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    effect of cup and rake on pitch

    15' tri-hull with '78 Merc 800 80hp outboard. Current prop is a Michigan Wheel Vortex 17p. GPS top speed was 40mph. Manual for outboard says '78 had a gear ratio of 2.3:1. WOT 5400rpm. Prop calculator says 5400rpm, 2.3:1 ratio, 17p, .10 slip (assumed), =34 mph at 19p =38 mph The prop is cupped...
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    stator readings (and their effect)?

    '78 Merc 800 80hp. Excellent compression, decarbed, linked and sync'd, runs like a scalded dog at high speed. Crappy hole shot. Tried to adjust idle mixture out 1/4 turn for better hole shot and it dropped the idle to where it won't idle in gear. So, I got out he multimeter to test the trigger...
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    adjusting to improve hole shot

    '78 merc 800 80hp on a 15' tri-hull. Good compression, rebuilt fuel pump, cleaned carbs, de-carbed, link and sync'ed. Running better than ever (5400rpm WOT, smooth as silk) except for hole shot especially when pulling a skier. As per link and sync, I've backed out the idle mixture jets a quarter...
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    '78 merc 800- No 'hole-shot'

    '78 merc 800 80hp ser. #5006860. New fuel pump and recent carb cleaning. Went from having occasional hole shot, to almost never, just bogs and stalls. Usually, if I catch it in time, I can throttle back and very gradually throttle up to about 2200rpm and then it will really go (5300 rpm) I'm...
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    won't keep WOT

    I have a '78 Merc 800 80hp ser. # 5006360. It's mounted on a '69 Glastron 15' open bow tri-hull. When I start from a stand-still sometimes I get a great hole-shot, other times the motor fades out. After I put it back in neutral (restart if it stalls) I can gradually get it up to 2000rpm, then it...
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    prop, and?

    I have a 15' open bow tri-hull which had a '69 Merc 65hp O/B on it. I had a 15 pitch prop and the boat rode great (30 MPH by GPS). I recently put a '78 Merc 80hp on the same boat. First I started with a 19 pitch but couldn't get over 4800 rpm, so I replaced it with a 17 pitch (getting 5200 rpm...
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    '69 v156 sportster vs. '78 v162 futura

    OK, Glastron fans, If faced with the choice between the '69 v156 sportster 15' tri-hull open bow and the '78 v162 futura v-hull closed bow, which would you choose and why? Oh, they would both use a '78 Merc 800 o/b. I have to make this choice because I only (barely) have room for one boat.
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    Hull dilemma

    I'm wracked with indecision regarding hull choice. I have a '69 Glastron 15' open bow tri-hull with an 80hp Merc o/b. I have the opportunity to get a '78 Glastron 16' closed bow v-hull (I'll use the same motor).<br /> Some of the lakes we boat on can get really choppy (as can the bay), so I like...
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    boat cover that works

    Any recommendations for a boat cover (brand or material) that will actual repel the rain? I bought one last summer that was supposed to be water proof (isn't) and is now so brittle, to look at it will tear it. Unfortunately, I have to store my boat outdoors. It's a 15' bow runner. Thanks.
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    plastic sound blanket

    Another question re: '78 800 inline 4. The wraparound portion of the cover that came with this motor has no plastic sound blanket (and appears nebr to have had one). I have a wraparound cover from an earlier model which has an intact plastic sound blanket. Was the '78 800 supposed to have the...
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    controls and wiring harness compatibility

    I'm replacing the '69 650 inline 4 on my boat with a '78 800 inline 4. I'd like to leave the '69 controls on the boat (came with boat and are a perfect fit). The connections for steering are the same, and the ends for trans and throttle are the same. The wiring harness is visually and...
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    starting point

    I have a '69 15' Glastron tri-hull bowrider which had a 65hp Mercury outboard with a 12" x 15p prop and went 30mph (by GPS) with 4 adults. I'm replacing the 65 hp with a '78 80hp Mercury outboard which was on a pontoon boat with a 14.5" x 12p prop (clearly no good for my boat). I'm also...
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    hull types- pros and cons

    I have a late 69 Glastron 15' tri-hull which is great on smooth water, and less great on chop. Are v-hulls significantly better? I'm a fan of old fiberglass boats and have noticed a lot of variation in the older v's (some are deeper, some flatten at the back, etc.). What's the trade-off? There...
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    freshwater clam

    I just recently purchased a '78 Mercury 800 which was stored on a boat in the water (a lake) for most of it's life. As with any new used motor, first thing I set out to do is replace the impeller. When I removed the lower unit, I found a fresh water clam in the cavity near the exhaust!<br /><br...
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    how many poles is my alternator?

    I want to install a tach (which connects to the unrectified side of the alternator)on my '69 650, but to do so, I need to know the number of poles my alternator has (so it reads accurately). I've scoured my manual for this info, but it's nowhere to be found. If this is unavailable or uncertain...
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    can it be possible?

    I ordered a new prop for my 1969 650E (4 cylinder) and when it arrived, it was too small. When I called the prop shop and told them my prop shaft was 15 spline instead of 13 spline (what they gave me) they checked with the manufacturer who insists 15 spline is a Mercruiser I/O prop shaft. Is it...
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    discontinued parts!!!

    I recently discovered that the distributor cap for a 1969 650 (4 cyl., serial # 2606484) is a discontinued part. Are there any aftermarket suppliers I should know about? Is there a compatible distributor from a different model I can retrofit (and get parts!)? I'd hate to think I have to scrap an...
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    '69 Mercury 650 cooling problem

    I have a 69 Merc 650 outboard which I replaced the impeller on, yet I'm not getting any water out of the 'tell-tale' pipe. There is pressure in the form of air coming out (slight). I've only run the motor at low rpm. When using the cups, water is definitely pumping out of the water return holes...
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