[caskland]

Hi,

My son's 150 recently started to misfire on high rpm. I've checked air filter and replaced spark plug. Still same symptom. Looking for advice / idea of what to look at next. Linking video / sound of the misfire. See link here https://drive.google.com/file/d/11THzI6 ... p=drivesdk

Ideas very welcome. Thanks

[Back2-2]

Hello, what you are describing can be many things. Here are just some of the items that could be checked out. This is the order I would go through if I was trouble shooting this problem. Resistance checks on the electrical and jetting would be in the main jet circuit.

Ground cable connection
Coil
Spark plug lead
Stator
Jetting
CDI unit

[caskland]

Thanks a lot for the ideas!

Hello, what you are describing can be many things. Here are just some of the items that could be checked out. This is the order I would go through if I was trouble shooting this problem. Resistance checks on the electrical and jetting would be in the main jet circuit.

Ground cable connection
Coil
Spark plug lead
Stator
Jetting
CDI unit