Motor Vehicle Maintenance & Repair Stack Exchange
Motor Vehicle Maintenance & Repair Stack Exchange

Questions tagged [outboard]

8 questions
7
votes
2 answers

Spark plug working fine in free air, but hard miss in engine

This is mostly a curiosity question as replacing the spark plugs solved the problem. I have a mercury 40HP outboard two stroke motor. It is a twin cylinder and after running it out of gas it began to have a hard miss on one cylinder. I diagnosed it…
Brydon Gibson
  • 656
  • 7
  • 16
3
votes
1 answer

What kind of "rubber grease" to use on an outboard engine's swivel?

I'm servicing a Tohatsu MFS5B outboard for the first time. The service manual says to use "waterproof grease" in most of the common wear areas, but not for the swivel mechanism. The swivel consists of two bushings and associated grease nipples below…
IsAGuest
  • 231
  • 2
  • 6
3
votes
1 answer

Rusted spark plug well/mating surface - is this a concern?

While changing the spark plugs on a new to me 2014 Yamaha outboard I noticed that 3 of the 4 wells have a fair bit of corrosion in them, this corrosion isn't just in the 'outer' surface of the well but extends to the machined mating surface against…
wild.coast
  • 348
  • 4
  • 16
2
votes
0 answers

Outboard boat motor won't turn off (dieseling)

Bought a 2000 Johnson 50 hp outboard one year ago. Just attached it to my boat and started it up. Motor idled and ran well for a few seconds, then took off on it's own up to a high RPM even with the throttle at idle. Motor didn't shut down when I…
Carlton
  • 171
  • 7
2
votes
0 answers

New 2.5 hp outboard motor has reduced power at full throttle

I have a new 2.5 hp 4-stroke Mercury outboard motor on a 12-foot aluminum boat: I've used the motor four times; 15 km per trip. When I first got the motor, it seemed to have a lot more power at full throttle. Now, there seems to be significantly…
User1974
  • 1,675
  • 1
  • 8
  • 21
2
votes
2 answers

Where is model number on Yamaha 9.9 4-stroke outboard motor?

I recently purchased a used boat with a Yamaha 9.9 4-stroke outboard motor. I’ve tried looking for the model number so that I can buy replacement parts (someone told me I should have a replacement shear pin on hand). But I haven’t found the model…
User1974
  • 1,675
  • 1
  • 8
  • 21
0
votes
1 answer

How do I attach this carburetor part on an Evinrude 8HP?

We have an Evinrude 8HP outboard motor from 1996. It had been operating normally until yesterday, when the motor suddenly stopped responding to the throttle. When we opened it up, we found loose parts: a plastic assembly, a linkage, and a set…
Tashus
  • 109
  • 3
0
votes
1 answer

1996 40hp mariner magnum - no start

The above mentioned motor is new to me. Since it was new to me and I couldn’t be sure if the oil injector was working, I mixed 10 liters fuel 50:1 so I could see if it was consuming oil. After running a while I ran out of gas (shocked at fast it…
Oldoldhouseguy
  • 101
  • 1