for a 449cc high compression engine.

~HoundDog

 

Very well said Hounddog.

 

I have been reading ATV Connection for awhile, but this is my first post. I had to reply to this one becuase I own both machines being compared. I have a Trinity 727 Raptor and a YFZ, that being said it is my opinion that the YFZ is going to be hard to beat.[img]i/expressions/face-icon-small-shocked.gif[/img] I havn't raced mine directly (Raptor is down with another J&E piston failure). But I have raced at least 3 other 727's and several 686's as well. All of my racing has been at Sand Mtn Ut. Any body thats been there knows the hills are steep and long. So hears the bottom line. The Raptors all ran hard, But all but 1 of them was looking at the back side of the YFZ. I would trade wins with the other. My YFZ is running a Rotax full race pipe, Ron Woods (Rotax) race intake, cam mod, YZ dirtbike needle and rejetted. ( I wiegh 190 ) Flat drags may be differen't, but as far as steep sand drags go the YFZ is going to be a force to be dealt with.[img]i/expressions/face-icon-small-wink.gif[/img]

 

Sounds about right to me. Though, I am really surprised to hear that the 727 didnt do better, I thought those things where fast, thoug I have never seen one. I have just had experiences 686's, and havnt had a problem. They definately are fast, but not fast enough.
My mods are as listed below