The sad part for the warrior is the 329cc rancher puts out over 20 ponies quietly.

 

yz250wr i own a warrior to a 2003 and am wondering the same thing now i love my warrior and it has never let me down... and a friend of mine has a stock Z and i am wondering how to make my warrior beat it now.. and everyone says u cant... but there has to be a way with out doing motor work.. i was thinking spending 300-400 $$ now and then get the new honda a year or 2 after they come out if they do!.. or get a rappy .. but i dont get it eirhter why 50cc makes a differecne.. but hey one day the time will come again and the warrior will rule after all these new sportquads break down and we can ride by , smile and wave as these guys with there new 1st or 2nd year quads sittin in the garage and cant figure out wats wrong!

 

You say why dont they make it faster stock... well people like what the warrior gives for the purpose it is suposed to serve, trails. The 400ex and what not are made for racing, so they put a slitely better cam in it, maybe more valve's in the head (just a guess dont know for sure) and possibly beefier carb's. It's not all based on the CC's its the other engine parts that limit the vihicles performance more power = less reliable. you can look at modded banshees and modded, well anything. They just wont last as long, as for the warrior those things are tanks that damn well better last forever, excluding a few tranny problems. I started on a warrior i loved the thing to death, beat the crap outa it. Now i have a raptor and love it, broken tranny right now, she'll be together this weekend. Ive had 2001 raptor for a year and a half now, love it but it broke. ive had the warrior for 3 years and only 1 problem to complain about. Thats slipping outa gear when riding. The more ponies you start to push the less reliable youll get, is what im trying to say. The warrior isnt built for racers who like to rebuild all the time, just for people to bash around and have a good time, so they made it last. Now i know there are prolly some high horsepower quads that are reliable, just stating in general. just some food for thought.

 

AMEN!

 

Yamahas Biggest problem: My 87 Warrior's engine is almost identical to the new models. The Chassis is about the same exept some reworked A-amrs, swin-arm linkage, carburator, and a repositioned motor. Otherwise, the shocks, engine, steering, and over all apearance has not changed for the past 16-17 years. If yamaha would produce a new Head for the warrior cylinder, it would make it a whole new machine. It is like putting high performance 350 chevy heads on a 400. It will just open up the engine. Any automotive designers here?

 

I think its more of a production type issue. Obviously, Yamaha could make a more powerful 350 but they have been cranking out virtually the same Warrior for 16 years......I say hats off to Yam for creating such a long lasting and popular machine - even by todays standards. It is definately time to update the warrior (or replace it) but if ya think about how long the Warrior production line has been running it's amazing. With no R&D and other intro costs it's a cash cow. I'm guessing Once sales drop they'll get off the dime.

 

wouldnt it be nice if some company made a 4 valve high flow head for the warrior? It could make massive power. Even with the lil 2 valve head, 40hp wouldnt be too hard with the right parts and porting. Think of how rich you would be if you made an aluminum, high flow, warrior head that bolted up to all the stock parts but made massive hp (with exception of maybe a dif cam chain , other than that a drop on piece with your choice of camS).
Oh and to the guy who wanted to beat the Z, it will take a bit more than that, it will take around a grand. Probably a 450 cam, 11:1 piston, bigger carb, ported head, maybe bigger valves if you can get them, then the normal stuff like pipe and filter. Those mods should be enough to get in the mid to upper 30s and give the Z a beat down (not just beat it, make him cry). For around 600-800 you can match its power with something like the alba kit + porting or the 4wt kit.

 

You want to know why 50 cc's makes such a difference. It is the same reason that a 2.0L 1990 Ford Escort has abour 130 HP and the Pontiac Vibe has ~180 HP. It's not that Ford can't make a more powerful engine, it's just that based on cost, R&D, target market, etc. - that is the engine that the execs decided was right.

It's also the same reason that Dodge's Ram 5.9L (360cc) only made 255 HP as of last year, and Chevy has a 350 in their Z-06 Corvette that makes 405 HP. The reason is - they are intended for different purposes.

This is the answer to your question. I hope this helps, and I hope you are not just complaining for the sake of wasting time and arguing.

RR1

 

first off, anything that inspires thought is never a waste of time. Thats what I am trying to do, inspire thought.

second, being a warrior owner myself, I would have liked to have seen yamaha tune the engine better so that the 50cc difference between it and the 400s werent miles apart in performance. if 400's can keep up with the 660, then the 350 should theoretically keep up with a 400 pretty easy. truth is, it doesnt unless you mod the thing to death.

third, I would really like to know, why cant a 350 hold steady with a 400.

forth, a four valve 350 head would be nice.

lastly, yamaha doesnt have anything inbetween the warrior and the raptor. That is why I would like to see the warrior updated. (as nice as they are, banshees don't count)

thanks for all the posts so far...[img]i/expressions/face-icon-small-smile.gif[/img]

 

YZ- was your 3rd question in referance to me? If so i will shed some light on the subject, but in more basic terms.

-AIR FLOW- yup, that is it. And the fact it is a stroker engine too.

How much can the head do for an engine?????
While i was pondering on how to squeze some more power and efficiency out of my jeep engine i came across something. It was an artical about putting the new high-output 4.0 Jeep head on the older 4.2 engine. The Blocks are the same size and with a few modifications the heads are direct fits. The basic Flow of the unburned gasses of the 4.2 head in a sharp 90 degree turn to the valve. This casues the air mixture to de atomize making it harder for a strong burn in the cylinder. While the 4.0 head has a 45 degree turn keeping the particals held together making the burn more compleate and clean producing more power. Also it has a smaller upper combustion chamber keeping the power in one spot making it more consistant and causing it to rev much more.

there are also things like diffrient porting, stronger valve springs, and an all around sound head.