Recent content by Chris73Cobia

  1. C

    Fuel/Water Separator

    I just got myself a fuel water separator and I'm installing it this weekend. My big question (being there isn't much instructions) do I put the filter before or after the primer ball? Thanks in advance
  2. C

    Mounting a trolling motor?

    I have a 1973 Cobia Trihull and I put a fishing seat up front, and for now I've got a trolling motor mount rigged up, but I really want to do something better. On max power (50 lb thrust) the motor almost pulls itself off the mount. I'm willing to upgrade to a "bow mount" model but I didn't...
  3. C

    1991 (B) 70 HP with a miss or something

    I'm uploading a video so you can see exactly what it's doing. It is about the same in the water and not. You can see in the video it "kicks" intermittently. It seems to smooth out with higher RPM, but at WOT (on the water, not muffs, I know better) it's still audible within the roar. (video...
  4. C

    Refurbing old trailer

    Wife and I have decided to keep our 1973 boat, and in doing so I'd like to put a little work into the trailer. Mainly it has 4 or 5 rubber rollers down the center and two small (2ft length) bunks in the rear, and that is all that holds the boat. I don't feel comfortable driving the boat on...
  5. C

    1991 Force 70 HP lower unit oil change

    I'm trying to change my lower unit oil, as I don't want to go more than 2 seasons w/o doing that. I have the knowledge of which plugs, and how to fill it up, that's the easy part. Getting the darn plugs out is the hard part. It seems even with my biggest screwdriver it just kinda pops out...
  6. C

    1991 Force 70hp dies

    Motor is a revision B 1991 Force 70HP. Recently rebuilt. It's winter time so I'm going to be doing some work fixing up the boat and praying for an early spring. Anyway I've got 4 things that are of concern, in no particular order: 1. The motor stalls in gear at idle sometimes (usually when I'm...
  7. C

    Trim/Torque Tab 1991 70HP ?

    I am looking for the above part, the little fin above the prop that makes the boat go straight. Seems mine just got chewed up on the lake the other day. I'm sure there is a compatible mercury part, so either the part number or what year/HP combo to use to find the mercury part would be great...
  8. C

    Converting Trailer

    Hey everyone, I've got a 73 cobia, and because I bought it in a non-title state I'm going to just have to guess my trailer is a 73. It is a "Gator" which from my research was purchased by Sterling trailers. Anyway, my situation is that the trailer has 4 or 5 5" wide rollers down the spine, 5...
  9. C

    RPM range and Idle speed for 91 force 70

    Okay got deeper into playing with the motor, got the tach installed and working. The motor seems to idle at 900 with no intervention. I think that sounds high, so if someone can tell me where the idle screw is that'd be great, I have a 91 70hp and its the "B" Model, so I have the single large...
  10. C

    Another quick question, 1991 Force 70

    I have another quick question... I've heard ppl having problems getting their motors to start, but mine is odd to me in the fact that it seems to not need choke to start. It was 50 degrees yesterday, I primed it with the bulb, went and started it, second turn of the key. I needed to give it a...
  11. C

    Question about 91 force 70HP.

    I was wondering just a couple of things, as I just picked up my boat from the shop and now have a "new" 1991 Force 70 HP. Anyway, first of all, did this motor come with a "quick disconnect" for the fuel line. I had a JohnnyRude before this and I'm used that that, but this motor doesn't, I...
  12. C

    Composite, Piranha Prop?

    Hi guys, I have a 1973 Cobia Trihull which is getting repowered with a 1991 70hp Force. The motor has an aluminum prop, not quite sure the pitch and all, and of course I cant make any moves in the prop department until i get it on the lake with a tach. What I was wondering has anyone had a...
  13. C

    Carb rebuilt for 1991 70HP

    I just got myself a 1991 Force 70HP put on my boat. It has a "B" model number for the year, I'm not in front of it but I think its 706F91B. I read somewhere here that the 6 means non-power trim, but this unit has power trim. Anyway my big question is where can I get the carb rebuild kit, it...
  14. C

    Differences within model year?

    I'm looking at purchasing a recently rebuilt 1991 Force 70HP. I was wondering if anyone could give me an idea what the differences were between the different model numbers (The one I'm looking at ends in B). Also does anyone know the weight of this motor? I appreciate any help/advice. Chris
  15. C

    Questions from a potential future Force owner...

    Hello, I've got a '73 Cobia Trihull currently with a '77 'Rude 85 that dropped a cylinder. I've got the opportunity to grab a 1991 70HP Force for $1500 from a mechanic I trust who has just redone carbs, impeller and lower unit oil and will give me a 30 day promise of no issues. Besides...
See more
Top