Welcome, Guest
Username: Password: Remember me
  • Page:
  • 1
  • 2

TOPIC:

KZ440 Speed / RPM / Gearing 03 Aug 2021 21:00 #853122

  • TexasKZ
  • TexasKZ's Avatar
  • Offline
  • Platinum Member
  • Posts: 7166
  • Thank you received: 2043

I know I can use a phone to measure GPS speed.  What other way could I measure RPM?
With a calibrated tachometer. In the olden days, mechanics routinely used a device called a tach / dwell meter when tuning up cars with points ignition. The one I have is getting close to 50 years old. I have no idea if anybody still sells one, but if you can buy, borrow or rent a decent one, you can use it to compare the bikes tachometer readings.
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

Please Log in or Create an account to join the conversation.

KZ440 Speed / RPM / Gearing 03 Aug 2021 21:02 #853123

  • TexasKZ
  • TexasKZ's Avatar
  • Offline
  • Platinum Member
  • Posts: 7166
  • Thank you received: 2043
Well, they do indeed exist. A two second search netted a ton of them.

www.amazon.com/dwell-tach-meter/s?k=dwell+tach+meter
1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

Please Log in or Create an account to join the conversation.

KZ440 Speed / RPM / Gearing 04 Aug 2021 03:18 #853129

  • 650ed
  • 650ed's Avatar
  • Offline
  • User
  • Posts: 15344
  • Thank you received: 2828

Maybe your bike's clutch is slipping.  Ed

 
What makes you say that?
 
I've seen where folks have bikes that run at high rpm and they eventually find that the clutch was slipping.  When that happens it is not unusual for the rpm to exceed normal speeds to keep the bike moving along at a given pace.  Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

Please Log in or Create an account to join the conversation.

KZ440 Speed / RPM / Gearing 04 Aug 2021 07:21 #853135

  • KZB2 650
  • KZB2 650's Avatar
  • Offline
  • User
  • Posts: 1475
  • Thank you received: 265
From what I've read I'd try a 16 tooth front. Read it lowers things by 400 R's at 60. Would be cheap and you could still go with a 42 rear if you needed too. Would give you a idea what it might do for around town power and fun before you spent too much also.
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket.

Please Log in or Create an account to join the conversation.

KZ440 Speed / RPM / Gearing 06 Aug 2021 18:02 #853301

  • SteveKing84
  • SteveKing84's Avatar Topic Author
  • Offline
  • User
  • Posts: 70
  • Thank you received: 12

Maybe your bike's clutch is slipping.  Ed


 
What makes you say that?
A slipping clutch could account for the higher than expected rpm at highway speeds.
 
How can I check for this.  This certainly is not something I want happening!

Please Log in or Create an account to join the conversation.

KZ440 Speed / RPM / Gearing 06 Aug 2021 20:22 #853312

  • SteveKing84
  • SteveKing84's Avatar Topic Author
  • Offline
  • User
  • Posts: 70
  • Thank you received: 12
Is it my fault because I like to adjust my clutch engagement closer to the grip than not?

Please Log in or Create an account to join the conversation.

  • Page:
  • 1
  • 2
Powered by Kunena Forum