When I’m crusing I don’t need to go down to 3th gear to find power when passing, just usr the throtle… so I was wondering if I go smaller rear I can have less RPM and then gear down to 3th when alot more power is needed.
its 750gpz with big bore 810cc high compresson. The carb is orginal 650 carbs…
1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).
It depends on the size of the engineand the transmission. With standard gearing my Z1 will run around 4,000 rpm at 100 kph. My wife's KZ550 used to run around 5,000 rpm at 100 kph, but that bike had six gears. A small engine like a 250cc might run close to redline.
I have several restored bikes along with a 2006 Goldwing with a sidecar. My wife has a 2019 Suzuki DR 650 for on and off road.
I made so much more power than stock with my 831cc bike that I had to change the gearing. Your probably about 10 HP down from what I have, I had to change gearing because I could not shift out of first fast enough.
I run a 17T front and a 38T rear, at 90KPH it revs at 4,000.
If you have enough HP it will pull strong in any gear.