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  1. jimmbo

    Just thought I'd share a nice photo.

    Another couple pics of Blue, V6/Black Max Prototype from 1972 - 73 era
  2. jimmbo

    Mercury 850 Hot Start Issues

    Welcome to iboats After it sits for 20 minutes or so, and won't start, have you tried using the Choke again? Even Numbers for Compression, doesn't mean much, as they could all be evenly Low. Check all Electrical Connections for good Contact BTW, 1977 was the last year for an 850, in 78 it was...
  3. jimmbo

    79 Johnson tilt and trim

    Did you recheck the Fluid Level?
  4. jimmbo

    How do I set fuel/air mixture 3L Holley carb?

    On the 2300 the Idle Mixture Screws are on the Metering Block, not the Base
  5. jimmbo

    How do I set fuel/air mixture 3L Holley carb?

    Do 1 and 4 share the same half of the carb?
  6. jimmbo

    79 Johnson tilt and trim

    A lot of Problems with the Tilt and Trim of that design, is from Operators not retracting the Trim Rams in all the way when securing the engine for towing, once the Tilt Lock is engaged
  7. jimmbo

    Want to add additional rollers

    You could spread the Rollers a bit further apart, to lower it a bit, the Crossmember(s) will rotate to redistribute the load. Roller Trailers do tend to put the Boat higher. Switching to Bunks... You need deeper water to Launch/Load with bunks. Your trailer already has 2 more Rollers than...
  8. jimmbo

    Prop advice needed

    Those things didn't last long, in use, or on the Market. Probably shredded a few Gearcases
  9. jimmbo

    Want to add additional rollers

    Not easy to add rollers on a Calkins. Same as my first Boat. I tested it with a 90 merc, and bought it with a 140 Evinrude. It too was on a Calkins, but the older style. FYI the Boat is a Flip of the Crestliner Cruisader 550
  10. jimmbo

    Evinrude Big twin 40

    http://www.fiberglassics.com/library/images/e/ea/Johnsonservice002.pdf
  11. jimmbo

    Lot more new boaters and large wakes?

    I always liked this pic
  12. jimmbo

    Propeller pitch

    WOT: Wide Open Throttle What is the Gear Ratio of the Drive?
  13. jimmbo

    Volvo 3.0 GSP-C carb jets

    Your carb is a 500cfm model In my VP Service manual I did find one 500cfm Holley 2300 that used two different Main jets(all the other carbs used the same jetting on both sides) but it only lists the VP Part# Volvo Penta #3863240 500 CFM Model 2300-2V Pump Lever Clearance. . . . . . . . . . ...
  14. jimmbo

    How to change cap and rotor?

    Label the wires, and take good clear Pictures before any Disassembly
  15. jimmbo

    Prop advice needed

    In the 70s, when the V6 Outboards were introduced the Thru Hub Cleavers props were used on a lot of Racing Hulls as there weren't many Over Hub props out there back then
  16. jimmbo

    79 Johnson tilt and trim

    If the motor is turning, and is turning the Pump, the problem is in the Hydraulics. I suggest a Factory Service Manual for that particular motor
  17. jimmbo

    Piston sleeve hairline cracks

    No, the 1980 uses a 3.5 inch bore, and all the 85 from 1968 thru 1978 have a 3 3/8 inch bore
  18. jimmbo

    Can I use a Johnson/Evinrude tank on Merc outboard?

    Expect to see the Motor run smoother and more Torquey at low speed, but lose some top speed😉
  19. jimmbo

    How to test for spark?

    Sure. As for using a Plug. A Spark jumping a 0.030" gap at Atmospheric Pressure means Nothing. Voltage Requirements go up many-fold when the Cylinder Pressure rises(Denser Air makes a better Insulator). That is the reason for Large Gap for testing
  20. jimmbo

    Prop advice needed

    A 3 blade 15 should bring it up to 4800. If you want to really kill your speed, a 4 blade is the way to go. And you will need to go even lower in pitch. As for Lower Planing Speeds, a Prop doesn't change the Planing speed of a Boat, that is determined by the Hull. The Bow can be forced down with...
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