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2026. 6. 30. 작업

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Symptoms of Lean or Rich carb settings on a motorcycle

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Lean and Rich Symptoms in Motorcycle Carburetors In your post you indicate that some of the symptoms you have read are contradictory. I will try and clarify between the two conditions and attempt to give you guidelines in troubleshooting between the two. Background Motorcycle carbs have a few circuits that effect different throttle positions. Idle Circuit - for idle and off idle Pilot Circuit - small effect on idle. Higher effect at lower RPM's with decreasing effect to full throttle Needle jet/jet needle - Mid range circuit Main Jet - Wide open. Fuel is metered through the main by the jet needle at different throttle positions. Choke circuit - Initiated by a valve or butterfly that increases the vacuum and opens the circuit up. Cold starting and warm up. Symptoms of Lean and Rich Here are some basic symptoms, some duplicate Lean Reduced Power - Sluggish at certain RPM's. Wide open throttle yields no power. The engine may bog down until you reach a lower RPM and then suddenly power ret