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  1. M

    silence oil alarm merc xr4 150hp

    how do you silence the oil alarm on merc xr4 150hp already disconnect oil pump and all components pulled sensor from oil resovior apart at ground and just before some black box on port side of engine and same with sensor that went to the oil pump but soon as i start engine alarm goes crazy any...
  2. M

    oil induction removal

    i have a 1991 mercury xr4 150hp was thinking of removing oil induction will it hurt it if i just pull oil line at tank and block it and disconnect oil sensor or is there more involved.
  3. M

    oil resovior in boat cracked or closed?

    i have 1991 mercury xr4 150 and dont know if i should keep the oil resovior cracked like the gas tank lid or if it doesnt need to be vented and if that could make my oil alarm go off
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    merc xr4 surging at WOT

    I have a 1991 mercury xr4 150hp motor a few days ago it started surging at WOT kinda like i was running out of gas but ran fine at 3/4 throttle no problems at idle either. Thought maybe a clogged fuel filter or pinched hose and/or line. couldn't find anything though. This morning it wouldn't...
  5. M

    Where to find pressed in rubber hub?

    I have a mercury quicksilver laser II 48 16994 a40 24p prop it has a pressed in rubber hub that i spun last week. it has already been removed for the life of me i can not find a part number on the old one or find a replacement online does anyone know where to buy a press in hub. ps goes on 1991...
  6. M

    how to tell if i have a bad lowerunit?

    i have a 91 xr4 black max and think the lower unit has gone out it will put about 5mph in forward drive at low rpms and just rev high and go no where when i throttle up
  7. M

    Merc XR4 over revving when throttling up

    I have a 1991 Mercury XR4 i bought about a month ago. Last night after running boat all day I throttled up on motor and had sudden loss of power much like when i had spun a prop in the past I putted back to shore thinking i spun my prop but it was fine. it will engage in drive but wont go over...
  8. M

    timing a 1500 tower of power

    I have a 73 sleekcraft boat and a 75 merc 150hp inline 6. plan on timing and sync it today the manual says to adjust dist at wot but i have no test tank and wot across the water seems to be foolish while trying to tune a motor. can this be done backed in the water on the trailer or with muffs...
  9. M

    Tach wont work

    hey guy I have a 73 sleekcraft and a 75 merc inline 150hp motor. I bought a new tach from autozone and cant get it to work. I tried hooking it up as to manufacturers specs but i get power but with boat on I get no rpms. I also tried a couple places on the switch box the motor manual says is...
  10. M

    what is a good diameter and pitch ffor my motor?

    Currently I have a 1973 17' Sleekcraft with a 1975 merc 1500 inline six. Im not getting the speed or the whole shot I want. Im at 5400rpm wot and have a 17 pitch quicksilver prop 12 1/2 diameter and only running around 36 mph with nothing in boat but two full 6 gallon tanks any suggestions would...
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