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Jan 23rd, 2013
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89 XR4 150hp - ignition question #12746885
05/08/18 12:56 AM
05/08/18 12:56 AM
Joined: Oct 2017
Posts: 7
San Antonio
M
MattWags Offline OP
Green Horn
MattWags  Offline OP
Green Horn
M

Joined: Oct 2017
Posts: 7
San Antonio
Does anyone know how many times each spark plug fires per revolution?

Basically I'm bringing my old XR4 back to life and it has a bad voltage regulator which I have disconnected. So before buying a new voltage regulator and stator to convert away from the problematic water cooled regulator I want to run the boat and stress test the motor. But with the voltage regulator being smoked I have no tach, so I bought a simple inductive tachometer where you wrap a wire around one of the spark plug wires and I need to set it based on number of sparks per revolution for that single spark plug so it can calculate the RPMs right.

I hooked up the inductive tach tonight and the "3 sparks per revolution" setting looked to be the most accurate but I wanted to double check and see if that's correct for this motor.

Last edited by MattWags; 05/08/18 12:57 AM.
Re: 89 XR4 150hp - ignition question [Re: MattWags] #12747166
05/08/18 03:38 AM
05/08/18 03:38 AM
Joined: May 2003
Posts: 11,491
Littlefield Tx & Lake A. H. US...
gary purdy Offline
TFF Guru
gary purdy  Offline
TFF Guru

Joined: May 2003
Posts: 11,491
Littlefield Tx & Lake A. H. US...
Ones every revolution. You can connect your grey tach wire to one of the yellow wires of the stator at a yellow wires connection.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: 89 XR4 150hp - ignition question [Re: MattWags] #12747184
05/08/18 04:12 AM
05/08/18 04:12 AM
Joined: Mar 2003
Posts: 1,292
Cisco,tx
scruboak Offline
Extreme Angler
scruboak  Offline
Extreme Angler

Joined: Mar 2003
Posts: 1,292
Cisco,tx
1

Re: 89 XR4 150hp - ignition question [Re: gary purdy] #12747802
05/08/18 07:10 PM
05/08/18 07:10 PM
Joined: Oct 2017
Posts: 7
San Antonio
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MattWags Offline OP
Green Horn
MattWags  Offline OP
Green Horn
M

Joined: Oct 2017
Posts: 7
San Antonio
Wonder if this inductive tach is picking up noise then, the 1 per revolution setting said it was idling at 2400 rpm and there's no way it was that high.

Hooking the grey wire to one of the stator's yellow wires won't send too much current to the tach and smoke it?

Re: 89 XR4 150hp - ignition question [Re: MattWags] #12748339
05/09/18 01:39 AM
05/09/18 01:39 AM
Joined: Oct 2017
Posts: 7
San Antonio
M
MattWags Offline OP
Green Horn
MattWags  Offline OP
Green Horn
M

Joined: Oct 2017
Posts: 7
San Antonio
Tried hooking up three different tachs to each of the yellow stator wires but got no readings on the tach, just stayed at 0.

Re: 89 XR4 150hp - ignition question [Re: MattWags] #12748342
05/09/18 01:39 AM
05/09/18 01:39 AM
Joined: Oct 2017
Posts: 7
San Antonio
M
MattWags Offline OP
Green Horn
MattWags  Offline OP
Green Horn
M

Joined: Oct 2017
Posts: 7
San Antonio
Tried hooking up three different tachs to each of the yellow stator wires but got no readings on the tach, just stayed at 0.

Re: 89 XR4 150hp - ignition question [Re: MattWags] #12748373
05/09/18 01:52 AM
05/09/18 01:52 AM
Joined: Mar 2003
Posts: 1,292
Cisco,tx
scruboak Offline
Extreme Angler
scruboak  Offline
Extreme Angler

Joined: Mar 2003
Posts: 1,292
Cisco,tx
yes that is possible on muffs

Re: 89 XR4 150hp - ignition question [Re: MattWags] #12748376
05/09/18 01:53 AM
05/09/18 01:53 AM
Joined: Mar 2003
Posts: 1,292
Cisco,tx
scruboak Offline
Extreme Angler
scruboak  Offline
Extreme Angler

Joined: Mar 2003
Posts: 1,292
Cisco,tx
Mine idles at about 1800 on muffs much diff on lake

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