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Outboard motor issue: Idles great, doesn't plane....?
I have a 95/96 Mercury Force 120 outboard motor that sat for a year but I got to turn over perfectly. New plugs, fresh fuel from an external tank, compression was fine on all cylinders. We threw it in the water and it started up fine, idled fine once again. Putting a load on my 19ft Proline center console it wouldn't plane. Bogged down or just wouldn't raise RPMs after 8 knots. I don't have a RPM gauge but listening the motors sound just leveled out at full throttle. It could easily be a carb adjustment, maybe? If anyone has some things I should check specifically I would be very grateful. Nobody wants to look at any motor more than 10 years old now days, and my motor just hit the limit. Thank you for any help I can get.
2 Answers
- CBLv 75 years ago
Do the cheapest, easiest things first. Change fuel filter, inspect cap and rotor (I had a tracked rotor on a 5L and it started idled and would almost plane or slow go up to plane - it was the cap corrosion on the inside contact points of the ignition wires). Make sure the fuel is good, ohm the coil, ohm the ignition wires replace as necessary but test first. It has to be one of the above if the throttle linkage is not slipping or failing to open the carb to full throttle.
- mactheboatLv 65 years ago
If you are saying that the engine revs out but the speed does not increase. check the rubber insert in the prop - it may have dozed while the engine was laid up.
