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  1. Q

    Electronic ignition conversion

    This is my first post to this site but I have been a long time reader. My boat has an I/O 1978 120hp MerCrusier (153cc). I ordered an electronic ignition conversion kit with primary coil and distributor. THe new coil has two wires to connect (a purple wire to power and a grey wire to the tach)...
  2. Q

    Vapor lock?

    I have an 120hp MerCrusier on a 19' Chaparral. The engine runs great at any speed except that after I run at WOT for about 15 - 20 mins, it starts to loose RPMs and dies. If I throttle down when it starts to loose power then it will run ok., but if I keep at WOT, it dies. I checked and there is...
  3. Q

    WOT?

    Does anyone know where I could go to find what the WOT range should be on my 1979 19' Chaparral 120hp I/O? I am looking to replace the prop because it is banged up. I have a Clymer manual but that info is not in there....probably b/c it is specific to each boat size/motor setup? Should I try to...
  4. Q

    MasterGuard Hub Kits

    Hello. 1st, I'd like to thank everyone who provides the answers to the questions to these posts. Thanks to you all and a Clymer manual, I have replaced the impeller, rebuilt the carb, and set the timing on my 1979 19'Chapparral in-line 120hp MerCruiser I/O. Now it runs great! Now I am looking to...
  5. Q

    Dumb Question of the Day

    Just bought a used 19'1979 Chapparrall bowrider with 120hp I/0 (I-drive). I pulled the lower unit to replace bad impeller. Noticed that the bottom oil seal on the upper unit (where the drive gear spline goes into the upper unit)was bad. First Question..do I have to pull out upper unit driven...
  6. Q

    Spring detent?

    Please help. I'm in over my head. I recently bought a 1979 19'Chapparral 120hp I/O. The seawater impeller was bad so I dropped the lower unit and replaced it. I noticed that the o-ring on the lower spline was missing but figured that it was stuck in the upper unit and it would re-seat when I...
  7. Q

    Gear Housing Installation

    Please help. I replaced the seawater pickup impeller on my '79 MerCruiser 120hp I/O. BUT, now I can not get my I-Drive gear housing to tighten back up to the drive shaft housing. I can get it close to the point where the water inlet tube is in the water tube guide and the lower and upper shift...
  8. Q

    1979 120hp mercruiser I/O

    I have just purchased a 19' 1979 Chapparral I/O with a 120hp 4-inline Mercruiser. THe boat, hull, trailer, etc. is in pretty good condition. THe engine is only firing on three cylinders but I figured that I got it at a halfway decent price at $1800. I have rebuilt a couple of motors in my time...
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