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Briggs 14.5hp motor

#1

T

tim2

A guy brought me his mower because it would not start.I started checking and he has bypassed all of the safety switches. I checked for spark and it will not spark when you are holding the key in the start position, but when you relase it the plug will fire tw0 or three times. I am hoping someone can give me ideas on what I need to check for next. I am at a loss and his yard is growing out of control. Hoping I can help a neighbor out. Thanks in advance.


#2

S

shiftsuper175607

tim2 said:
A guy brought me his mower because it would not start.I started checking and he has bypassed all of the safety switches. I checked for spark and it will not spark when you are holding the key in the start position, but when you relase it the plug will fire tw0 or three times. I am hoping someone can give me ideas on what I need to check for next. I am at a loss and his yard is growing out of control. Hoping I can help a neighbor out. Thanks in advance.
Click to expand...

There are interlocks on the safeties, you just can't by-pass them all.
Try and hook the safeties back up and then go from there.


#3

S

SeniorCitizen

Being he has disconnected all the safety switches, go one step further and disconnect the mag ground kill wire and maybe he can get his grass mowed if it will run disconnected. Then between mowing maybe you will have time to find the problem.


#4

T

tim2

OK, I dug a little deeper and found the only switch he bypassed was the PTO switch. I am not a mower repair guy so give me a break and don't get to technical on me. I can only see the plug firing when you release the key from the start position.


#5

T

tim2

OK, back in from the garage. I rewired the PTO safety switch and still having the same results(firing when you release the key) Where do I find this mag ground kill wire? I have to try something and I am really grasping at straws.


#6

B

bertsmobile1

tim2 said:
OK, back in from the garage. I rewired the PTO safety switch and still having the same results(firing when you release the key) Where do I find this mag ground kill wire? I have to try something and I am really grasping at straws.
Click to expand...

If you really want us to help you you need to help us.

Briggs & stratton do not specify what safety switches are to be used with their engines
Secondly there are a dozen or more 14.5 Hp Briggs & Stratton engines.

So if you are grasping at straws just imagine what we are going through trying to help you.

Oh and usually the cut out wire will come out either behind the starter motor or behind the carburettor controls and I can not tell ou which place to lok or even what colour the wire willbe becaue you won't tell me what the motor actually is and what it is fitted into.


#7

Boobala

Boobala

bertsmobile1 said:
If you really want us to help you you need to help us.

Briggs & stratton do not specify what safety switches are to be used with their engines
Secondly there are a dozen or more 14.5 Hp Briggs & Stratton engines.

So if you are grasping at straws just imagine what we are going through trying to help you.

Oh and usually the cut out wire will come out either behind the starter motor or behind the carburettor controls and I can not tell ou which place to lok or even what colour the wire willbe becaue you won't tell me what the motor actually is and what it is fitted into.
Click to expand...

So tell me Bert ..... how many times have you had to ask for the info. to help someone....??? This is EXACTLY why I suggested a Welcome page or notice of some sort specifically telling people looking for help to supply some vital info. I " see " how frustating AND time consuming it is .......... Boobala ..... :mur:


#8

T

Tinkerer200

SeniorCitizen said:
Being he has disconnected all the safety switches, go one step further and disconnect the mag ground kill wire and maybe he can get his grass mowed if it will run disconnected. Then between mowing maybe you will have time to find the problem.
Click to expand...

Good advice, can't figure out why he took the mower to someone "who isn't a mower repair guy".

Walt Conner


#9

T

tim2

In my last posts I said that all the safety switches were hooked back up and it still only sparks when you release the key from the start position. Briggs & Straton model# 287707 0225 01.


#10

B

bertsmobile1

Boobala said:
So tell me Bert ..... how many times have you had to ask for the info. to help someone....??? This is EXACTLY why I suggested a Welcome page or notice of some sort specifically telling people looking for help to supply some vital info. I " see " how frustating AND time consuming it is .......... Boobala ..... :mur:
Click to expand...

the only way this would work was to have the post page formatted with mandatory fields for mower brand, model number, Dom, engine maker, engine code.
However 1/2 the people do not know this information and many need to be told how to find it.
Then there is the confused/ mechanically challenged who would be put off and scared to post without it.
There is a fine balance between accessibility and convenience.
I am not a big fan of stickies as most poeple just jump past them.
The look at the "Introduce yourself" sticky at the beginning of each makers list.
If you go throught them yu will see person after person saying "Hello I have a xyz with this problem" which is exactly what the stick tells them not to do.
And then if you read the whole 20 odd pages you will see the same 4 problems over & over &over &over so no one ever bothers to read the posts.


#11

B

bertsmobile1

tim2 said:
In my last posts I said that all the safety switches were hooked back up and it still only sparks when you release the key from the start position. Briggs & Straton model# 287707 0225 01.
Click to expand...

And Tim,
For the last time.
Your problem s not the engine, it is the mower.
If you won't tell us what the mower is we can not tell you how to solve your problem save a gallon of gas and a well placed match

The spark is controlled BY THE BLOODY MOWER not the DARNED ENGINE
so unless the cut out wire is earthing out to the engine some where under the top engine cover your problem is with the wiring of the mower.
When you pull off the top cover on the engine you will also see the cut out wire so you will know where it comes out og the mower .
You will also find the plug which will disconnect it from the entine control system so you can start it but not stop it.
Good luck and remember Darwinism is real Creationism is not so the LOrd will not stop idiots killing themselves which i why the Government made all these safety switchs mandatory.


#12

T

tim2

It is a Murray model #42704X8B


#13

Boobala

Boobala

tim2 said:
It is a Murray model #42704X8B
Click to expand...

Wiring Diagram ........... Murray lt Parts Diagram Index for 42704X8B

CLICK on link ( above ) go to electrical section and click again . This MIGHT help ! .......... Boobala ..:smile:


#14

I

ILENGINE

Tim, remove the blower housing from the top of the engine. Locate the ignition module next to the flywheel. There should be a single wire connected to that module. Unplug it. Now remember you will need to find another way to kill the engine since there will be no shutoff at this mount without shutting off fuel or grounding the spark plug wire or grounding the prong on the module with something.

If the mower starts and runs then you have a problem with the mower wiring. Most likely a safety switch. On some murray mowers the engine will crank but will not fire if you are not sitting on the seat, so check the seat switch very carefully.


#15

Boobala

Boobala

Have you checked the oil level ...??? Some engine are equipped with a low oil switch to prevent the engine from starting if the oil level is too low, you could pull the plug, squirt some fuel into the cylinder and use a jumper cable direct from the battery positive to the starter terminal , if it starts to run, the problem is in the mowers harness and not the engine........ be sure the battery NEGATIVE has a good clean ground to the frame or engine .......... Boobala :smile:


#16

T

tim2

Well that did not take long. Cleaned the negative ground wire and contact point. No spark. Found and traced the small black wire from the Armaeture, it went under the engine and then was connected (soldered) to a YELLOW wire going to the ignition key. Which the wiring diagam show it as part of the OFF function. Cut the wire and grounded the spark plug and got great spark with the key in start position. Reattach black to yellow and had no spark, until I released the key from the start position then I got two or three sparks.

So a new question. Where should the armeture wire be connected/ I did not dsee any lose or ends of wires laying around.


#17

S

SeniorCitizen

My older murray shows a yellow wire ( Y 4 ) that can be disconnected on left side of the engine. Shown lower left in the schematic. Comes from ignition switch and grounds mag when switch is in off position.

Attachments







#18

T

tim2

Boobala posted a wiring diagram a few posts above. That has the same ignition switch that is on my mower, it has 7 tabs and wires coming off it. The problem is the ground wire coming off the armature was not hooked up to wherever it is suppose to be hooked. and I cannot find where it should or what it should be hooked to.


#19

S

SeniorCitizen

Are you positive that is the DC ( direct current ) mag ground wire that's not hooked to anything and not the AC ( alternating current ) wire for the head lamps.

If that engine doesn't have an electric solenoid fuel cut off on the carburetor it should run with the mag kill wire disconnected. It wouldn't even need a battery or starter but only a way to crank it.


#20

T

tim2

The mag wire is not hooked to anything, thats the only way I can get it to spark.


#21

T

Tinkerer200

First off, just because a switch looks like another one does not mean the poles are the same on them. You need to find a pole which has continuity between it and the engine block when the switch is in the Off position and only in the Off position. Note I said continuity. This will be your "Kill" wire connection to connect the little wire coming from the MAG, to.

Walt Conner


#22

T

tim2

Got it Tinkerer going to take another look right now.


#23

T

tim2

There is not one lug that has continuity inall key positions.


#24

T

Tinkerer200

tim2 said:
There is not one lug that has continuity inall key positions.
Click to expand...

Read my post again, more closely.

Walt Conner


#25

T

tim2

I read it more closely and went and spent a few hours trying to find the right spot to hook it up to on the ignition switch and could not get it. So it's sitting there while I have a cold one. Still lost in space.


#26

T

tim2

Anymore suggestions?


#27

C

cryoburned

I see this on cars with bad starters or relays associated with the starting circuit. Have power in "run" but not "start." If you jump start them while the key is in run, they start right up. I know you posted a model number for your problem mower, and I haven't looked to see if this information is applicable, but perhaps it is.


#28

B

bertsmobile1

1) put padlock on fridge door
2) go to bed, get a good nights sleep
3) reread the post from those who are trying to help you.
We are not there so no one is going to tell you the pink wire goes on the top left the blue goes underneath and the primrose, with the pink & Blue go in the loo.
No no no that is a toilet paper add which is where this thread is going


Now 23 days ago Boobala posted the link to your wiring diagram and you acknowledged that you had the same switch on your mower.
SO incase you are electrophobic the switch codes go like this
G = GROUND, or negative or earth or "Has continuity with the engine in all positions"
M= MAGNETO and what do you know it has a mysterious alien YELLOW wire attached to it, now lets try and think ummm eerr gees got have another couple more beers , where did I see that yellow wire before ?

POSITION 1 OFF
G + M + L
Derrr, give me a couple more beers Umm thats errr, geees what do you know magneto is connected to ground so no spark with the key in the OFF position, well who would have thought, better have another couple of Buds so that can sink in.

And just so total blithering idiots can not stuff theings up totally the G, GROUND, EARTH , NEGATIVE, WIRE THAT HAS CONTINUITY WITH THE ENGINE
Call it what you like is not part of the plug and is slanted at a different angle to all of the other wires just like it looks in the diagram.


#29

Boobala

Boobala

bertsmobile1 said:
1) put padlock on fridge door
2) go to bed, get a good nights sleep
3) reread the post from those who are trying to help you.
We are not there so no one is going to tell you the pink wire goes on the top left the blue goes underneath and the primrose, with the pink & Blue go in the loo.
No no no that is a toilet paper add which is where this thread is going


Now 23 days ago Boobala posted the link to your wiring diagram and you acknowledged that you had the same switch on your mower.
SO incase you are electrophobic the switch codes go like this
G = GROUND, or negative or earth or "Has continuity with the engine in all positions"
M= MAGNETO and what do you know it has a mysterious alien YELLOW wire attached to it, now lets try and think ummm eerr gees got have another couple more beers , where did I see that yellow wire before ?

POSITION 1 OFF
G + M + L
Derrr, give me a couple more beers Umm thats errr, geees what do you know magneto is connected to ground so no spark with the key in the OFF position, well who would have thought, better have another couple of Buds so that can sink in.

And just so total blithering idiots can not stuff theings up totally the G, GROUND, EARTH , NEGATIVE, WIRE THAT HAS CONTINUITY WITH THE ENGINE
Call it what you like is not part of the plug and is slanted at a different angle to all of the other wires just like it looks in the diagram.
Click to expand...

Well T****r ( Bert ) , would'nt it be nice if we were able to fix this like ( have you seen this on TV ) a Doctor in New York is performing surgery on a patient ( through the use of computers , cameras, and robotics ) somewhere in the Australian outback .... life would be so much simpler , don't you agree ...??


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