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  1. flyingscott

    OX- 66 - 2 stroke - 250 Yamaha , Think I have fuel issue after filter change ?

    Have you cleaned the O2 sensors?
  2. flyingscott

    Does the switch box impact the rev limiter?

    5250 is tops for that motor. Anything above 5500 you risk broken piston skirts. Like I said thevrev limiter is normally on the jets not the props.
  3. flyingscott

    Will it Work? - Joe Reeves Timing Method

    Yes you can use the joe reeves method. You need to defeat the Qwik start feature.
  4. flyingscott

    Motor revs up but doesn’t go anywhere?

    Take it to a shop and have them diagnose it.
  5. flyingscott

    Mariner doesn’t go into forward or reverse.

    I thought that was an American made Mariner. My fault but that motor is worse. The Yamaha made Mariner has next to 0 parts support for that motor get your money back. Don't even bother taking it apart get your money back. Hopefully you did not pay a lot for it.
  6. flyingscott

    Mariner doesn’t go into forward or reverse.

    We need to know which lower unit you have. A design 1 or design 2. Design 1 has a bushing in it that will need to be replaced. That drive shaft is north of 250. Easy to find out take the lower off remove the water pump and pull up on the drives shaft. If it comes out freely it is broken. You can...
  7. flyingscott

    1992 70hp Johnson - electrical issue - continued new

    That should not have been on the front of the motor. The negative battery cables and all grounds are attached on the exhaust plate of that motor. You need to have the negative battery cable attached to the block.
  8. flyingscott

    Mariner doesn’t go into forward or reverse.

    Drop the lower unit and see if the drive shaft is broken. Extremely common on those.
  9. flyingscott

    Can trim pump be added to a 40hp that didn't come with it?

    Lower unit is still less than steller.
  10. flyingscott

    1992 70hp Johnson - electrical issue - continued new

    Slow starter generally means bad ground. Look at where the battery ground is connected to the exhaust cover. If it uses the original extended stud that needs to be shiny clean. That is a weak spot on OMC motors. All connections need to be SHINY clean
  11. flyingscott

    Hooked up my battery with the wrong polarity

    Yup having inside motor parts become outside motor parts are the main issue.
  12. flyingscott

    1976 25hp Johnson ignition question

    Replace the points and condensers with factory replacements. Those ignition are notorious for burning up condensors.
  13. flyingscott

    Force 70 HP - Full throttle in reverse but underpowered in forward

    Well with 1 carb rules out over fueling. Pull the head.
  14. flyingscott

    Can trim pump be added to a 40hp that didn't come with it?

    Lower units are less than durable. And if it is in the 88-92 Era that is a 5 yr only lower.
  15. flyingscott

    Force 70 HP - Full throttle in reverse but underpowered in forward

    Your top cylinder has an issue. I would expect your spark to jump 7/16" gap. Is that a single carb motor?
  16. flyingscott

    Can trim pump be added to a 40hp that didn't come with it?

    Looks closer to an 88-91 model. Get a better pic of the tag as the model # will tell you exactly. That yr would have used an external TNT. Better to buy an aftermarket unit for it.
  17. flyingscott

    Force 70 HP - Full throttle in reverse but underpowered in forward

    Your motor is running on less than 3 cylinders. Your reverse test proves absolutely nothing.
  18. flyingscott

    Lowest compression you’d buy

    Well the buyer got a good deal. The electric start bracket was worth more than he paid for it. Those motors on the healthy side should be about 140 psi.
  19. flyingscott

    Does the switch box impact the rev limiter?

    The rev limiter should be set at about 5500. 5250 is the top rpm of the motor to prop for.
  20. flyingscott

    02 mercury no plane

    Check the fuel system, filters and VST if it has one. Then check spark make sure it jumps 7/16" air gap. Then get the factory nanual
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