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wired tach to tractor motor

#1

J

JAYJAY

hi there

Does anymore had wired a tach to a lawnmower tractor?
I bought one from a ski doo and it only have 2 wire for the signal and 2 wire for the light.
here's a picture.
IF someone can help me
thank you

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#2

dfbroxy

dfbroxy

I do not know the answer but would like to. Im posting on this thread to keep it on the new threads list. This is the list that most of the answer guys check. Does your mower already have a old tach on it? If so it should be only adapting the wiring to new tach. If it doesnt then it might need some parts to go on the motor. Please post your tractor make and model for the experts to give you an informed answer.


#3

BlazNT

BlazNT

JAYJAY said:
hi there

Does anymore had wired a tach to a lawnmower tractor?
I bought one from a ski doo and it only have 2 wire for the signal and 2 wire for the light.
here's a picture.
IF someone can help me
thank you
Click to expand...

That type of tach is for motorcycle type engines and is not compatible with a lawnmower engine. I suggest using a Tinytach or such.


#4

P

Pumper54

JAYJAY said:
hi there

Does anymore had wired a tach to a lawnmower tractor?
I bought one from a ski doo and it only have 2 wire for the signal and 2 wire for the light.
here's a picture.
IF someone can help me
thank you
Click to expand...

Lot of folks wire a small tach to their mowers and they use the kind that has the induction wire that wraps around a plug wire. Your picture is not really clear on make and model of tach and also we would need to know just what mower you want to add it to as many mowers are wired differently. More information get better answers faster. Good luck with this.
Tom


#5

J

JAYJAY

dfbroxy said:
I do not know the answer but would like to. Im posting on this thread to keep it on the new threads list. This is the list that most of the answer guys check. Does your mower already have a old tach on it? If so it should be only adapting the wiring to new tach. If it doesnt then it might need some parts to go on the motor. Please post your tractor make and model for the experts to give you an informed answer.
Click to expand...

I finally find how the green goes on the killswith and the yellow on the light wire that comes from the flywheel. But it read 6000 rpm so I don't know why


#6

J

JAYJAY

BlazNT said:
That type of tach is for motorcycle type engines and is not compatible with a lawnmower engine. I suggest using a Tinytach or such.
Click to expand...

It comes from a skidoo it work but reading 6000 rpm instead of 3000


#7

J

JAYJAY

Pumper54 said:
Lot of folks wire a small tach to their mowers and they use the kind that has the induction wire that wraps around a plug wire. Your picture is not really clear on make and model of tach and also we would need to know just what mower you want to add it to as many mowers are wired differently. More information get better answers faster. Good luck with this.
Tom
Click to expand...

The tach comes from a ski doo the motor that I have is a tecumseh 17.5h hp 1 cylinder. It work but read 6000 rpm


#8

B

bertsmobile1

That means nothing .
The Tecumseh could have used battery ignition or magneto ignition.
If it used battery then the tach will not work with your magneto engine.

Next step is to get a copy of the ski-do wiring diagram because the tach will wire up the same regardless of what it is fitted to.


#9

J

JAYJAY

bertsmobile1 said:
That means nothing .
The Tecumseh could have used battery ignition or magneto ignition.
If it used battery then the tach will not work with your magneto engine.

Next step is to get a copy of the ski-do wiring diagram because the tach will wire up the same regardless of what it is fitted to.
Click to expand...

I do have the wiring diagram from the ski doo.
So is there something that I can do to make it work correctly


#10

B

bertsmobile1

Post the diagram so we can have a look at it


#11

J

JAYJAY

bertsmobile1 said:
Post the diagram so we can have a look at it
Click to expand...


View attachment 1989_WD.pdf
another thing its 2 stroke to 4 stroke dont know if it makes a different
i think i need to put a resistor somewhere


#12

P

Pumper54

I am not an expert on vehicle electronics but the way I understand it is that if you use a tach made for multi cylinder engines on a single it will read double the RPM hence your reading of 6000 RPM when you are looking for 3000 RPM.
As a side note the PDF link you posted is to car electrical diagrams and not a SeaDoo.
Tom


#13

J

JAYJAY

Pumper54 said:
I am not an expert on vehicle electronics but the way I understand it is that if you use a tach made for multi cylinder engines on a single it will read double the RPM hence your reading of 6000 RPM when you are looking for 3000 RPM.
As a side note the PDF link you posted is to car electrical diagrams and not a SeaDoo.
Tom
Click to expand...

thats what im thinking is 2 cylinder
the pdf i post its for safari ski doo wiring diagram. the tach come from a safari


#14

P

Pumper54

"the pdf i post its for safari ski doo wiring diagram. the tach come from a safari "
Oh my bad I thought that was for cars. Like I said before I know nothing about Ski doos or other powered watercraft. Hope you get it figured out
Tom


#15

H

Hitechluddite

My guess is that the Skidoo was a twin cylinder and computed Rev on the firing stroke, since you have a single cylinder every stroke is a firing stroke...


#16

Compact7

Compact7

Make a new scale.


#17

PTmowerMech

PTmowerMech

JAYJAY said:
hi there

Does anymore had wired a tach to a lawnmower tractor?
I bought one from a ski doo and it only have 2 wire for the signal and 2 wire for the light.
here's a picture.
IF someone can help me
thank you
Click to expand...

Did you try hollering at it?


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