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Wheels and sprockets 04 Jul 2021 17:24 #851289

  • DOHC
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This one's more reasonable. but it can't work.

 


No, it doesn't seem like it would help much, especially once a crack has started. I was just curious what it looked like.
'78 Z1-R in blue, '78 Z1-R in black, '78 Z1-R in pieces
'95 GPZ1100 (sold) , '00 ZRX1100
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Wheels and sprockets 05 Jul 2021 18:32 #851341

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I'm going to order the 33. If too tall I can go with a 14 tooth countershaft sprocket or use the 16 I have. 
Steve

JT Steel Rear Sprocket 630 33T #JTR501.33 Kawasaki
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Z1b1000 1975 Z1b
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Wheels and sprockets 05 Jul 2021 19:01 #851343

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Steve, my rear rim is a 16 x 3.00. I’m running a 130/90-16
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
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Wheels and sprockets 05 Jul 2021 19:19 #851345

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I will be too. What countershaft sprocket are you running?
Steve
Z1b1000 1975 Z1b
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Wheels and sprockets 05 Jul 2021 20:21 #851350

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15T counter. 32T driven. 
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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Wheels and sprockets 05 Jul 2021 20:28 #851354

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What's the RPM at 70 MPH?
Steve
Z1b1000 1975 Z1b
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Wheels and sprockets 05 Jul 2021 20:31 #851356

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I’ll test tomorrow. If I recall correctly I’m about 3200 at 55
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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Wheels and sprockets 06 Jul 2021 17:59 #851421

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It has rained all afternoon here and the humidity is so thick I could swim faster than walk. I’ll get you the 70 test run as soon as I can
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
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Wheels and sprockets 06 Jul 2021 18:21 #851425

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With the 15/35 I'm at just below 5000 RPM. With the 16/35 I'm just above 4500. Interesting to see how they compare. The pic of a MKII with a 16 there's more room between the fender and tire. I'd like to go back to my progressive shocks while I have the RFY shocks rebuilt. 
Steve
Z1b1000 1975 Z1b
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Wheels and sprockets 06 Jul 2021 19:25 #851429

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I can check my LTD tomorrow Steve.  Offhand I don't recall what sprockets are on it.

For my Z1's I'm running 16/35 and I do about 105 kph (Say about 65 mph) at 4,000 rpm, measured with a gps.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.
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Wheels and sprockets 06 Jul 2021 21:42 #851436

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My 1978 1000 LTD has a 16” rear mag and stock is a 33T rear.


The FSM for the 78 LTD shows 15/33, which is the same as the '78 kZ1000A and Z1R. The earlier Z1/900 and later '80 MKII used 15/35. It seems like they were playing with ratios over the years, but Kawasaki didn't necessarily use different ratios for 18" vs. 16" rear wheels.

The tires are slightly different in diameter. The 16" used an MT90-16, which seems to translate to a 130/90-16. The 18" used a 4.0-18. Comparing tires, the Bridgestone BT46 currently comes in both a 4.00-18 and 130/90-16. The 130/90-16 is about 1.5" small in diameter (25.079 vs 26.496). So the RPM at 70 would be a bit higher with the 130/90-16

Noodling around with a spreadsheet, this is what I came up with for RPM @ 70 MPH in 5th gear with those two Bridgestone tires, for different sprockets.  It seems to sort of compare with the engine speed numbers people have mentioned, so the math might be right.


 
'78 Z1-R in blue, '78 Z1-R in black, '78 Z1-R in pieces
'95 GPZ1100 (sold) , '00 ZRX1100
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Wheels and sprockets 07 Jul 2021 13:30 #851454

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It's raining off and on here today so I didn't get out.  We need all the rain we can get....over 200 forest fires going today.  The town of Lytton has been completely wiped off the map.  Unfortunately the forecast is for thunderstorms, which means a lot of lightning.

Sprockets are 16/33.
I have a couple of Z1B's restored, an '80 KZ1000LTD restored, a 1981 KZ550 restored and a 2008 KLR 650 for off road fun. My wife has a 2019 Suzuki DR 650 for on and off road.

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