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Z1 6 Speed Transmission Conversion 29 Sep 2020 05:25 #835833

  • nickacosta
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As winter slowly approaches I'm planning on a few upgrades to my Z1B engine (1075, oversized valves, porting, kz650 buckets, cams, etc) and I was wondering if anyone has converted their stock transmission on their Z1/KZ900/1000 to a six speed setup.
I know the stock gears in my transmission are only case hardened as far as I know, so undercutting those aren't the greatest idea for longevity

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Z1 6 Speed Transmission Conversion 29 Sep 2020 08:18 #835849

  • Mikaw
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I’m very interested in a six speed conversion. I’ll be following this.

Just FYI. I went back and looked at your post when you bought the bike. You might want to confirm what you have so the correct parts can be acquired. The only thing that looked correct for a Z1B is the carbs. You might not have an Actual 1975 Z1B.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.

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Z1 6 Speed Transmission Conversion 29 Sep 2020 10:03 #835859

  • nickacosta
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Only the frame, engine, and gas tank we're original on that bike, as well as the speedo and tach, everything else was a mixmatch of parts but since then the motorcycle has been restored

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Z1 6 Speed Transmission Conversion 29 Sep 2020 10:59 #835864

  • zed1015
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There's no six speed conversion i've heard of and i've been around these a very long time.
Nothing wrong with having the stock trans back cut though.
It will cope with a lot more power than you plan to put through it and will probably out last the rest of the bike.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Z1 6 Speed Transmission Conversion 29 Sep 2020 11:14 #835865

  • Mikaw
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nickacosta wrote: Only the frame, engine, and gas tank we're original on that bike, as well as the speedo and tach, everything else was a mixmatch of parts but since then the motorcycle has been restored


Just a personal opinion. If you have restored a Z1B then adding performance parts is likely to take away from the value. You should consider finding a cheap KZ to play with. Ultimately your money and choice.
1976 KZ 900 A4 kzrider.com/forum/11-projects/613548-1976-kz-900-a4
1976 KZ 900 B1 LTD
1978 KZ 1000 B2 LTD
1980 KZ 750 E1
Kowledge Speaks, But Wisdom Listens.
Jimi Hendrix.
The following user(s) said Thank You: Rick H.

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