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76 KZ750 B1 Twin 05 Dec 2015 10:18 #702028

  • Bowman
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Thanks for the link Pete. I'll bookmark those guys. I was just using Partzilla to confirm that my pistons will work with my rotors.

I found these guys stores.ebay.co.uk/Powerhouse-Automotive-Ltd and got a seal kit from them and it looks pretty good quality, new crush washers, new bleed nipples, grease etc. Not cheap but I'm funny that way, saving money on brakes is not one of my priorities.
Honda 55 Trail don't ask me what year, 65? (sold)
79 Yamaha XS400 (sold)
76 KZ750B Twin (project)
72 Honda CT70 (project)

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76 KZ750 B1 Twin 05 Dec 2015 13:30 #702043

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I have late style rotors on mine now. They are thinner than the early solid style. The pistons have to come out further but it hasn't been a problem.
Steve

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76 KZ750 B1 Twin 05 Dec 2015 14:31 #702047

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Beginning to make sense to me now. When they drilled the rotors they should shed heat better. Then they could make them a bit thinner to save some weight and make the pads a bit bigger to improve stopping power. Win-win. Meanwhile the piston travel is more than capable of dealing with the ~1-2 mm thinner rotors.
Honda 55 Trail don't ask me what year, 65? (sold)
79 Yamaha XS400 (sold)
76 KZ750B Twin (project)
72 Honda CT70 (project)

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76 KZ750 B1 Twin 05 Dec 2015 14:36 #702049

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The thin ones are about 1/2 the weight.
Steve
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kzrider.com/forum/13-bike-related/598515...s-of-all-time#676064





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76 KZ750 B1 Twin 05 Dec 2015 15:07 #702051

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Your right of course. I just checked and my old single disk has 6mm stamped on it for min thickness and the duals are 4.5mm. So x times y times z times pi, yeah were about half the weight. So you get more than twice the contact between the pads and the rotors at the expense of the weight of one caliper and one length of brake line. I'll take it.
Honda 55 Trail don't ask me what year, 65? (sold)
79 Yamaha XS400 (sold)
76 KZ750B Twin (project)
72 Honda CT70 (project)

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Last edit: by Bowman.

76 KZ750 B1 Twin 05 Dec 2015 15:17 #702053

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Unsprung weight is the pay off. Easier on the front end and the ride is better.
Steve

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76 KZ750 B1 Twin 05 Dec 2015 20:44 #702082

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Kawasaki like all of the other manufacturers, started to drill their brake rotors in the 70's to improve brakeing in the rain. The solid rotors take many revolutions to develop normal performance when used in the rain. The holes in the rotors give the water a place to go and take just one or two revolutions to develop normal performance.
1980B4 1000
1978 Z1R
1978 B3 750

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76 KZ750 B1 Twin 06 Dec 2015 08:10 #702121

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80B4 wrote: Kawasaki like all of the other manufacturers, started to drill their brake rotors in the 70's to improve brakeing in the rain. The solid rotors take many revolutions to develop normal performance when used in the rain. The holes in the rotors give the water a place to go and take just one or two revolutions to develop normal performance.


The more holes also help keep the brake pads & the rotor's cooler under hot & heavy braking
I swapped my stock rotors on my 80 LTD 1000 with a pair of 78 Z1R rotors & noticed the difference


Pete
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!
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76 KZ750 B1 Twin 06 Dec 2015 10:47 #702145

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Definitely better that those clunky stock rotors.
Steve

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76 KZ750 B1 Twin 06 Dec 2015 11:11 #702151

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swest wrote: Definitely better that those clunky stock rotors.
Steve

:) B)
1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!

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76 KZ750 B1 Twin 06 Dec 2015 11:11 #702152

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It's been unreasonably warm for this time of year in Ottawa so I bit the bullet and swapped my forks around to put the calipers on the rear. Happy now swest? ;) I do admit they look better back there. Also put on my mini turn signals while I was at it.


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Honda 55 Trail don't ask me what year, 65? (sold)
79 Yamaha XS400 (sold)
76 KZ750B Twin (project)
72 Honda CT70 (project)
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76 KZ750 B1 Twin 06 Dec 2015 12:12 #702165

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Nice work! I will be using the cast front wheel from a KZ1000 Ltd and the cast wheel from a KZ1000P on my 750 twin. I will eventually build a set of spoke wheels like yours.
1980B4 1000
1978 Z1R
1978 B3 750
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