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    Oil gauge juming around

    Hi everyone, Went out today and the oil pressure gauge started bouncing around, not a lot 5-10 pounds. Question is i can't remember it doing this over the last couple of weeks. I'm sure my sender needs replacing because the pressure starts at 65 then as soon as I put it in gear it runs up to...
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    Charts for boats top speed, estimated

    see these kinds of questions on here and found this. Thought some of you might be interested in it. http://www.go-fast.com/boat_speed_predictions.htm
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    Prop issues

    Took the new to me 89 172 Cobalt out with GPS today(Mercruiser175) and with the 17 degree prop WOT is only 36.3(I would have thought even with that prop it should have been faster(only 2 of us on the boat today) 3000rpm - 17mph - 35% slip 3500rpm - 23mph - 26% slip 4500rpm - 36.3pmh - 7% slip...
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    Throttle spring?

    Hi Guys, Quick question, before I had the mechanic do all the service to the drive and tune-up the engine there was a spring that went from the motor mount(front right) to the throttle(say 3-4 inches long and half an inch wide), it is not there anymore and the engine seems to be running fine...
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    Do I have brakes? If so what do I need to get them working? Pictures

    Hi Guys, This appears to be the original trailer that came with the boat(89 172 Cobalt). It appears to have brakes(not positive) but I have no idea what is needed to get them working. Tow vehicle is a 4runner 4x4 V6 if that helps. Just got the boat and it looks like brakes are the law here...
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    Should I replace Hydrofoil?

    Ok, I've read a lot of the previous post on hydrofoils, but still can't figure out if I should replace mine or leave it off. I'm guessing leave it off, but figured I'd check with the experts:D . 89 17' Cobalt 175hp ,merc I/O - With power trim tabs. The Hydro that came with the boat is...
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    89 Cobalt

    Here's my 89 cobalt 172, 4.3L 175
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    Repair ?

    Having some repair work done on 89 Cobalt 4.3L 175 with Alpha unit and am curious if these prices sound atleast in the ballpark. Replacing with new Bellows - very bad shape shift cable - preventative since we're in there anyways gimble bearing - grumbling when engine running and it grinded when...
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    porp question

    Hello, I have a 89 172 cobalt with a 4.3L mercruiser 175(with I believe an Alpha unit, can not read serial numbers). This boat was only ever used at an elevation of 6500ft with a 17 degree prop, will this allow my rpm's to go up beyond what the manufacture designed it for at an elevation of...
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    Free 1989 Cobalt

    I know by lurking on here :) that most of you like the Cobalts, so I figured I would go ahead and post my new 89 172 Condurre Cobalt with a 205 merc. It's my first boat and it's in near mint condition. Since it was free I won't ask if I got a good deal on it :D!!! We have been around this...
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