I've got a problem that sounds similar to yours. Any input would help:
I've got a 1982 70 hp evinrude. It starts good. Sounds good at idle. Last week went out and it wouldn't get over 7 mph. RPM's only about 2500 and engine sounded bogged down. Replaced primer bulb, took it out a couple days ago and ran great for 10 minute trip out, shut it down, fished for 30 minutes. Started up again and ran good for another 10 minutes. I went to take off again and it dropped down on RPM's and was bogged down. Yesterday, I replaced the hose fittings on both ends of the fuel line and the same thing happened. It ran great for two 10 minute trips, then went to come back in and it wouldn't get up to power. It seems to rev up every 5 seconds or so for a split second and then drops back down. Pumping the primer bulb while running doesn't do anything. Water seems to be flowing good. I changed out the lower gear unit oil and it seemed okay. It does drip excess oil from behind the prop, but it doesn't match the lower gear unit oil so I figure it must be unburned oil from the mix. Any guesses?
I've got a 1982 70 hp evinrude. It starts good. Sounds good at idle. Last week went out and it wouldn't get over 7 mph. RPM's only about 2500 and engine sounded bogged down. Replaced primer bulb, took it out a couple days ago and ran great for 10 minute trip out, shut it down, fished for 30 minutes. Started up again and ran good for another 10 minutes. I went to take off again and it dropped down on RPM's and was bogged down. Yesterday, I replaced the hose fittings on both ends of the fuel line and the same thing happened. It ran great for two 10 minute trips, then went to come back in and it wouldn't get up to power. It seems to rev up every 5 seconds or so for a split second and then drops back down. Pumping the primer bulb while running doesn't do anything. Water seems to be flowing good. I changed out the lower gear unit oil and it seemed okay. It does drip excess oil from behind the prop, but it doesn't match the lower gear unit oil so I figure it must be unburned oil from the mix. Any guesses?
