Thread: Johnson "70mod"

  1. #71
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    ha ha we all forget the simple things. the hard things we all remember, bu the re-torque the main head bolts we forget about .
    glad you have found your water problem, you will be fine soon

  2. #72
    Team Member LittleCharger's Avatar
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    Quote Originally Posted by hupiveneilija View Post
    Ordered J-B Weld HighHeat epoxy putty for relief holes and solved the water issue; What a dumbass I am, forgot to retighten the head bolts so they werent tight enough and water went to cylinder(s) and gasket was also broken between thermostat and #1.

    I bet it run better after fixing those

    Good night everybody!
    Keep an eye on the head gasket a tight head like that tends to blow them, head studs help

  3. #73
    Team Member hupiveneilija's Avatar
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    Ill do that, thanks!
    Have to find studs & nuts somewhere.

    BTW Good Morning!

  4. #74
    Team Member LittleCharger's Avatar
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    Quote Originally Posted by hupiveneilija View Post
    Ill do that, thanks!
    Have to find studs & nuts somewhere.

    BTW Good Morning!
    What size of main jet are you starting with?

  5. #75
    Team Member hupiveneilija's Avatar
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    I have original mainjet now, dont remember what it is in those carbs. Made 1 WOT and shutdown, plugs look ok. Pulled head off last night, pistons seems like ok to me.
    Have to do those reliefholes with J-B and assemble the head back, then can go out and drive more so that i can see how pistons look by the transferports.

    Must get tachmeter wich shows to 8000.

    Ouh yes, I replaced those reedbodies, wich Ive stuffed all around, with stock ones. It felt like fighting against itself in high rpms. Better now but weakened lower end, have to find that sweet middle.
    And stock tuner in Place, still revs like hell with 18in prop.
    There is some tuning to make.

    Btw is it any good to use coppergasket spray with headgasket?

  6. #76
    Team Member hupiveneilija's Avatar
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    This is how pistons look. #1 is clean because of water.
    Attached Images Attached Images   

  7. #77
    Team Member Roflhat's Avatar
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    Cool build

  8. #78
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    why not put a slightly bigger prop on and save it revving to the moon, there is no point revving the nuts out of it with a 18 pitch.
    you were running the 23 before the work, you wont know if its any stronger until you try that prop on it.

    How many hours run are on it now since new rings put in ? 3 , 5 ?

  9. #79
    Team Member hupiveneilija's Avatar
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    I will put 23 next time I go out. Its got only max 2h. Have to wait that J-B so it takes few days.
    What a luck, we have 1 company here that sells it.

  10. #80
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    not sure even the jb weld will hold up.
    if it is nice and smooth in the holes you have no chance of it staying there. needs to be rough inside the holes
    I think maybe alloy welding is the best way, then the sleeves dont get a chance to warp with steel welding.

    hope the jb weld does work, makes it a real easy job.

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