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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a 2cycle robin engine that has an intermittent spark

Customer Question

I have a 2cycle robin engine that has an intermittent spark but only when the plug is in the engine
JA: Can you guesstimate how old the engine is? And has it done anything like this in the past?
Customer: 87 ergo and yes it would backfire
JA: Do you plan on doing the work yourself?
Customer: Yes
JA: Anything else we should know to help you best?
Customer: The igniter is new and we get good spark until it's in the engine
Submitted: 9 months ago.
Category: Small Engine
Expert:  JON replied 9 months ago.

Hi, my name is ***** ***** me review the issue, and I will be more than happy to help resolve it as quickly as possible.

Expert:  JON replied 9 months ago.

Sounds like the coil is grounding itself out. remove the ground wire from the coil and try to start machine. If it starts, you will have to pull plug wire to kill the engine. Let me know what happens please.

Customer: replied 9 months ago.
Do you mean pull the neg wire off the coil that comes from the igniter?
Expert:  JON replied 9 months ago.

yes, you have the plug wire and then a small wire, normally black or green. may be other color on this machine

Customer: replied 9 months ago.
I won't start
Customer: replied 9 months ago.
It won't start
Expert:  JON replied 9 months ago.

you have a bad ground at the coil, and will need a new coil.

What is the coil gap set at on this engine?

I am assuming you have a new spark plug already

Customer: replied 9 months ago.
It won't startthatway
Customer: replied 9 months ago.
We have tried a new coil same result motor runs well then when it warms up misses also tried new plug