Akros Tec 50cc went bang

I was riding home the other day, doing about 45-50k/h when, with a bang, I lost power and slowed to a reluctant stop. Luckily I was only a few blocks away from home instead of an 8km walk pushing a dead moped!

On inspection, I found that the screw holding what appears to be the CDI unit had sheared off, and the unit was floating free, with a wire detached. I'm assuming it's the CDI, as it has two small detachable wires, and the lead to the top of the spark plug coming out of it, please correct me if I'm wrong!

There seems to be petrol getting to the engine, and the finger-in-the-hole compression test is okay, so hopefully it's nothing mechanical. I spark-tested, but the pissy little spark I was rewarded with was less than satisfactory. Can the CDI have shorted somewhere and blown up on me? Electric start and all other electrics appear to be okay. Service history includes recently having a top-end rebuild, new rollers, new drive belt and the muffler de-baffled due to major blockage.

Any help/suggestions would be greatly appreciated.


Mellack the Rideless :(

Re: Akros Tec 50cc went bang

🦺πŸ₯‡b to the MOPO 🚨🚨🚨 eff /

The Akros Tec is a scooter, not a moped. You might have better luck finding people that know about your particular scooter on a scooter forum. This, as the name implies, is a moped forum. :D

It certainly sounds you're talking about the CDI unit. You might want to find someone with a compression tester (or buy one, they're not that expensive), to be sure. Even 20 psi will pass the "finger" compression test, but it's totally insufficient for running most engines.

Re: Akros Tec 50cc went bang

Thankyou for the reply, Brianf, is muchly appreciated.

On further tinkering, it would appear that the unit that broke its moorings was actually the coil assembly. It seems to be okay on testing with a multimeter (11.67 kOhms from spark plug cap to either terminal, 0.00 ohms between terminals, again correct me if I'm misguided!), which leaves spark plug (replaced) or CDI, which I'm at a loss as to how to test.

Again, thanks for the input, even though my machine's not exactly a moped in the classical sense of the word.

Kind Regards,

Mellack :)

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