Author Topic: Lazy tach  (Read 685 times)

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Offline johnyvilla

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Lazy tach
« on: July 26, 2009, 09:44:42 PM »
My tach has the benefit of a new cable but still jumps around a bit and does not register below 1100 rpm. What steps do I need to take remidy this problem?

Offline CB500_k2

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Re: Lazy tach
« Reply #1 on: July 27, 2009, 04:09:51 AM »
Had the same problem.  I had to take the instrument apart and apply a bit of lubrication to the moving parts.  You can use a Dremel cutoff disk to cut the chrome ring around and then open up the tach.  A spot of JB weld will hold the ring back together.
Too many bikes -- too little time
1973 CB500
1974 CB350 - sold
1975 CB400F SuperSport
2000 Ducati Monster Dark

Offline johnyvilla

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Re: Lazy tach
« Reply #2 on: July 27, 2009, 05:13:55 AM »
Isn't there a was of doing it without cutting the tach ring?

Offline CB500_k2

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Re: Lazy tach
« Reply #3 on: July 27, 2009, 07:04:22 AM »
Some people carefully pry the ring open but I have found that the thin cutting disk on the Dremel does a nice surgical cut on the ring and the JB Weld makes a reliable closure.  you can put the cut on the lower part of the ring so no one can see it.  A large (3in diameter) hose clamp makes an excellent clamp for reassembly.  I have repaired several tachs and speedometers without failure.
Too many bikes -- too little time
1973 CB500
1974 CB350 - sold
1975 CB400F SuperSport
2000 Ducati Monster Dark