speedo wrong?

thadley55
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speedo wrong?

01 Aug 2010 20:22 - 01 Aug 2010 20:23

According to the guide at Z1 I have the correct speedo for my year model and I'm pretty sure my front wheel is the right size but my speedo shows I am going faster than I am,ie. shows40 at about35, or shows 90 at 70. Any suggestions.BTW I have a 76 KZ900A4

1975 XL125 Honda first bike
1993? VTR 250 Honda gone
1983 LTD 440 Yammy gone
1988 CBR 600 Honda gladly gone!!
1976 KZ900 daily driver

Last edit: 01 Aug 2010 20:23 by thadley55.

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MFolks
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Re: speedo wrong?

01 Aug 2010 20:33

#387578

Did you change tire sizes? I'd think this would affect the speedo more than anything else.

1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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otakar
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Re: speedo wrong?

01 Aug 2010 21:10

#387584

With that much difference there is something els going on. Either you switched from the stock 19" front to an 18" or the spedo is the wrong one or the spedo drive is the wrong one. That is a 33% discrepancy.

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

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KZ250LTD
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Re: speedo wrong?

01 Aug 2010 21:25 - 01 Aug 2010 21:28

#387585

Mine is farther out than that even, these old speedo mechs loosen up/wear out/go out of spec. There is a guy around who'll rebuild them incl nice new faces etc for a price

Edit: if you don't feel like paying the $300-400 for a rebuild, you can just buy a bicycle speedo, or something similar. I have one on my Z1, only maybe $30. The only problem is that it only reads up to 75.

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Last edit: 01 Aug 2010 21:28 by KZ250LTD.

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JMKZHI
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Re: speedo wrong?

02 Aug 2010 08:29

#387639

If you discover that the problem is with the speedo, Z1Resto restores meters from the earlier KZs... 1970s models & maybe some 1980 models (but nothing after 1980). Z1Enterprises.com has a link & other info. The last time I checked the price was in the $100 range.

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dshelly
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Re: speedo wrong?

02 Aug 2010 08:35

#387640

Just got my speedo and tach back from Z resto. Mine used to jump up and down. Awesome job and he calibrates them . Cost me $95 for the speedo and $110 for the tach.(it needed a new crimp ring)

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'77 Kz1000B1
'78 Kz1000A2
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thadley55
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Re: speedo wrong?

03 Aug 2010 21:38

#388021

Thanks for the info guys,u would think that if something were worn out it would read slow not fast, also, is there different speedo drives for different models?

1975 XL125 Honda first bike
1993? VTR 250 Honda gone
1983 LTD 440 Yammy gone
1988 CBR 600 Honda gladly gone!!
1976 KZ900 daily driver

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otakar
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Re: speedo wrong?

04 Aug 2010 05:58

#388061

There are quite a few different gear ratios on the speedo drives.

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

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Motor Head
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Re: speedo wrong?

04 Aug 2010 06:22

#388063

If you feel everything is correct for the bike, but are unsure of the gear ratio for the speedo drive. Then changing this may get you much closer to being right. But you need to figure your ratio now, then a figure for the percentage your off, and then figure a correcting ratio. Then is that available, or something close, that fits your fork/ wheel.

1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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fordtruck
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Re: speedo wrong?

04 Aug 2010 08:35

#388084

dshelly those are beautiful! Someday I'll send mine out to be rebuilt.

'77 KZ1000-MTC 1075 kit. Stage 1 port

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thadley55
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Re: speedo wrong?

11 Aug 2010 17:43

#390186

Where do I find the info about the ratio and where can I get new gear?

1975 XL125 Honda first bike
1993? VTR 250 Honda gone
1983 LTD 440 Yammy gone
1988 CBR 600 Honda gladly gone!!
1976 KZ900 daily driver

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