Outboard Motor Muffs

[Andyfender]

I want to test out my outboard. Can I use motor muffs to test it instead on a bucket of water? If so, can I give the engine some throttle?
Thanks,

Andy

 

[Daviet]

Re: Outboard Motor Muffs

You didn't say what motor you have. Some can be run on muffs and some can't. Runing on muffs will not tell you if your water pump is working properly, the water pressure will override the pump and cool the engine even if the pump is shot. If you run in a barrel, make sure water level is above the water pump.
You probably shouldn't exceed 1500-2000 RPM while running on muffs or in barrel.

 

[Andyfender]

Re: Outboard Motor Muffs

Its a 1978 35 hp johnson

 

[Daviet]

Re: Outboard Motor Muffs

Yes, you can run that motor on muffs, unless you are checking the water pump operation. To check water pump operation you must run it in a barrel.