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    head & exhaust plate gasket replacement - 1970 4hp

    First experience with gasket replacement. Head gasket (Sierra) is CMP-4000 material. Sierra recommends dry fit only. Exhaust plate gasket is more antiquated (and very thin) fiber material. Do I use sealant on both faces of exhaust gasket --- and is there a spray alternative to the messy...
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    Epoxy type to use in water jacket

    OK --- How to test water circulation (or simply trace it) with head and exhaust covers removed?
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    Epoxy type to use in water jacket

    1st picture top center: drill bit hole through bolt hole into water jacket. Bolt hole is on exhaust side. Seeking water flow diagram for this 1970 4HP. 2nd and 3rd pictures show water circulation ports in water jacket. No visible water circ port inside exhaust cover. Wish to test water...
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    Epoxy type to use in water jacket

    My assessment: Devcon Aluminum Putty: Best technical attributes of products mentioned BUT not available in small quantity. It's too expensive for my particular application. Marine-Tex Grey Putty: Good fit with possible exception temp tolerance. Rated only for 250F (constant & in dry...
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    Epoxy type to use in water jacket

    Need to fill hole in water jacket. Hole created by drill bit passing through cylinder head bolt hole (at an angle) into water jacket. Idea would be to coat bolt threads with substance to which epoxy will NOT bond. Then screw bolt into cylinder head hole. Then pack appropriate epoxy from water...
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    2000 Tohatsu 5hp — design & reliability comparison?

    Any guidance on design & reliability of a 2000 model year Tohatsu 5hp 2-stroke vs comparable 2-strokes of the era? Looking at one that is branded as a Johnson, but am unfamiliar with that vintage , power rating of Tohatsu.
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    J5RSI (4/2000) -- OMC or Tohatsu motor?

    Thanks. Suppose Tohatsu forum is right place to ask about relative ease of service, design aspects.
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    J5RSI (4/2000) -- OMC or Tohatsu motor?

    Opinion on how it might stack up against 5HP 2-strokes of the era made by OMC, Tohatsu?
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    J5RSI (4/2000) -- OMC or Tohatsu motor?

    Lightweight motor -- if specs are correct @ 43 lbs. Is this 5HP model an OMC or Tohatsu make?
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