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Mid range stumble


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Lets get the facts

421 Driveline cylinders setup

18cc domes

PWK 38mm carbs

CPI pipes

170/55 jetting

140psi

93 octane fuel

 

Did I miss anything?

 

 

If above is correct, you issue is either shitty assembly, or shitty tester and you need way higher than 93 octane.

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Where did you get 18cc domes from. You might have pump gas domes for all you know. If that’s correct you have air Stryker carbs that jet different than regular pwk. If I were you I would pressure test that motor for piece of mind. Get us the letters off the needle 

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Just now, christoph.tamz said:

The guy I bought it from told me this information. How am I to be sure?

Sent from my SM-N920V using Tapatalk
 

post a picture of the motor up close we will be able to tell if they are at least the cylinders you say you have.  

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