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  1. U

    1975 Evinrude 70hp no WOT

    I put the boat in the lake last weekend. Checked out the motor on muffs started and ran fine, maybe just a little skip at 1000RPMs on the muffs. In the water on my 20ft pontoon could only get 2800 rpms no more at higher throttle only more smoke. Checked spark looks good. Compression #1 145...
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    Which Head Gasket 70hp Evinrude

    I am trying to order a new hea I am trying to order a new head gasket for my 1975 70hp Evinrude 70573B When I pull up the part number at Seloc Online I get 2 numbers Sierra Part #18-2960 and low compression gasket # Sierra Part #18-3895 My numbers are cyl 1 145psi cyl 2 120 psi cyl 3...
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    1975 70 hp Evinrude Fuel Filter

    "I installed an inline fuel fi "I installed an inline fuel filter this morning before going to the lake ran ok on the muffs. When I backed into the water and started the motor it fast idled ok but started to be a little erratic I checked the filter and there was practically no fuel in the...
  4. U

    70 Evinrude Linkage Sync

    I have a 1975 Evinrude 70 hp 7 I have a 1975 Evinrude 70 hp 70573B I am having trouble getting the syncronization part down the engine runs good at 2800 rpm but seems like the timing is off at higher throttle and only runs at a low ok at lower rpms. Is there a method of adjustment I am...
  5. U

    Battery charging

    I put a new battery on the boa I put a new battery on the boat about a month ago the other day I noticed the volt meter was registering 14V I don't remember it going that high before is this a problem? '75 70hp Evinrude.
  6. U

    b75 Evinrude 70hp

    I spent 3-4 hours on the lake I spent 3-4 hours on the lake this past weekend. Still did not achieve the WOT that was expected only got 3200 rpm. I pulled the plugs today to get an idea of what I was doing. 1& 2 showed evidence of carbon fouling #3 was clean. How do I interpurt this sorry...
  7. U

    1975 Evinrude 70hp

    "After putting the motor in th "After putting the motor in the shop and going in circles with the Evinrude dealer, could not get anything done to the motor unless I called, then I would find out what they had found this went on for three weeks. Gave up today, picked up the boat, I took it...
  8. U

    Evinrude 70 hp 1975

    "I have just spent an enjoyabl "I have just spent an enjoyable/frustrating day at the lake. I became one of those guys that spent most of the dat running around grinding on their starter with the hood off of their motor. I think I need professional help either for myself or the boat motor. I...
  9. U

    Tachometer does not function

    "1975 Evinrude 70hp tachometer "1975 Evinrude 70hp tachometer does not work. How do I check for signal, I have looked for troubleshooting in the manual, and have over looked. Got the gray wire in the wiring harness, but from there what am I looking for? Pulse signal voltage level don't know..."
  10. U

    1975 Evinrude 70 hp

    "I am learning maybe more than "I am learning maybe more than I wanted to know about 2-cycle outboards, trying to resurrect an engine out of storage. Thanks to this group I haave cleaned carbs, #2 had float stuck wide open and disintegrated gasket. Finally got it started but has no idle and...
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