1100 slingshot Jumpy rev counter

[Rochy111]

Hi again everyone, my 11’s Rev counter is jumpy, has anyone come across this before and is it an easy fix?

cheers

 

[wraith]

Is this when you're riding the bike or at a standstill?

[Dezza]

Check the wiring connections to the tach. There's a connection on the yellow / black from one of the coils mid loom and also obviously the block that feeds the clocks. Check the earth too for the clocks.

[Rochy111]

Thanks Wraith, it’s when I’m riding it. Thanks Dezza I’ll double check them again, I’ve had the coils off so I might have missed a bad wire

[Gixer1460]

On 9/7/2020 at 9:20 AM, Dezza said:

Check the wiring connections to the tach. There's a connection on the yellow / black from one of the coils mid loom and also obviously the block that feeds the clocks. Check the earth too for the clocks.

I thought the tacho signal came from the CDI module?

[Rochy111]

Thanks , Just had a quick look at the wiring diagram and it says that it’s feed is from the igniter unit, where does that get its signal from for the revs

Edited September 27, 2020 by Rochy111
Update

[vizman]

If you have a wiring diagram then it’s pretty self explanatory..... rh crank signal to the cdi, cdi to the tach. The tach generally has three terminals one is a switched live, one is a signal from the cdi and the other is an earth. Any of theses feeds/earth might be at fault, dodgy connector, damaged wire, bad earth etc...

 

sometimes aftermarket rev counters take their feed from the + coil terminal 

[Dezza]

The Y/B wire goes from the CDI to one coil and has a T in it to feed the signal to the tacho. At least it does on both my air and oil cooled bikes.

[dupersunc]

The 3 pin connector on the back of the rev counter is susceptible to corrosion . That would be the first thing to check.

[wraith]

As it's only when you're riding it, I'd say it's nothing complicated than a worn old taco, my kat one has been doing it for years, reads fine till I go over a bump then it jumps about then settles down.

But on the UK roads that's not for long, as the UK could not lay a smooth good road it there life depended on it  are road mender's think you put some tarmac on a road hit it with a spad one and that's a good job hit it twice that's a great job  rant over, I will now get my coat 

[Gixer1460]

10 hours ago, Dezza said:

The Y/B wire goes from the CDI to one coil and has a T in it to feed the signal to the tacho. At least it does on both my air and oil cooled bikes.

Not sure how they work then as most Suzuki tacho's need two pulses to 'count' correctly ie. both coils, hence why the ignition module is used.

[Dezza]

11 hours ago, Gixer1460 said:

Not sure how they work then as most Suzuki tacho's need two pulses to 'count' correctly ie. both coils, hence why the ignition module is used.

From efe manual, OEM SUzuki. Oil cooled machines are wired the same.

[vizman]

I don’t think oilboilers are wired the same.

[dupersunc]

All oil boilers have a dedicated black and red wire to send a signal from the CDI to the Tacho.

It doesn't go near the coils.

[Gixer1460]

2 hours ago, vizman said:

I don’t think oilboilers are wired the same.

No 'think' about it - they aren't!

[wraith]

This one is getting fun 

[Dezza]

Slabsides are wired the same as in the diagram, and they have oil cooled engines Unfortuntely, the OEM manual doesn't have a simplified ignition circuit diagram as does the efe manual.

I do accept that other oil cooled bikes may use different clocks/wiring. However, I do use one from a 600 teapot as a 'test' unit, so as far as I know that works the same as efe, slabby

 

Get your magnifying glasses out: the B/Y feeds the tacho from a T to one of the coils as does the efe.

Edited September 28, 2020 by Dezza
Pedantry

[Gixer1460]

2 hours ago, wraith said:

This one is getting fun 

she's definately got a stutter LOL!

[dupersunc]

1 hour ago, Dezza said:

Slabsides are wired the same as in the diagram, and they have oil cooled engines Unfortuntely, the OEM manual doesn't have a simplified ignition circuit diagram as does the efe manual.

I do accept that other oil cooled bikes may use different clocks/wiring. However, I do use one from a 600 teapot as a 'test' unit, so as far as I know that works the same as efe, slabby

 

Get your magnifying glasses out: the B/Y feeds the tacho from a T to one of the coils as does the efe.

Fair enough. 

All the slingshots and bandits have a separate feed though.

[wraith]

3 hours ago, Gixer1460 said:

she's definately got a stutter LOL!

I bet you would not say no to her 

[vizman]

None of mine or the dudettes or any slabby I’ve ever worked on was wired up like that as far as the tacho feed, they’ve all been fed like dunc said.

but that’s not to say some or even the vast majority aren’t.

Edited September 28, 2020 by vizman

[kiwisuzuki1100nz]

Just a thought but I had bot my tacho and speedo jump around when riding and found it was the mountng rubbers gone and the dial rubber mounting surrond.

Changed those and all fixed