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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26283
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Mower cranks but has no fire, turf tiger modelstt61v27ch,

Customer Question

Mower cranks but has no fire
JA: What's the make and model of the mower? And can you guesstimate how old it is?
Customer: Scag turf tiger modelstt61v27ch
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: It just cut off and would not Stat back up checked for spark with tester and no fire
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and then connect you two.
Submitted: 6 months ago.
Category: Small Engine
Expert:  Curtis B. replied 6 months ago.

What is the engine model? Cut off under use? Oil level ok?

Customer: replied 6 months ago.
Cut of during use oil level good
Customer: replied 6 months ago.
Eine modelch740s
Expert:  Curtis B. replied 6 months ago.

Do you know what coils it has? One small wire, two small wires are the three wire harness.

Expert:  Curtis B. replied 6 months ago.

See section 8 for ignition.

Expert:  Curtis B. replied 6 months ago.

Typically loosing the spark on a twin engine, makes it an outside sensor or a loss of voltage to the ignition system. Unless it has the fixed timing.

Customer: replied 6 months ago.
Coils have one white wire
Expert:  Curtis B. replied 6 months ago.

remove the white wire and see if you have spark.

Expert:  Curtis B. replied 6 months ago.

White is the kill wire!

Customer: replied 6 months ago.
Removed white wire mower started
Expert:  Curtis B. replied 6 months ago.

So the kill circuit killed the spark. What safety switches does mower have that would kill spark other than oil ? If can be as simple as bad key switch. That is where the kill is made.

Customer: replied 6 months ago.
Tried another key switch did not help there is seat safety both control arm have switches and brake switch
Expert:  Curtis B. replied 6 months ago.

but they do not kill engine. Check wire from keyswitch to coils for a short.

Customer: replied 6 months ago.
Found no short
Expert:  Curtis B. replied 6 months ago.

has to be something that killed the spark. Test oil pressure switch, unplug it and try.

Customer: replied 6 months ago.
There is no oil pressure switch on motor when you up lug white wire from coils will start and still turn off with key
Expert:  Curtis B. replied 6 months ago.

So it fixed itself!

Customer: replied 6 months ago.
No its not fix the white wires are not plugged up to the coils then it runs and with white wire unplugged the key switch will turn the motor off
Expert:  Curtis B. replied 6 months ago.

So it is using the fuel solenoid in the carburetor to kill engine.

Expert:  Curtis B. replied 6 months ago.

Did you find problem? Please rate in a posiitve manner to get me credit and close the question.