Search results

  1. N

    What would cause new trigger to fail after 20 hours?

    1983 Mercury 70. SN 9353189 I replaced trigger and stator last summer because they were both out of spec. This cured the problem of not revving past 4000 rpm. Now with less than 20 hours on the engine, the symptoms have returned, and the new trigger is now showing out of spec. What could cause...
  2. N

    Is there any difference between blue/brown band?

    Are there any differences between brown band, blue band, red band, etc? Just interested, i assume its not just aesthestics.
  3. N

    Mariner 25 compression psi?

    1996 25hp Mariner. Cant find what compression to expect in my manual- the engine turns over far more easily than my 86 evinrude 25hp and im worried the compression is low. (both pull start) Thanks, peter
  4. N

    How to reset TDC after flywheel has been off

    1983 Mercury 70 3 cyl. 9353189 I am struggling to line up to TDC, i can just about make out the 0 on the scale on the side of flywheel, but my manual says to set no.1 piston to .491 BTDC with dial gauge then line up flywheel so pointer is in line with that mark. My flywheel is rusted and i cant...
  5. N

    Can a faulty switchbox damage trigger?

    1983 Mercury 70HP Power loss. Can a faulty switchbox damage trigger or stator? I replaced stator as readings were well out of spec. Trigger read in spec. Full power returned for a couple of trips, then suddennly dropped to half power. New stator still tested good, but trigger now tested well out...
  6. N

    Building a test tank?

    How big and what shape do i need to build a test tank to avoid the prop throwing all the water out? i want to be able to thoroughly test my engine and link and sync it while in the driveway. I was thinking 3 feet long, 1 foot wide and 1 to 2 foot deep, with a lid cut around the leg to try and...
  7. N

    83 Mercury 70 Loses power when warm

    When cold will run up to full speed for about 1 min, then lose power down to about 3000 revs. Let it sit for an hour and it will run flat out again then lose power again. Things ive done to eliminate: New fuel pump New fuel line and bulb checked fuel tank vent changed plugs checked...
  8. N

    Johnson 40hp 1976 Gearbox removal problems

    Ive removed the 7 bolts and disconnected the gear linkage as per my service manual- apparently the gear box should now split from the exhaust housing. It is loose but seems to be held up by the drive shaft- does this need to be disconnected at the powerhead or are the splines corroded and...
  9. N

    Mercury 70 engine bog/ loss of power

    starts and idles fine, will run wot for a few minutes then lose power all the way down to idle, and will stall unless you take it out of gear. when it stalls it will start straight back up, will rev in neutral, idle in gear but give it some revs and it bogs down. seems like it happens once the...
Top