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Message: <blockquote data-quote="fringebi" data-source="post: 232378" data-attributes="member: 6712"><p>It sounds like you've done a thorough job checking the common culprits—spark, fuel, and compression. Since the issue persists at higher RPMs, you might want to check the ignition timing, as misfires can cause stuttering at high revs. Another possibility is a failing CDI (capacitor discharge ignition) or a coil that’s weak under load. You could also inspect the fuel lines and petcock to ensure proper fuel delivery, as fuel starvation could cause this stutter. If everything checks out, it might be worth testing or swapping the ignition components.</p></blockquote><p></p>