2:1 tach vs 1:1..does it matter?

  • DaddyJama
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2:1 tach vs 1:1..does it matter?

25 Jan 2012 00:47
#499951
i was looking around for a new tach and speedo combo.. i see that some are 2:1 and others are 1:1.. does it matter which i get to fit my ltd440?
2005 636 - track bike
1982 kz440ltd - new toy;)

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  • TexasKZ
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Re: 2:1 tach vs 1:1..does it matter?

25 Jan 2012 11:23 - 25 Jan 2012 11:25
#499987
That depends on what sort of trigger or pickup is involved and what it is connected to and whether you are talking about the speedo or the tach. What does the manufacturer say?

OK, I see the subject line says tach.
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1981 KZ1000 LTD awaiting resurrection
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Last edit: 25 Jan 2012 11:25 by TexasKZ.

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  • Jeff.Saunders
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Re: 2:1 tach vs 1:1..does it matter?

25 Jan 2012 13:41
#500008
They are referring to crank versus cam driven ignitions.

The crank turns twice for every revolution of the cams.

Some bikes have the ignitions on the end of the crank, others up in the cam.
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Re: 2:1 tach vs 1:1..does it matter?

27 Jan 2012 01:28
#500273
so mine runs off cam, so do i get a 2:1 or 1:1
2005 636 - track bike
1982 kz440ltd - new toy;)

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  • kzcafe750_24
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Re: 2:1 tach vs 1:1..does it matter?

27 Jan 2012 14:00
#500329
1:1 tach
1981 Kz 750-4 LTD - Wiseco 810 Big Bore,Ported cylinder head, GPZ 750 Cams,Dyna Ignition(DynaS,Green Coils,DRL400 2stage Revlimiter), RC 4 into 1 fitted with Yoshi muffler, ZR550 Swing arm, ZR550 Rear Rim, ZX750turbo front end SuperFlo Dyno Tuned- 68WHP&43WTq(ftlbs)
1986 Honda Rebel 250 (Stock)
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  • 750steve
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Re: 2:1 tach vs 1:1..does it matter?

27 Jan 2012 15:39
#500337
If it helps the tach output for my KZ750 B2 twin reads at 1:1 & its a modified KZ440 ignition
07 ZX6R Race Bike
1977 Z750 B2 Twin
1976 Z650 B1

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Re: 2:1 tach vs 1:1..does it matter?

28 Jan 2012 02:24
#500412
awesome! so 1:1 tach.. what about the speedo?

i'm looking at dime city and they sell alltyped of ratios?

750steve, how did you find out the 750 is a 1:1?
2005 636 - track bike
1982 kz440ltd - new toy;)

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Re: 2:1 tach vs 1:1..does it matter?

28 Jan 2012 12:48
#500440
DaddyJama wrote: awesome! so 1:1 tach.. what about the speedo?

i'm looking at dime city and they sell alltyped of ratios?

750steve, how did you find out the 750 is a 1:1?

It says in the fitting instructions, 1 pulse per crank revolution
07 ZX6R Race Bike
1977 Z750 B2 Twin
1976 Z650 B1

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  • notaduc
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Re: 2:1 tach vs 1:1..does it matter?

29 Jan 2012 01:13
#500565
If you are talking about the cam driven mechanical tach.

The cam rotates once per engine revolution, but the tach drive pinion is much smaller than the drive gear on the cam, so, Id have to say its not 1:1

Im pretty sure its 4:1. I have my head apart, I will check when I put my cam back in this week.
1980 (mostly) KZ1000
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Re: 2:1 tach vs 1:1..does it matter?

29 Jan 2012 12:26
#500610
thanks notac..

mine is a mechanical..
2005 636 - track bike
1982 kz440ltd - new toy;)

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Re: 2:1 tach vs 1:1..does it matter?

29 Jan 2012 13:06
#500635
I just saw you have a 440, thats a twin huh? Either way the cam rotates 1:1, but it depends on the gearing ratio between the cam/pinion. I have a 1000 four, which could very likely have a different ratio.

If you want to be 100% sure, you can disconnect the cable turn the engine over manually one full revolution and count how many times the cable turns.
1980 (mostly) KZ1000

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Re: 2:1 tach vs 1:1..does it matter?

02 Feb 2012 21:08
#501612
Havent installed my cam yet (waiting for bearings). But the picture in my head of the gear drive was wrong, looking at it it may be 1:1.

So, ultimately, Im no help so far.
1980 (mostly) KZ1000

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