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  1. metriccrescentwrench

    Transom Repair Advise Needed - Getting it Apart

    1981 15 ft Bomber fish-n-ski. I've got the engine pulled, all the rivets out which attach the cap to hull, and everythings ready for the cap removal except for one thing... Thus far I've been unable to seperate the cap from the transom at the splashwell. I've lifted on the splashwell area...
  2. metriccrescentwrench

    Transom repair advise?

    I was getting my boat (1981 15 ft Bomber fish-n-ski) ready to take my son and his buddy skiing when I noticed a loose bracket on the swim ladder. One thing led to another, I saw that some of the fiberglass skin near the top of the transom had a little 'give' to it when I pushed hard on it so I...
  3. metriccrescentwrench

    Jon boat transom repair

    My son's 12 ft jon boat is going to need the transom repaird fairly soon. What should be used, marine plywood, PT plywood, exterior grade plywood with a couple coats of resin? He only uses an electric trolling motor on it, but I would like to get it back in shape to be safe with an outboard...
  4. metriccrescentwrench

    '81 Johnson 90 intermittent power loss

    1981 Johnson 90 HP. This engine runs flawlessly ALMOST all the time. Last compression check: 120 118 115 115. I put new spark plugs in 2 weeks ago. Every so often when going slow (no wake speed) there will be an obvious drop in power (but yet it doesn't really run rough), then when I feed in...
  5. metriccrescentwrench

    Engine Height Question

    I've got a 15 ft fish-n-ski with '81 Johnson 90 HP. At full throttle I'm seeing about 5600 RPM and about 42 mph on my gps. I was always pretty happy with that, but after talking to an acquaintance I'm wondering if that can be improved upon. He's got the same hull as me, only his is an '86...
  6. metriccrescentwrench

    Impeller Replacement '81 90 HP

    1981 90 HP Johnson. I've been looking at the OMC service manual and replacing the impeller looks straightforward enough. Just a couple of questions. The manual calls for the use of OMC Moly Lube, OMC Adhesive "M", and OMC Gasket Sealing Compound. What are the auto parts store equivalents...
  7. metriccrescentwrench

    Overpowered???

    I recently got a heck of a deal on a 12 ft jon boat for my son, wich he uses on our private lake with a trolling moter. Along with everything else the seller threw in a 7.5 hp outboard that needs some work. Once I get the outboard running I'm thinking about letting my son use it on the jon...
  8. metriccrescentwrench

    Strange Tach Readings

    I've got a 1981 Johnson 90 HP. I installed a tach this past spring, and it has consistently shown around 5600 RPM at WOT. My last two or three times on the water it's trying to tell me the engine's turning in excess of 7500 RPM - NO WAY. Engine doesn't seem to be running any different, and I...
  9. metriccrescentwrench

    Manual Needed for 1973 7.5 HP

    I just acquired a 1973 7.5 HP Mercury virtually for free (I bought a pond boat and trolling motor and the outboard got thrown in 'cause it was cluttering up the guy's basement). Feels like it's got good compression, I was told it last ran 5 years ago but now won't start. So I'm thinking carb...
  10. metriccrescentwrench

    Used board for beginner?

    My son is 14, about 140 lbs, and very athletic. He learned to ski this summer, has been learning some tricks on a knee board, and now wants to try his hand at wake-boarding. What should I look for in a beginner's board for him? (We're going the craigslist route, NOT going to spend the $$$ for...
  11. metriccrescentwrench

    Boat Storage - Outboard Up or Down

    Unfortunately my boat has to be stored outside (my wife actually offered her half of the garage BUT that would entail an unspoken but nevertheless real very high cost down the road :rolleyes:) It's an outboard fish-n-ski, 27 years old, and not worth a ton of money. However it floats, it's paid...
  12. metriccrescentwrench

    Son's First Time

    My 14 year old son went skiing for his first time today, got up on his 3rd try, and as the day went by he just got better and better. The really cool part is that I've never been on water skis (once upon a time I was pretty good on snow skis, but I don't believe there's much in common) so he...
  13. metriccrescentwrench

    Lowrance data card compatability

    Anybody know if the "fishing hot spots" or any of the other map cards will work in a Lowrance Airmap 500 aviation handheld gps? thanks
  14. metriccrescentwrench

    Stainless Prop worth it (for my boat)?

    1981 Johnson 90 HP pushing a 15 ft fish-n-ski of the same vintage. Typical loaded weight is around 1300 pounds. Current prop is aluminum 13.25 x 17, don't know the manufacturer (might be the original 'factory' prop). At WOT I get 43 mph at 5600 RPM, and it's got a good hole-shot. While I...
  15. metriccrescentwrench

    Lower unit drain plug seals

    1981 Johnson 90. Bought new seals for my lower unit drain plugs from OMC dealer with part numbers I had looked up on the BRP website. Seal for top plug looks right, the one that came off was black material, new one looks to be nylon. Bottom one is definitely wrong, they sold me an O-ring...
  16. metriccrescentwrench

    Tach Troubleshooting

    Bought a tach on ebay a little while ago but it won't work in my boat. I've got a 1981 Johnson 90 HP, by the way. First off, I did have a bad rectifier but that has been replaced and I'm now getting around 14.8 volts. I connected the tach to a signal generator and found that it will work...
  17. metriccrescentwrench

    fuel filter fititng install for dummies

    OK, this is one of those kind of embarassing / stupid things that I kind of hate to admit to. I'm more of an electrical / electronics type, and am merely adequate when it comes to plumbing (especially fuel system plumbing). [I'm apparently not very good at typing thread titles either :) ]...
  18. metriccrescentwrench

    Shop Manual ???

    1981 90 HP Johnson. I've bought one of those generic manuals and it leaves a lot to be desired. The only shop manual I could find for my engine was $90. Since I'm kind of cheap (well, very cheap), would a shop manual for a 1987 90 HP be close enough? (I found one for about $40). thanks.
  19. metriccrescentwrench

    Dumb Question - Waxing boat on a trailer

    OK, what do you guys do to wax the bottom of your boats that live on a trailer? In my case it's a 15 ft fish-n-ski, empty weight somewhere around 1100 lbs.
  20. metriccrescentwrench

    transom mounted livewell pump installation

    Previous owner had mounted a livewell pump through the transom and I noticed that he had only sealed it on the INSIDE. Pulled everything apart and found the wood inside the hole to be somewhat wet but still intact. So, after I let everything thoroughly dry what's the proper way to mount the...
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