rpm speed cross reference
 

here is a list of values that may be usefgul :

gear rpm mph kph

4 4500 35 55
5000 40 65
5500 43 70
6000 47 75
6500 51 83
7000 55 90
7500 59 97
8000 63 101

5 5000 49 80
5500 54 85
6000 58 95
6500 63 101
7000 68 115
7500 73 120
8000 78 125

What tach are you running?

Hey thanks, I didn't know the GZ could go that fast in 4th without redlining, mine sounds angry if I get near 40 in 4th.

I rode mine for a couple of hours once at 60-65 mph in fourth gear. It was the only way I could get over fifty in the head wind. Lots of vibration but that was about it.

bigfour, the bike isn't angry, it is yelling for more throttle.

Hmmm... My mechanic mentioned that I should not exceed 100 kph (60-65 mph) if I want my bike to last... After all it's an air cooled engine...

Heh.

Nah youll be fine.
I do 60-63Mph in 4th all the time.

Its fine.

rpm speed cross reference
 

The figures quoted are calculated using the final drive ratio and gear ratio. I used a calulator that I found on the web. The values relect values that I have acheived on my speedo and have calculated using wheel circumference and rpm @ specified engine rpm.

Re: the 16 tooth mod . Here are some calculated values.

5 th gear
49 mph 4750 rpm
54 mph 5250
59 mph 5750

here are to same speed with 15 tooth sprocket

5 th gear
46 mph 4750 rpm
53 mph 5500 rpm
60 mph 6250

there seems to be a definite drop in engine speed in the 50 - 60 mph range which is the cruising speed for this machine.

Is this a good thing or a bad thing :P

Higher Gearing
 

My bike seems to run better & stronger with the 16 tooth gear. My concern would be the clutch if anything. I wonder if Barnett or anyone else makes a heavy duty spring & clutch plate kit for it?
:??: