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  1. M

    please help verify correct timing for my motor '82 90 hp

    SN# starts with 622, '82 90 hp I6. lync and sync procedure thread everyone keeps sending me says 4 BTDC at idle and 23 BTDC at max advance, but others on here have told me 4 ATDC at idle and up to 34 BTDC at max advance. Can anyone with the proper manual verify which of these I should be using...
  2. M

    Help me troubleshoot my poor running '82 90hp tower please

    Ok, here are the basics first. Don't remember exact SN# but starts with 622 which makes it an 82. According to original owner less than 300 hours on motor. Looks like brand new inside and out. 90hp purchased this winter with no chance to run it. Good compression 120 across the board cold, 150...
  3. M

    Early 70s merc 650 3-cyl, 2 carb.. 1 bad cylinder. WORTH REBUILD??

    I have a previously strong running 73 or 74 650 3cyl with the 2 carbs and after a stall on the lake this year determined I have a slow leak down on top cylinder. All the wiring, hoses and many parts were replaced on this motor shortly before I got it, and I am wondering, assuming just pistons...
  4. M

    '73 mercury 650 t'n't swap or power head swap???

    Hey everyone, I have a great running 73 merc 650 with no tnt and a 74 merc 650 that runs rough with a good tnt. My question for anyone who has more experience workin on these thing than me is this; would it be easier to try and swap the mounting brackets on the motors so the better runner has...
  5. M

    putting tilt on a motor that came without it

    Hi, new to the site, I have a 74 650 thunderbolt with tnt but a bad lower unit and rough runner. and a great running 650 that came without tnt. is it possible without modification to bolt the better run to my tnt setup???
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