FS14 Wolf's build

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piperdown
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Re: FS14 Wolf's build

Post by piperdown » Mon Oct 29, 2018 7:32 am

If it's a 2 cylinder wouldn't you have it set to 180 degrees? Instructions say 2 sparks per revolution at 180 degrees.


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Re: FS14 Wolf's build

Post by Capt UB » Mon Oct 29, 2018 9:19 am

Today on the river...

Just me
Tiny Tach TT 2AM
2017 Tohatsu 9.8 4 stroke

set at 360
4 wraps around one spark wire

out of gear in idle, about 600, should be 950

Don't think it's setup right..

3000 RPM
19.7 mph

Tohatsu prop 7.5 pitch

Running down the river into the wind, same down wind.

Only problem is the short shaft!!

I sent an Email to TT for help.
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Re: FS14 Wolf's build

Post by Capt UB » Mon Oct 29, 2018 7:46 pm

2 cylinders, one power pack to two spark plugs, 4 stroke.

This is what TT tach told me to do...
You need to read both waste spark and hot spark...

TT set to 360 and wrap both spark plug wires.

1029181732a~2.jpg
With TT wrap wires
1029181734~2.jpg
1029181735a~2.jpg
May only need 1 or 2 wraps. I will be using this tach again so red wire is not cut.
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Re: FS14 Wolf's build

Post by OrangeQuest » Mon Oct 29, 2018 8:12 pm

So you should be able to fire it up and set the idle down where it needs to be.
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Re: FS14 Wolf's build

Post by TomW1 » Tue Oct 30, 2018 12:09 am

OQ I think you are a little confused. His motors idle speed is 950 the TT was reading 350 which is not correct and why he e-mailed them.
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Re: FS14 Wolf's build

Post by Fuzz » Tue Oct 30, 2018 12:13 am

Are you sure it is supposed to be wrapped around more than one wire? I bought one a few years ago and never could get it to work right. I still have it but its lost in my shop.

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Re: FS14 Wolf's build

Post by Capt UB » Tue Oct 30, 2018 5:56 am

Fuzz wrote:
Tue Oct 30, 2018 12:13 am
Are you sure it is supposed to be wrapped around more than one wire? I bought one a few years ago and never could get it to work right. I still have it but its lost in my shop.

There is a waste spark (weak) that is on the exhaust stroke, you need the hot and weak spark to get the right readings. On this OB, both spark plugs are powered by the same powerpack (coil). Wrapping both gives you the right reading.

I talked to Steve from Tiny Tach, great guy. He told me what to do.
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Re: FS14 Wolf's build

Post by OrangeQuest » Tue Oct 30, 2018 12:51 pm

TomW1 wrote:
Tue Oct 30, 2018 12:09 am
OQ I think you are a little confused. His motor's idle speed is 950 the TT was reading 350 which is not correct and why he e-mailed them.
I am always confused about something Tom but in this case Capt UB stated that the tach was reading 600 at idle and 3000 at WOT. The 3000 is half of the posted max rpm the motor should do. So with it picking up only one of the two cylinders firing then 2x3000=6000 rpm and then 2x600 would be 1200rpms which is to high if the tach is correct at low rpms. If he set it to 180 I bet it would still read correct which I am guessing is the setting for a 2 stroke, 2 cylinder motor. Most automotive diagnostic tachs you just clip an inductive pick up to the #one sparkplug wire and then tell the meter the number of cyl. It also has a timing light function that aids in checking and setting timing. But that was a few decades ago and I am sure things have change a lot since, like coil on plugs and no distributors which was something that was coming out on a few engines when I retired from the industry.
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Re: FS14 Wolf's build

Post by Capt UB » Tue Oct 30, 2018 2:28 pm

Up date on TT setup on this OB (2017 Tohatsu 9.8 4 stroke)

2 cylinders, one power pack to two spark plugs, 4 stroke.

This is what TT tach told me to do...

You need to read both waste spark and hot spark...

TT set to 360 and wrap both spark plug wires. May only need 1 or 2 wraps. I will be using this tach again so red wire is not cut.
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Re: FS14 Wolf's build

Post by Capt UB » Tue Oct 30, 2018 2:52 pm

The waste spark output is not as strong as the hot output.
You add them up....

Just because the manufacturers say 950, you could have anywhere from 800-1050, so many things effect the rpm's. Throttle setup on the carbs, tiller or the remote! Fuel, age of motor, altitude and prevent maintenance! The tach it's self can be off by ???

The only base I have is being in idle, out of gear and being at around 950 rpms.

Getting it close so you can find the right prop is all you need.

7.5 pitch 20 mph @ 3000..... WOT.

Sounds about right on the prop and mph, rpm should be closer to 5000....?

I don't have the weight of the boat, but using 900 lbs. (me gear...) should give Tom something to work with. This Saturday, I'll run the river again and see what WOT reads in rpm's with the new tach setup.
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