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  1. Gomer50

    1978 Merc. 90hp fuel pump

    Any of you gentlemen know where I can get on of these???.:eek:
  2. Gomer50

    Mercury inline 6 versa inline 4 ????

    I am fixing to put a 90 hp inline 6 on a 1972 15 foot trihull Starcraft that had a 80 and 85 hp inline motor on it before. The boat is rated for max 85hp.Will the added weight of an inline 6 make any great difference on the transom.I know back in the mid to late 60s Mercury made an 80hp inline 6...
  3. Gomer50

    1978 Mercury 90HP serial number 5033791

    I picked up a 1978 90hp inline 6 for next to nothing (0=$) and it looks good.There are however a few questions I would like to throw out here.With todays gas what should this one be set at for WOT degree wise.Also the switchbox looks to be damaged,is there a difference between 332-2986 inline 4...
  4. Gomer50

    Merc. 1974 85hp serial Nr.3871943 looking for some input????

    I was given a 85hp motor that hasnt run in 5 or 6 years.She spins freely with no plugs in it,but when I put the compression tester on the number 1 plug she has a hard time cranking over.I have put oil in the cylinders spun them around with no spark plugs and she spins like crazy.I put the...
  5. Gomer50

    Removing 1972 Merc.800 with tilt and trim from a 1972 Starcraft?

    When removing the motor is the tilt and trim unit part of actually lifting the engine off the back of the boat.I am pretty sure I need to disconnect the hydrolic cylinders.I havent found any documentation on this.I am asking because I came across another merc 800 without tilt and trim and I just...
  6. Gomer50

    1972 Mercury 80hp ??

    I would like to ask a few questions.I rebuilt my original carbs and reinstalled them and started her up to see how she would run.Started up fine running in a tank. Adjusted the Idle mix screws to 1 1/2 turns out @ approx. 800 rpm.When I shut down the motor the top carb is showing vapor coming...
  7. Gomer50

    72 Merc 80Hp Strange belt timing

    Here's the story I had a bad trigger and got a replacement off of ebay(very good condition).Installed it according to the book (not my first time doing this) and put my original carbs back on after rebuild them. Started right up however she would not idle below 1800 RPM.Check with a timing light...
  8. Gomer50

    1972 Merc.800 Idles at 2000 RPM

    Just got my motor up and running again,did a carb rebuild soaked them in Chem dip for about a week.Nice and clean installed them pumped up the bulb nice and tight no leaks.Had to prime the cylinders with 50:1 mix and she fired right up.But she will idle @ 2000 RPM and the only way I can get any...
  9. Gomer50

    1972 Merc.800 part question

    I just purchased a 1969 distributor in the hopes I could just change out the collar to match my carb setup.Well I was wrong now in order for this distributor to work I need the top carb cluster part number 52518 and this is NLA. anybody have any Idea's where these still can be purchased??
  10. Gomer50

    1970/1972 merc distributor 650/800hp

    Will the distributor off of a 1970 650 inline 4 fit my 1972 800 inline 4 they both have the same switchbox trigger style just dont know if the 70's distributor works for my 72 style carb throttle pickup.
  11. Gomer50

    1972 Distributor/trigger issue defective??

    I have uploaded some pic's in the hopes you pro's here can give me some input.I had my boat out this weekend to give her a good run and here are the results,Idles like its missing, fresh carb job,timed properly,halfway good hole shot,WOT 4800 rpm with a lttle miss.here is the kicker runs for 5...
  12. Gomer50

    1972 Merc. 800 3 dots on flywheel

    I had taken the outer flywheel off not paying to much attention to the 3 dots on the flywheel and where they were in reference to TDC.I have timed it according to the advise I have gotten here for which I am very thankful.I read the manual from time to time and for some reason it tells me to...
  13. Gomer50

    1972 Mercury 800 piston ??

    Due to low compression I would like go ahead and rebuild this motor serial number 3192882.My question is there a difference between low dome pistons and high dome pistons.Or does this only go for the inline 6's not the inline 4's. I was reading somewhere more torque with low dome pistons versa...
  14. Gomer50

    1972 Merc. 800 trigger/Distributor ???

    I took my boat to the lake to cruise around a bit and ran into a problem.The motor runs strong for 3/4 minutes and dies instantly (like somebody just turned off the ignition).So I checked for fuel all good no spark,so I checked voltage on the switchbox all good,coil Ohms out okay all thats left...
  15. Gomer50

    1972 Merc 800 spark plug??

    I know I will probably get bunch of different opinions on these plugs but your expertise is always welcomed.I am currently using NGK BUHW plugs but would like to get a new set due to renewing electrical componets(also still have a slight misfire).So my options are: NGK BUHW Champion L76V...
  16. Gomer50

    Mecury 800 serial 3192882 fuel pump ????

    I have replaced my fuel pump, but looking at maybe replacing the check valves I have noticed the fuel pump kit that fits my application has a couple of extra's (spring.etc).I dont know wether I am missing something here or thats just something that doesnt belong on my type of fuel pump.I added a...
  17. Gomer50

    1972 Merc. 800 spark plug wires

    I am thinking its time for new plug wires??? Today running my boat in the driveway I put a timing light on number one cylinder to check for irregular spark,and as I was looking at the number 1 wire where the clip from the timing light was hanging I could see a spark jumping across to the number...
  18. Gomer50

    1971 Merc.800 any good pointers

    Is there an easy way to see if the bottom crank case seal is still Okay.I would also just out of curiosity like to know if it is normal for these motors to rattle alot (sounds like a bucket of bolts flying around).Dont get me wrong once you give it some fuel it sounds pretty sound.I realize its...
  19. Gomer50

    1972 Merc.800 coil replacement

    Is there an aftermarket coil for these motors.I have seen several coils but am a little hesitant because I know some motors used multiple coils for there design and mine only uses one and didnt want to buy one that cant keep up the juice it needs to fire.I looked at several here at iboats but...
  20. Gomer50

    1972 Merc.800 fuel pump check valves

    Is it possible the fuel pump check valves go bad.I have replaced the fuel pump diaphram,new bulb,new fuel lines,new gas tank,Carbs have been rebuilt several times look newer than new.No leaks that I can tell.At WOT runs okay for awhile then I need to pump the bulb a couple of times and it keeps...
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