- Posts: 7246
- Thank you received: 337
Sprocket change, gear ratio
- bountyhunter
- Offline
- User
Yeoww.... I put a 16/32 on my 750 twin and it turned 3600 @ 60. Ran good, but the twin is a lower RPM engine with wider torque curve. I ran that ratio for 25 years.My Primary reduction ratio = 2.55 (27/23 x 63/29).
5th Gear ratio = .88 (21/24)
Sprocket reduction ratio = 2.36 (33/14)
Therefore the Overall Drive Ratio = 5.30 ( 2.55 x .88 x 2.36 )
With a 140/90-16" rear tire the engine is running about 4,600 at a true 60 MPH.
1979 KZ-750 Twin
Please Log in or Create an account to join the conversation.
- Old Man Rock
- Offline
- User
- Posts: 6224
- Thank you received: 225
As depicted in the gear calc program and in comparing to riding mph & rpm, pretty much dead on...
NOTE: Acewell tach +/-200rpm, mph +/-2mph... Fairly accurate in any system...
Note 2: I also went 2 up on the rear sprocket...
Gear ration went from 2.33 to 2.46
5th gear, difference of 20... 70mph = 5000rpm
4th gear, difference of 15... 70mph = 5500rpm
@ 106 miles on the nose I hit reserve...
1978 KZ1000-A1 tank.... 4.4 gallon but not 100% sure.
~ 31 miles per gallon if calculating 1 gallon reserve...
Just the way it works!
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
Please Log in or Create an account to join the conversation.
- hocbj23
- Visitor
Please Log in or Create an account to join the conversation.
- PLUMMEN
- Offline
- User
- Posts: 8139
- Thank you received: 104
Still recovering,some days are better than others.
Please Log in or Create an account to join the conversation.
- hocbj23
- Visitor
Please Log in or Create an account to join the conversation.
- larrycavan
- Visitor
on mine I am turning just over 2900@60 and about 4000@75 And 5000@94
What's your sprocket setup?
This is my gearing on my 1200. I short shift this bike at 2800RPM...get it right up into 5th gear and just roll on the throttle. No wait..not downshift....just pulls clean and crisp with old VM 33 mikunis leaned out with O-6 needle jets and needles 1 clip from full lean.
And my port runners are NOT small I sized them for the fuel injection I have for the bike. The Mics are just there for now so I can ride it and have some fun :woohoo:
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
1.732/1.040/2.222 final ratio 4.002 Tire circumference 79.5"
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
otakar wrote:
on mine I am turning just over 2900@60 and about 4000@75 And 5000@94
What's your sprocket setup?
This is my gearing on my 1200. I short shift this bike at 2800RPM...get it right up into 5th gear and just roll on the throttle. No wait..not downshift....just pulls clean and crisp with old VM 33 mikunis leaned out with O-6 needle jets and needles 1 clip from full lean.
And my port runners are NOT small I sized them for the fuel injection I have for the bike. The Mics are just there for now so I can ride it and have some fun :woohoo:
The "J" engine has totally different gear ratios than the 73-79 motors.
1st=2.64
2nd=1.83
3rd=1.43
4th=1.17
5th=1.04
The primary is the same as yours
1.73
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.
- larrycavan
- Visitor
18/40-530. I will say that stop and Go traffic is a real pain with this setup.
1.732/1.040/2.222 final ratio 4.002 Tire circumference 79.5"
Here's the Gearcalc screenshot on that. I used 77" for rear tire circumferance...might be off a tad
I wish I did a J trans conversion in mine. It will pull that taller gearing no problem. It would love it actually
Please Log in or Create an account to join the conversation.
- larrycavan
- Visitor
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.
- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
Please Log in or Create an account to join the conversation.