Identifying a Bad Charging Flywheel

[JC-SuperJet]

So googled this topic and found some Methods for Lawnmower and Outboard Flywheels but not for 2 Stroke Jetski Flywheels.

Good to know before you install that Flywheel you just bought off Feebay or FaceCrook. Or when you're chasing Electrical Gremlins.

One test is to measure the Magnetic Field Strength with a Magnetometer and compare it to that of a Known Good Flywheel. (Field Strength = ?)

Another Test is a Pull Test where the max Load (Weight) or Force is determined and compared to that of a Known Good Flywheel. ( Weight = ?)

Alternately, no pun intended, measuring the AC Current Output from the Charging and Lighting Coils, along with their respective Resistance. If both Coils test within Resistance Specs but yield Low Output Voltages, chances are that the Flywheel Magnets are weak. The Flywheel would have to be installed to do this test...

Clues can be Weak Spark, Low Battery Charge, Cracked Magnets...

Any other ways to identify a Bad Charging Flywheel?

 

[kevbo]

A lot of aftermarket charge wheels have weak magnets when compared to OEM. They tend to get worse with age. Just get a screwdriver and run it around the inside, you can feel the difference.

 

[augustaf]

What are you working on, pray tell- and what are the symptoms?

 

[MTRHEAD]

Send a known good flywheel, one you feel suspect, and a known good stator to OCD solutions. He has a bench tester and can compare the electrical outputs. Many aftermarket flywheels are known to go bad over time and/or with over heating.

 

[WFO Speedracer]

Jetinetics flywheels were notorious for this , they do however make great clocks and paperweights, they are too light to make good doorstops