1967 evenrude 9.5 model 9722m

[dshen56]

Acouple of weeks ago I bought this motor and went to the guys house to check it out. It started right up on second pull. A long story short I bought it.When the guy I bought it from was showing me how good it ran the cowling was off.It really sounded good and ran great in the barrel. When I got it out to the lake , it started fine but could not get any power out of it. Just for the heck of it I took off the cowling and it ran great. It was a nice day at the lake so I kept the cowing off untill I went home.Why dose it run good with out the cowling? And run bad with the cowling on. Thanks for any help.

 

[jeff_smith_0423]

Re: 1967 evenrude 9.5 model 9722m

Exhaust leaking into the cowling is common on those buggers. Could be from the exhaust relief hose or from the midsection. Use the search - that condition has been documented a few hundred times around here. A lot of people just run them with the cowling off.

 

[bktheking]

Re: 1967 evenrude 9.5 model 9722m

Do a search on the forum, this topic has been discussed many times. To make a long story short the motor is sucking it's own exhaust in through the carb, there is a leak somewhere, several places are suspect.