does any1 know the ACTUAL top speed for a z400 besides guessing?

 

not likely

 

Your question is a loaded one.
Too many factors to take into account. Weight of rider, aerodynamics of rider during speed run, tire inflation, tire compound/pattern/weight, hardness of surface riding on, etc.
You could get 20 different answers, all accurate.
A good guess with everything working out to the Z’s advantage would be 60 MPH or so.

 

hey, give me a list of all gear ratios, approx. top rpm, and tire size and i can give u the most accurate speed w/o actually testing it. i tested this method on my 02 Grizzly and got 67 and tested it gets 69. tested this method on many other bikes too, and it is fairly accurate, depending on tire pressure, weight, etc.. like the other guys said.

 

68mph is where mine hit rev limiter

weight 160
tires 20in Razr 2's 4lbs rear and shredders 4lbs front
13t front sproket
CT racing full exhaust with 7 disc set up
K&N filter no lid , no snork
165 main jet , 33.5 pilot , 3turns out on air screw , needle in lean position
0 mph wind , temp was 102 degrees
tested with 97 Chevy 1500 on a dirt road 6/21/2003

 

whats the big deal about top speed, the only time you will go that fast for any length of time is in the open desert and if that is where most of your riding is then the Z is the wrong choice, just remeber its not the fastest rider that wins the race



just a thought

 

Twisted racer, are you talking about the gearing chart calculator. Let me tell you I tried it and it was dead on.

My R was doing 77.5 mph @9500 with 18 inch tires in the rear and 14/39 gearing to the chart. I some did a top speed runs using a gps and I was at 77.4, very close.

The next week I change the rear tire to Razr 18 inch. I measured them, they were actually 17 inches tall. I decided to change the gearing to 15/36. According the chart (gearing calculator) if I was able to pull the engine up to the rev limiter (9500 rpm) with the new higher gearing I should be able to do 85 mph.

Sure enough I took the R out and borrowed my friends gps and it ran 84.7 with little loss at the bottom end.

Motoracer, where I ride all we do is go wide open, there are times we have ridden over 75 mph for hours at a time. I would prefer mx or dunes but you have to ride what you have.

 

I had mine clocked at 66 mph on a paved road
I weigh 210
Z is totally stock

Clocked by a Harley, but the speedo is fairly accurate.

Hope this helps

 

160 lb rider/stock tire size/no mods/paved road/garmin gps/ 70.5mph

 

This is what you need to find the top speed. IF you can pull the RPM it will be right on the money.

http://home.earthlink.net/~gellett/ltz400.htm