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Old 07 January 2012, 17:15   #1
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Wiring aftermarket tacho to new DF25

Hi all

Have just bought an aftermarket tach (see 52mm White Face Rev Counter Tacho Tachometer Gauge ( Waterproof & UV Proof ) | eBay ) to connect to my newly acquired a new Suzuki DF25 (V-Twin). There are four terminals on the back of the tacho including one which says "Connect to RPM Signal".

I have the manual supplied with the engine but the wiring diagram gives no indication as to where such a signal can be picked up from.

Any ideas or should I contact a Suzuki dealer?

Cheers.
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Old 07 January 2012, 17:47   #2
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Cancel that request. Have now found the answer to my own question!
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Old 07 January 2012, 18:23   #3
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Old 08 January 2012, 04:40   #4
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So am I, thanks ;-)
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Old 08 January 2012, 15:31   #5
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Well, all connected and working, but readiing (at a guess) double the revs. Any ideas?
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Old 09 January 2012, 08:22   #6
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Somewhere on the back of the tacho will be a switch with (at a guess) 2-4-6. fiddle with that until it reads sensibly.

Background: the tacho counts the pulses of voltage that the alternator spits out in a second. Alternators come in different guises, with more or less poles in them. Net result of this is that for a given RPM an altrernator with, 4 poles will throw out 2/3 of the pulses that a 6 pole will. If your switch is set to 4 pole and you have a 6 pole alternator, the tacho will think the engine is going 50% faster than it actually is because it is seeing 6 pulses per rev when it is expecting to see 4. (& vice versa)
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Old 09 January 2012, 13:29   #7
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Quote:
Originally Posted by 9D280 View Post
Somewhere on the back of the tacho will be a switch with (at a guess) 2-4-6. fiddle with that until it reads sensibly.

Background: the tacho counts the pulses of voltage that the alternator spits out in a second. Alternators come in different guises, with more or less poles in them. Net result of this is that for a given RPM an altrernator with, 4 poles will throw out 2/3 of the pulses that a 6 pole will. If your switch is set to 4 pole and you have a 6 pole alternator, the tacho will think the engine is going 50% faster than it actually is because it is seeing 6 pulses per rev when it is expecting to see 4. (& vice versa)
There is indeed a switch on the back which, supposedly, sets it for 2, 3, 4, 5, 6 or 8 cyclinder engines. Mines a 2-cylinder but, having checked, the switch is currently set at 8-cylinder. Moving it to the 2-cylinder position shows a tick over rpm of over 6,000 !!!
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Old 09 January 2012, 13:35   #8
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Quote:
Originally Posted by NSS View Post
There is indeed a switch on the back which, supposedly, sets it for 2, 3, 4, 5, 6 or 8 cyclinder engines. Mines a 2-cylinder but, having checked, the switch is currently set at 8-cylinder. Moving it to the 2-cylinder position shows a tick over rpm of over 6,000 !!!

That scale isn't #cyls, its # alternator poles........

keep notching it up. It wll get sensible somewhere further up the scale (I did the maths and guess 6)
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