Home › Forum › Ask A Member › 6HP Johnson Seahorse – won’t idle › Reply To: 6HP Johnson Seahorse – won’t idle
Did you run the engine before cleaning the carb? If so, did it idle OK? Are you sure it is running on two cylinders? The engine may sound OK when running in neutral in a barrel even though it is running on one cylinder. You mention that it ran OK with the choke in last night, were you running it on a boat in gear? Was the carb dirty/gummy when you pulled it apart, or relatively clean? Are you sure that the carb throttle plate is moving freely and closing fully at idle? There isn’t much to sync/link on this engine, the throttle cam should just contact the roller when the line on the cam bisects the roller. The carb butterfly must be completely closed when idling.
Have you done a spark check? Compression test? Is you fuel oil supply fresh, properly mixed, free of water? Mumbles mentioned that the initial slow speed needle adjustment is 1.5 turns out from gently seated, I would recheck that. Loosening the packing nut will make it easier to set the initial adjustment, gently snug it up again afterwards to avoid air leaks.
Try to post a video of the engine running/trying to idle, perhaps this will help us hear/see what is happening….