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Small Engines (Lawn Mowers, etc.)/Chinese 110cc motor has no spark

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QUESTION: Hey there, I know this isn't a lawn mower or anything but i figured it was about the same idea if not where could i go for help?. I got this small Red Cat 110cc four wheeler that didn't run off a trade. after looking at it ive noticed it has no spark from the spark plug when i pull it out and lay it on the frame or case. Ive put a different spark plug that i knew worked into the ignition coil and tried it and still no spark (the plug wasn't made for that engine but i figured there basically the same. I didn't want to buy a hole new plug just for testing.Anyway I have checked the electrical measures from the CDI and they all check out. It has a 4 pin CDI on it. I have even takin a voltage meter to the ignition coil right where it connects to the spark plug and it reads some volts when i turn it over. Any help on what else it could be??? thanks alot! Tyler

ANSWER: CDI can be difficult to test.  If the igniion module is one piece you can try dis-connecting all the wires connected to the module and re-testing for spark.

The trouble may be with a pick-up or signal module.  The module might be bad and not triggeriing the ignition module to produce spark.

Are you able to trace each wire of the connector and determine where it runs?  Have you checked Google and message boards to see if others have had a similar problem?

Eric

---------- FOLLOW-UP ----------

QUESTION: I have looked and i cant really find something to match. but what is the ignition module? Is that the ignition coil?

Answer
On some CDI systems there was a trigger on the camshaft or flywheel which provides the timing signal to the coil to produce spark.

Many of the Chinese engines are old Honda engines, or very, very similar.  Have you checked the message boards for Honda 110cc atvs to see if your engine is similar?

Eric

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Eric A. Jones

Expertise

Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.

Experience

Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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