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  1. 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...
  2. 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??
  3. 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.
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. Gomer50

    1972 Merc. 80 HP fuel starvation??

    Okay folks I am at the end of the line again,Carbs cleaned,new fuel pump.new fuel hoses,new fuel filter,new fuel tank.Starts fine,Idles okay,good hole shot,but running at WOT for about a minute or 2 it starts to starve for fuel.2 or 3 pumps at the bulb and she will pick back for awhile and then...
  15. Gomer50

    1972 mercury 800 water pump question

    I am a little concerned about a new water pump.I ordered a new complete water pump from iboats and installed it.But before i put the lower unit back on I would like to know is it hard to turn the drive shaft after the new pump is installed.Mine sure is.I didnt wrench it down real hard,it just...
  16. Gomer50

    1972 mercury 800 with early 80's lower unit

    I need a little advise concerning a new water pump I have a 72 80 hp merc with a early 80's 115hp lower unit and I need to purchase a new water pump/complete kit I found 2 but not for sure if these are right.The lower unit is with the tapered bearing style and has the speedometer hose on it.I...
  17. Gomer50

    1972 Mercury 800 Compression??

    Okay,I spent all morning doing the seafoam thing.First compression test (cold) without seafoam soak cylinder 1 125 Psi 2 135 3 135 4 135 after seafoam soak the same.After letting her warm up on Muffs cylinder 1 dropped to 115 Psi rest stayed the same.I am thinking about tearing her apart and...
  18. Gomer50

    1977 mercury 115HP Max Rpm

    I have a friend call me today and ask me about his boat,so I would like to pass this on to you guy's for your opinion..He has a 1977 Merc.115 HP on a 14 1/2 foot Hydro boat weighing about 420 LBS.Also he is running a 13 1/4 by 21 Pitch Prop and he say's his Motor is screaming at 6000 RPM WOT and...
  19. Gomer50

    1971 mercury 800 Distributor needed

    Hello all, I am looking for a used distributor for a 1971 mercury 800 in line 4 that will work for the 332-2986 switchbox? Mine has took a **##..
  20. Gomer50

    1972 mercury 800 timing ??/

    My Motor seems to run pretty good but I am a little concerned with the timing,I have read the link and synch procedure and have read the manual several times and still not sure. Number 1 the only thing on my flywheel as far as markings are 3 dots and if I am doing this right, I used a dial...
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