Home › Forum › Ask A Member › 1953 Johnson Seahorse 25 hp RD-15 not pumping water › Reply To: 1953 Johnson Seahorse 25 hp RD-15 not pumping water
Are you sure the choke is working correctly? You shouldn’t be able to flood the engine with the primer button if the carb is OK, unless you are priming it when tilted up. But, you speak of rough running and difficulties adjusting the carb effectively. Are you sure you have good spark on both cylinders? Have you had the flywheel off? I’m pretty sure there is an inspection plate over the flywheel that is easily removed so you can have a peak inside. Have a look at the coils, you will need an ignition overhaul if either of the coils is cracked or split.
I may have misread one of your previous posts, but is seems like you may not have had enough water in your test tank. The water level should be above the joint where the gearcase mates to the exhaust housing in order to pump properly. Like Frank says, this water pump is a lousy air pump….