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  1. jimmbo

    Black scuff marks on cylinder walls

    Not yet. If the scoring doesn't get too bad, it likely can be machined to 30 thousands overbore, so as racer says just run it, might last several yrs....
  2. jimmbo

    Boats from work.

    That Cobalt looked like a lot of the Glass was not saturated with Resin. Seems top more and more Common the past 20 yrs I had a Transom Delamination, and Glastron did Eff All, so much for their POS VEC Lifetime Warranty
  3. jimmbo

    Black scuff marks on cylinder walls

    Actually, with the use of a Good TCW-3 Oil, and the engine properly Propped, Carbon Buildup is quite Low and Slow
  4. jimmbo

    anyone know what size and thread type the outer prop shaft nut is?

    What kind of Tool are you trying to Fabricate? You can take the Nut, to a Nut and Bolt Supply, and they can measure it
  5. jimmbo

    Black scuff marks on cylinder walls

    Fresh Paint can hide a Multitude of Sins As Racer has said, it has been rebuilt, I wouldn't be surprised if those Rings were reused, if they were, they would have fit the earlier Scoring, and are trying to duplicate it on the newer Bore One of the Ports does appear to have what looks like Ring...
  6. jimmbo

    Black scuff marks on cylinder walls

    I see very little carbon on the Pistons Crowns. If the Rings are have Tension and spring back when pushed, the Grooves are likely free of Carbon. How long have you had this Motor?
  7. jimmbo

    Black scuff marks on cylinder walls

    Looking at the Ports, they used a Ball Hone to boot, not good on a 2 Stroke Pistons are 20 thousands over. Those Score Marks are not going Heal.
  8. jimmbo

    1986 Merc 60hp 3-cyl issue

    Was there any water coming out of the Prop, when you were running it on the Muffs? Water coming out from around the Spark Plug, means a bad Jacket Gasket, or more likely, in My Opinion, a warped Water Jacket Cover, which happens when the Motor gets too Hot
  9. jimmbo

    83' 115hp Mercury, prop slip

    I look at it as getting the Most out of the Boat and Motor. Also the faster it goes, the further it goes, on a given amount of Fuel
  10. jimmbo

    Test wheel needed

    They really haven't been used much since the early 80s, as most shops acquired Dynos, which can vary the Load place on the Motor. Have you tried Evil Bay?
  11. jimmbo

    83' 115hp Mercury, prop slip

  12. jimmbo

    83' 115hp Mercury, prop slip

    I wish I could find a 2 Blade that would fit my I/O, I would give up a bit of Acceleration for a few more mph at the Top
  13. jimmbo

    1977 85 H.P. Evinrude Model # 85895C S# J0003143. Low idle issue.

    Don't give the Bean Counters any Ideas
  14. jimmbo

    Test wheel needed

    Manufacturers' Test Wheels were of a known Load for the engines they fit, not likely to be attained by butchering a Prop.
  15. jimmbo

    1977 85 H.P. Evinrude Model # 85895C S# J0003143. Low idle issue.

    It wouldn't be revealed in a Cylinder Compression Test, as Air can enter the Cylinder via the Exhaust Ports, instead of via the Crankcase. Crankcase Compression Ratios are even lower than Cylinder Compression Ratios, and Maybe a Reading can be obtained off a Fuel Pump Port for one of the Crankcases.
  16. jimmbo

    1977 85 H.P. Evinrude Model # 85895C S# J0003143. Low idle issue.

    Low Crankcase Compression is not revealed during a Cylinder Compression Test
  17. jimmbo

    1977 85 H.P. Evinrude Model # 85895C S# J0003143. Low idle issue.

    No Argument from me. It is a Great Way to determine if it worth putting any Time and/or Money(or as you say. "Beer Tokens") into an Engine
  18. jimmbo

    Points for a 1975 Mercury 7.5

    A Serial Number is the best way(and in some cases, the Only way) to get the correct Parts Listing for Mercs
  19. jimmbo

    Points for a 1975 Mercury 7.5

  20. jimmbo

    !976 OMC 5.7

    I guess they did use a SBC, I only remember the 235hp 351 Ford
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