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  1. M

    update on "77 1500 lacking power

    I talked to a friend of mine, "Clams" Canino..though he really couldn't point out my problem (being 2.5 hrs away), he informed me that the 1500 only had 130lbs of compression due to the higher port location in the cylinder. What I did do is: remove the powerhead and completely rebuilt it. Here's...
  2. M

    '77 merc 1500 lacking power

    My '77 merc 1500 seems to be lacking power. I started my topic in the prop section because i thought it was an issue with prop being too big. The people that replied to my post indicated my prop size was correct (13 3/4 dia X 19pitch) and they all feel like my motor is down on power. I did a...
  3. M

    Prop sizing (more info)

    Lets start this topic over, but with more detailed info: My boat, a 1975 Glastron V 178...1050lbs hull only...1977 mercury 1500 outboard 300lbs...3 people onboard with total weight of 400lbs...cooler full of ice and drinks 40lbs...12 gal of fuel at 6.75 lbs per gal = 80lbs...anchor 10lbs...misc...
  4. M

    need suggestions on next prop size

    I have a 1975 Glastron V-178 (17.6 feet) bow rider with a 1977 mercury 1500 6 cylinder. I am currently running a mercury black max prop of 13" dia. and 19 pitch. This prop is just a little too big for the boat and normal load I carry...plus I can only get to 4400 RPM's and motor specs say 5800...
  5. M

    '73 johnson 135 questions about producing more HP

    I have some questions about the '73 135 Johnson. Where did Johnson measure the HP from, the crankshaft or at the prop? Next, I was reading some forums about getting extra HP from the 135, one topic mentioned about cutting out the exhaust divider in the bottom of the block, then it went on to say...
  6. M

    1973 johnson 135 pinion gear removal

    Looking for input/crafty ideas on how to dis-lodge Lower Unit pinion gear from driveshaft. I have the pinion gear retaining nut removed, but the gear is stuck up on there pretty good. Im not the type of mechanic to pry on stuff (I considered trying to get a short screwdriver in behind it from...
  7. M

    proper ohm meter for testing electrical components on '73 johnson 135

    I am looking for suggestions about the proper ohm meter/test meter I should be using to do system checks as described in the manual. I have a Sperry digital volt meter that has an ohm setting, but instructions in the Johnson manual references using a "high" and "low" ohm setting...the tester I...
  8. M

    advice on rebuilding 1973 Johnson 135

    As my Thread title states, im looking for advice on rebuilding a 1973 Johnson 135hp. First, I will give a little info about me: I am very mechanically inclined, I have built all types of motors, everything from lawn mowers to V-8 car motors, I have rebuilt many of the Mercury "tower of power"...
  9. M

    Why am i so disappointed in merc 1500

    As thread title states, im very disappointed in overall performance of mid '70's merc 1500. Maybe im expecting too much..i got this thing tweaked to the nth degree, but just seems to be lacking something. As stated in my other Thread, i can move the timing one tooth and its like its on steroids...
  10. M

    Boat/motor guestimate on MPH

    I have a 1975 Glastron V-178 bowrider boat with a 1975 mercury 1500 "tower of power" on it...my question is: does anyone have a guess as to how fast this boat should run at 5500RPM with a 13" diameter 17 degree prop on it....
  11. M

    Need ideas on trading motors

    I have 2 mercury "tower of power" 1500's i would like to trade out...one motor is a 1977 and the other is a 1975 (if i remember correctly)...the 1975 has been recently rebuilt (less than 20 hours on it)...both motors are in excellent condition from top to bottom, serviced annually and well taken...
  12. M

    mid '70's 1500 combustion chamber temperature

    This has been a "burning" question in my mind...since mercury recommends no more than 21 degrees of timing advance, to guard against burning pistons...i want to know if there is anybody that has ideas about how to monitor combustion chamber temperatures in these motors....and from what i have...
  13. M

    1972 glastron GT 150 bow emblem

    I have a 1972 glastron gt 150. Im looking for the round GT emblem that mounts in the center of the bow..does anybody know where to get a replacement emblem or a decal...my gt has the emblem but the lettering has deteriated from the center of it...was this a decal or was it one solid piece...any...
  14. M

    '78 1400 indexing flywheel to flywheel belt cog

    I need affirmation that i have indexed the flywheel to the flywheel timing belt cog correctly on my '78 1400 that has the CD Thunderbolt ignition. I installed the timing belt cog onto the crankshaft (no flywheel) and using a dial indicator i found TDC on #1 piston...i then indexed the dial...
  15. M

    how to make an old boat shine again

    I have a 1975 Glastron V-178 and though it is in great condition, im looking for ideas on how to make the finish shine brightly again. I gave it a good soapy bath, but once it dries, the surface feels chalky...i did put a coat of wax on it but it doesn't take long for that chalky feel to come...
  16. M

    mid '70's thunderbolt tach connection question

    Im trying to solve my thunderbolt tach problems on my '78 1400...the tach im trying to use on my 1400 works fine on my '72 1150, but when i connect it to my '78 1400 it draws the tach needle backwards and it flutters wildly...the ignition set-up on these two engines is exactly the same, but the...
  17. M

    '78 merc 1400 inline blowing rectifiers

    My 1978 mercury 1400 keeps blowing rectifiers...probably explains my tach problems...what should i check for the cause of blowing rectifiers..the internal wiring harness is brand new...should i be looking at the MerControl harness for problems or could one of the ignition components be causing...
  18. M

    '78 mercury 1400 stator testing

    My '78 1400 has a 9 amp stator...it has the two yellow wires with the red srtipe...How do you test these stators? Should i have continuity between either of the yellow wires to ground, or continuity to the frame of the stator? When i check ohms between the two yellow wires i get a reading of .3...
  19. M

    Thunderbolt Tach issues

    I have a '78 1400 on a '75 Glastron...the original thunderbolt tach does not work, it acted like it wanted to...it went to about 500 RPM's and then slowly sank to zero...also, from my observation, the previous owner had the wires on the wrong terminals...maybe the tach quit and they just tried...
  20. M

    prop selection advice

    I have a 1975 Glastron V 178 with a 1978 mercury 1400 inline 6 outboard....im looking for advice about the pitch and diameter....from what i've been studying i believe the pitch im looking for is around 19 to 21...seems the 19 pitch is for up to 125 HP motors though...and im wondering how the...
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