i dont' see how we should be able to rely on such sources as dirt wheels. i know that i stock banshee will do a lot more than 67 miles per hour. my blaster would do 60 stock. and if a banshee is only 7 miles an hour, there's something seriously wrong with that banshee.

 

As far a speeds go, me and an old ruding buddy/friend have run many machines on GPS's. We got about 67 from his stock 96 Warrior. 56 on a Blaster? Sounds a little low. We got nearly 61 out of a nice looking 97. 87 on a stock Banshee? You are such a liar. We haven't done a Banshee yet, but I feel that they run in the 66-69 zone stock. Sport 400 doing 65-67 sounds about right. Scrambler 500, 64-65 is what we tagged on a nice red 99. Grizzly, well we have done 2 on the same gps, and on one we got to 63, the other only 57. The difference you ask. Tha fast one was a 98, the slow one a 99. Also, kawasaki says the 99 prairie 400 4x4 does 57 mph, not a chance. We have seen a praire break 50. Manufacturers FUDGE speed estimates like dry weights. They are usaually in the ballpark, but off a little. Also, whats this Banshee 350 dude doing running race gas in a stock motor? Doesn't add up if you ask me.
Happy Trails, Shawn

 

87 mph???

Lets see - with stock gearing, the motor is turning 9500 rpm at 70 mph. If you were to go 87 mph, the motor would need to be spinning 11,800 rpm AND be making power.

THAT'S why I personally doubt your numbers.

You see, any time I see someone claiming a top speed, I do a little research. NO ONE can fool math. All it takes is knowing the final gearing, the top gear tranny gearing, tire diameter and speed. That gives you an engine rpm. If the motor can't physically spin that fast i.e., rev limiters etc, then I know the person is full of it.

Why has no one come back with the make model and radar band of the gun used? C'mon. But be careful though, I may have already done some research on radar guns. So I could possibly know if someone were to fake the make and model. hehehehe

Chuck - '99 Banshee

 

I see that there are some definite misconceptions here that need to be cleared up, and some incorrect assumptions made. No offense but your reasearch is quite inaccurate.

The way you came about your claimed RPM's and speeds was entirely an assumption based upon no real hard evidence. What you assumed is that a stock Banshee @ 70 MPH is turning 9500 RPM. From this you must have derived that the ratio of RPM to MPH is 135.71 RPM per MPH. So if you multiply that times 87 MPH you get 11,807 RPM. I would not refer to this a good "research".

Lets just do an accurate example of the top speed of a stock Banshee. 70MPH = 73,920 inches/min. Measured Stock tire circumference = 64 in. So then rear axle RPM = 73,920/64 = 1,155 RPM. Next we can find the counter shaft speed = 1,155 x 41/14 = 3,382.5 RPM. Using this number we can then find the RPM of the Clutch Basket in 6th gear = 3,382.5 x 21/24 = 2,959.7 RPM. I hope you are still following along.... From this we can then get the RPM of the crankshaft = 2,959.7 x 66/23 = 8,493 RPM. FOr some reason that is not quite 9500 rpm as you assumed, the reason quite simply is because the machine does not have enough HP to overcome the forces against the machine at that speed.

Now since the math does not lie... lets go through my machine's math. 87MPH = 91,872 inches/min. Measured tire circumference = 69.75 in. So then rear axle RPM = 91,872 /69.75 = 1,317.16 RPM. Next we can find the counter shaft speed = 1,317.16 x 41/14 = 3,857.4 RPM. Using this number we can then find the RPM of the Clutch Basket in 6th gear = 3,857.4 x 21/24 = 3,375.23 RPM. From this we can then get the RPM of the crankshaft = 3,375.23 x 66/23 = 9,685.43 RPM. This RPM even makes some sense to me since my machine is tuned to develop maximum Horsepower around 9500 RPM.

I hope you are not actually trying to say the Banshee has a rev limiter set at 9500 RPM, because this would not be a factual statement. The only thing limiting the RPM's produced by the CDI are the various electrical tolerances of the components within the CDI. This "limit" seems to be around 10,000 RPM but I have not actually tested this and it can be affected by the charge current available from the stator.

Now for everyone obsessed with the top speed of a stock Banshee it is right around 70MPH give or take a few MPH depending upon testing conditions.

I hope that maybe some of you are open minded enough to concede that it is possible to attain the speeds mentioned previously, just not easy... and anyway I never did claim that it could sustain 87MPH, this was the absolute top speed that could be reached. It only registered this speed for a very short time period.. sustainable and repeatable speed was closer to 84 or 85 MPH..


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<A HREF="http://www.geocities.com/Baja/Cliffs/3856/index.html">The Wrecking Crew Quadz Page</A>


[This message has been edited by 350Banshee (edited 08-05-1999).]

 

OK 350! I think you led us to believe that your ride was stock. You stated stock gearing with slightly larger tires. You never led on there were any other mods. Before this pisssssin match goes further and it really shouldn't I would have to believe the owner of this thread wasn't asking about highly mod designs! It was a nice comment on the stock speed. I'll give you the 70.

Can't we all just get along? hehe

 

He i'm the one that said a Sport 400 Will go about 70. The reason i said that is because i've raced my freinds Sport 400 and he beat me by a little bit. My warrior will probley be in the 65 mph rage (I think so dont jump down my throught if you think i'm wrong) atleast it was clocked at 65mph. Ok well when me and the Sport raced he won. But this was the second day after i got my quad so lets just say i sucked at the clutch. Befor i got my warrior the only clutch i've driven befor that was a 80 dirt bike 4 years ago. Also i just raced my friend's sport today and we were side by side. So my quess is that the Sport 400 will go in the 65 mph range too.

PS: His sport is a 1998.

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Re: Banshee350's post above.

My "research" was directly from two separate dyno sheets I have in my posession that clearly identify MEASURED speed at MEASURED rpm. I do not dispute the math as stated, the only information that I do NOT have is the 6th gear drive ratio. So, my final gear ratio was off. You have separated it out into two sections for both the primary and secondary gearsets (I assume).

So, assuming you gear count is correct, then I stand corrected. Actually, I was hoping someone would. That's how we all learn.

I really wasn't trying to pick on the 87 mph claim to begin with. I really don't doubt it. The whole reason I was discussing the subject was to nail the other people that can't back up their claims, like you have.

Good job.

Chuck - '99 Banshee

 

The Feb 1999 ATV Sport lists these top speeds
(ATV Sport in my view is the best of the
mags)
Banshee 71.2MPH.
400EX 61.8MPH.
400Sport60.6MPH.
500Scram60.0MPH.
300EX 55.3MPH.
This information was procured using a,
Prospeed radar gun w/Speed Tracker.

The July 1999 DirtWheels had this to say
Banshee 67MPH.
400EX 64MPH.
Sport40061MPH.
It dose not state the means used to aquire
these findings.

Unfortunatly I noticed a bit of Anti-Yamaha
sentiment in that issue, one look at the
bar graphs on pg38 clearly show a Banshee
Dominance, yet they choose to in my view
bash it.

An article(if I could call it that)by a Mr
John Arens(starts on page 14 JULY1999 Dirt
wheels) shows a distain for all things
Yamaha(pg 126) to quote him "if Yamaha blows
this one, they better hang it up and stick
to pianos and golf carts".
Gee, dose that also mean they should also
quit making their Best in class Road Bikes
YZF-R1 and YZF-R6 or Snowmobiles, SRX700,
Dirt Bikes YZ250 and YZ400-426F(Five-Valve
Four stroke head, sounds innovative to
me of course Yamaha has had that for years),
and from what I have read, seen and been told
Their Cruser bike's and PWC are also top notch and lets not forget my namesake.




[This message has been edited by y2kodiak (edited 08-11-1999).]

 

Y2! I like your post and belive it. Great style.

 

My BANSHEE will do around 90mph ,but it has a XT600 THUMPER on it!!