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Posted: **Sat Dec 12, 2020 4:15 am**

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

Posted: **Sat Dec 12, 2020 1:01 pm**

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

Posted: **Tue Dec 15, 2020 3:53 am**

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

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CRF 150RB misfiring / stuttering on high RPM

CRF 150RB misfiring / stuttering on high RPM

Re: CRF 150RB misfiring / stuttering on high RPM

Re: CRF 150RB misfiring / stuttering on high RPM