digital tachometer

[squonk 41,155]

Reading the instructions for this tach, it has a setting for firing every other rev so it will work on a Kohler single.

 

https://www.aliexpress.com/item/1005002033206119.html?spm=a2g0o.productlist.0.0.63c939a8YLfHob&algo_pvid=676ca6e9-219e-4861-8335-8f4638758518&algo_expid=676ca6e9-219e-4861-8335-8f4638758518-4&btsid=0bb0623b16213737382306251e1791&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

[Tractorhead 9,064]

1 hour ago, squonk said:

Reading the instructions for this tach, it has a setting for firing every other rev so it will work on a Kohler single.

 

https://www.aliexpress.com/item/1005002033206119.html?spm=a2g0o.productlist.0.0.63c939a8YLfHob&algo_pvid=676ca6e9-219e-4861-8335-8f4638758518&algo_expid=676ca6e9-219e-4861-8335-8f4638758518-4&btsid=0bb0623b16213737382306251e1791&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

 

Hey Mike the solution is as simple as it sounds,

you just have to look for a Tacho, that is configurable for a 2 Stroke singlecylindre Engine because they fire every rev

That‘s the 2 stroke rules.

👍

 

 

[squonk 41,155]

3 minutes ago, Tractorhead said:

 

Hey Mike the solution is as simple as it sounds,

you just have to look for a Tacho, that is configurable for a 2 Stroke singlecylindre Engine because they fire every rev

That‘s the 2 stroke rules.

👍

 

 

I need one that fired every other rev.

[Tractorhead 9,064]

1 minute ago, squonk said:

I need one that fired every other rev.

PM sent

[Gregor 4,846]

Tomorrow I am going to hook this up to one of my tractors, and compare it to a digital hand held.

If it's not still raining.

Edited May 18, 2021 by Gregor

[R Scheer 502]

The "Tiny Tach" works fine with my Kohler Magnum 12.  Shows the corrdct RPM.

[Tractorhead 9,064]

7 hours ago, Gregor said:

 

If it's not still raining.

 

Oh. Common mow the Waterline...

but don‘t forget the evidence pic.. 😂😂😂😂

 

 

 

[Gregor 4,846]

I have the 876 up to the garage. I think a neighbor might want to kill me.

[ebinmaine 67,624]

47 minutes ago, Gregor said:

. I think a neighbor might want to kill me.

Why?

Can't take the sound?

 

[Gregor 4,846]

8 minutes ago, ebinmaine said:

Why?

Can't take the sound?

 

I had to move 3 tractors out to get to this one. I wanted a Kohler with battery ignition.

[ebinmaine 67,624]

If I had neighbors that were upset when I moved a tractor I'd park a dozen running in the driveway. 

But I'm a stinker. 

 

 

 

 

 

 

✔️. Does not play well with others. 

[Gregor 4,846]

Kohler 8 HP with battery ignition

The 2 tachs.

1P1r 4 wraps

 

1P2r  4 wraps

Digital hand held Not easy to see 1578

 

I tried both 4 and 5 wraps around plug wire. didn't seem to make much difference.

 

[Gregor 4,846]

11 minutes ago, ebinmaine said:

If I had neighbors that were upset when I moved a tractor I'd park a dozen running in the driveway.

They don't usually mind, except maybe at 2:45 AM

[Gregor 4,846]

And since I have another tach, may as well check that one out. This one is both a contact, and a laser. I think the contact type is the easiest to use. No guessing on the # of wraps. No applying reflective tape, and then trying to hold your laser steady on that tape. Hold the tach on the end of the shaft, your done.

After taking all these readings, I adjusted my idle back down to 1300 RPM. Not sure what it should be.

Edited May 19, 2021 by Gregor

[ebinmaine 67,624]

2 minutes ago, Gregor said:

adjusted my idle back down to 1300 RPM. Not sure what it should be.

Should be 1200 RPM. 

 

That said, my c-160 doesn't like to run right below 1250 or 1300 for some reason and that's with two different carburetors on it. So I leave the idle about 1300, 1350.

 

To be honest I don't know that it matters all that much because these air-cooled engines should NEVER be at idle unless they're about to be shut off. 

[MikMacMike 479]

17 hours ago, ebinmaine said:

 

It's because for the most part you don't actually need one.

 

Most if not all wheel horses say by the book that with a hydro you should ALWAYS be at 3600 RPM.

You need to keep it at full RPM for the best cooling and fluid flow characteristics.

 

For the most part a manual transmission is the same.

The only exception I'm aware of is a sickle mower but I'm certainly open to correction from much more experienced people. 

 

 

Disclaimers.

Is that how I run my manual transmission tractors? No.

Do we pay close attention to make sure they're not overheating? Yes.

 

Do I think tachometers and other gauges look super cool? Yes. The more the better. But I certainly understand the keep it simple theory. 

Having a hand held is excellent for tune up time, I guess if I was to install a very small one on a tractor is when you add non WH impliments, I just baught a chipper/shredder and I noticed that the suggested rpm was about 2000.

[ebinmaine 67,624]

6 minutes ago, MikMacMike said:

I just baught a chipper/shredder and I noticed that the suggested rpm was about 2000

 

Double check where that stated RPM is. Some of them have direct drive, deer drive, reduction by belt pulley sizes, etc.

 

My Mckissick chipper is one that mounts to the front of a tractor.

I read somewhere that it wants an RPM around 2,800.

Cinnamon horse c-160 is set to a top side of 3,300.

Chipper pulley is bigger than the engine pulley so it should be just about right. 

[Tractorhead 9,064]

I don’t know if the Kohlers have a auto decompression, that can be the cause of the needed higher idle.

 

 

[BOB ELLISON 2,981]

Yes I did a post on this i just had to find it.

The tachometer is still working fine.

 

 

[Gregor 4,846]

51 minutes ago, Tractorhead said:

I don’t know if the Kohlers have a auto decompression, that can be the cause of the needed higher idle.

 

 

[ebinmaine 67,624]

5 hours ago, BOB ELLISON said:

Yes I did a post on this

Thanks for sharing that Bob

[seuadr 488]

On 5/19/2021 at 5:03 AM, Gregor said:

Kohler 8 HP with battery ignition

The 2 tachs.

 

 

 

 

I tried both 4 and 5 wraps around plug wire. didn't seem to make much difference.

 

thanks for sharing your results -  i was just looking at that unit because i also need an hour meter and well, 2 for 1, right?!

[Gregor 4,846]

The only bad thing about this unit is, you cannot shut it off. There is no switch. I always remove the battery. It does not seem to lose it's data though. It keeps the total hours.

[Charbs152 254]

On 5/18/2021 at 7:26 AM, Gregor said:

MMmmm   Are you sure?

The tiny tachs i've used have settings for different firing orders for different engine designs

[seuadr 488]

4 minutes ago, Gregor said:

The only bad thing about this unit is, you cannot shut it off. There is no switch. I always remove the battery. It does not seem to lose it's data though. It keeps the total hours.

oh. the description suggested that it turns on when it senses spark