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  1. jimmbo

    MerCruiser 5.7L Low-ish Compression

    And buy two that aren't as good
  2. jimmbo

    MerCruiser 5.7L Low-ish Compression

    Not all heads are the Same, some work better than others in a Marine Application.
  3. jimmbo

    1972 Evinrude V4 100hp Selectric issues

    Unless it is Tuned, and the link and sync is part of a Tune Up, You may just be like a Dog chasing its own Tail
  4. jimmbo

    1996 130HP Evinrude

    That makes it sound like a Fuel Delivery Problem. Does the fuel line run directly from the Tank to the Fuel/VRO pump, or are there quick connectors to at the Tank and Engine? if so, have you ever tried running the Engine bypassing the Connector? Have you drained the carb bowls? A bit of Fuel...
  5. jimmbo

    Swapping out rollers for bunks

    That might have been the issue you had, you're supposed to Back in to launch https://forums.iboats.com/threads/peter-backs-boat-down-the-ramp-like-a-pro.706722/#post-5760574 😂🤣
  6. jimmbo

    1972 Evinrude V4 100hp Selectric issues

    Did you sync the Carbs to each other, and to the Ignition Advance? It sounds ok on the Muffs, but you need to have the boat in the the water so the Engine experiences the real operation world. Idle Speed needs to be set on the water, with engine in forward gear. Don't try setting the Idle Speed...
  7. jimmbo

    Mercury throttle hook up

    Is it an inline 6(73 - 77) or a V6(78 or newer)? A Serial number would help in that regard
  8. jimmbo

    Anyone Seen these?

    I remember a lot of People balking at the Cost of the Enertia back in the day, when I was Praising it. I was lucky as my Dealer, just let me take it off of his Boat to try. It made several differences in how the Boat Handled on Plane, It's Tenacious Grip on the water, and how raised both the...
  9. jimmbo

    1962 Merc 450 restoration ..

    It would be easier to inspect them if they were Clean. It is hard to tell if those are pits in the Rollers, especially on the Needle Bearing inside the Roller Bearing, or just Dirt. Bearings are aren't all that Expensive, beats being broken down in the Middle of a Lake. However when replacing a...
  10. jimmbo

    Swapping out rollers for bunks

    With all that extra Timber on there, I hope you aren't exceeding the Trailer's Capacity. The Boat needs to be a few inches further forward as the Rear Rollers should be right under the Transom. That would still apply if Bunks were used The hull to fender clearance shouldn't be an issue as...
  11. jimmbo

    Mercury throttle hook up

    What year is the Engine, as they did make some variations to how the Trunnion was anchored/secured to the Engine as the years went by?
  12. jimmbo

    1980 115 johnson stumbles at 2500rpm low compression cyl 3

    I guess if Gasoline flowed thru the jets for a few thousand years, there might some erosion
  13. jimmbo

    Engine no power under load

    On the earliest Q-jets there was a Tab, that prevented the Air Valve from opening, unless the Coke was fully open. The Secondary Throttle Shaft could be fully open, but the blocked Air Valve did not allow much air through. Later Q-jets got rid of the Interlock on the Air Valve, and modified how...
  14. jimmbo

    1977 Crestliner Muskie 7**, Outboat Restore Project

    Welcome to iboats I look forward to seeing your Restoration. 40 yrs ago I almost bought a Muskie 775 from my Neighbour. It had the 370 for power. At the Time, I was in an OMC Family, and I was Leary about anything from Mercury.
  15. jimmbo

    MerCruiser 5.7L Low-ish Compression

    Welcome to iboats When doing the Leakdown test(Compressed into Cylinder) you had verification that the Valves were Closed? A bit of something is likely keeping the valve(s) from Seating, and thereby Leaking. You can try a few Applications of PowerTune, or Engine Cleaner. Myself I would pull the...
  16. jimmbo

    OMC 3.8l dying at high rpm and weird cranking issue.

    Fuel Starvation perhaps
  17. jimmbo

    1980 115 johnson stumbles at 2500rpm low compression cyl 3

    The extra displacement by a 0.30" overbore is almost Insignificant, and the Main Jetting is always a tad on the Rich Side.
  18. jimmbo

    Fiberglass repair on jet boat bottom

    I think the Trailer needs to be Set Up better, and might need some different parts(Rollers and Associated Parts) to do so
  19. jimmbo

    1980 115 johnson stumbles at 2500rpm low compression cyl 3

    They actually require some Knowledge, and some Skill to actually repair, instead staring at a Laptop screen and Swapping Parts until the Problem is Solved Not everyone is making CEO Salaries, but many items are priced like Everyone is
  20. jimmbo

    Urgent Help needed: Mercury 2002 50ELPT0, Must see picture to understand issue, but don't know how to fix

    You do not adjust the Idle Speed by doing anything to the Carb, Idle Speed on these Engines is determined by the Timing, which will vary depending on the load(prop pitch) the engine is seeing. Get the Correct Service Manual for that Engine, Read, and Understand what the Specs are, what the...
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