[ChopperCharles]

So, I have a box full of Kawasaki parts, and apparantly I put the wrong speedometer drive gear on my 91 EX500, because at 70mph it reads 90mph. I need to find the correct one. Does anyone have a picture, or any way to determine which is which?

This is for a 1st gen, with the 16" front wheel.
Thanks!

Charles.

 

[MrSciTrek]

I don't have any such info... but if it's reading 20 mph fast at 70 mph, could you just look through your parts for a gear that has 9/7ths more teeth? (I'm not confident in how the speedometer gearing works)

 

[fog]

Check the ratio on the one you have, and find one about 20% slower.

FOG

 

[ChopperCharles]

Easier said than done without some way to spin a wheel at a constant velocity.

Charles.

 

[fog]

No Man , your making a big thing out of nothing. In your hand: Turn one end a full revolution and observe the other end revolution. Turn the slower end and count the turns it takes to revolve the slow end 1 turn. On the bike
Remove the speedo cable so you can see to inner part turn. turn the wheel and count the turns required to turn the cable 1 turn or the number of turns the cable makes from one turn of the wheel.

Like 3.2 to 1= .3215

and 3.9 to 1= .256

I don't mean those number to be correct nor is 20% the right amount but you (should ) get the Idea.

a 17" wheel is actually about 8.6% larger than the 16" wheel so count accurately.

It just occurred to me that since the drive is on the opposite sides of the wheel the "Hand should be reversed. With the connection for the cable on the bottom facing the rear the 16" drive flange should be on the right side (while sitting on the bike) the left for the 17" drive.


FOG

 

[MrSciTrek]

Heck, having never seen the little mechanisms...
I was hoping that you could just count the teeth on the drive he had installed that read 20 mph fast, and just pick another one from his parts box with about 1/5 (2/9) more teeth.

Doesn't work that way, huh? Shoot.

 

[fog]

no visable teeth.

FOG

 

[ChopperCharles]

The speedo drive gear is on the left hand side (as sitting on the bike) on the early models too.

It may be that I have a late-model EX500 or an early ZX600 speedo drive.

Kwacker speedos are 2240rpm = 60mph ratio, right?

Charles.