Recent content by smike26

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    tach wiring

    Ok you guys are the quickest way to solve this:<br />Original tach on a 78 115hp merc.<br />On the tach, light blue,black, gray and red<br />on the shift box green black and white.<br />Pleade advise what wires go where.<br />Red is probably light on display.<br />Black ground....<br...
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    tach wiring

    Installing original tach. From shift box i have black white and green. At tach I have blue gray red and black. Please advise how to hook up.<br />78 Merc<br />Thunderbolt ignition<br />115hp inline 6
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    78 merc 115 troubleshootin

    I'm suspicious of an ignition problem with my 115hp 78 Merc. What are some tell-tale signs that I'm not firing on all cylinders? When I adjust mixture on all three carbs I get noticable results. After a day on the lake I pull the plugs and they all look the same. Motor starts and runs fine but...
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    spark

    I have a 1978 115 hp Merc that seems to run fine, but I'm not getting optimum speed. It starts fine, idles fine, WOT rpm is 5500. I checked compression and it's low but even. I'm new to this so maybe I screwed that up, I checked compression cold-should i do this while motor is warm? When I...
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    increasing top speed

    I have a 16ft Glastron Carlsong '78 with a 115hp Merc. I have read of people getting 60mph+ with this configuration, I only get about 35mph. What are some methods for increasing my top end. My prop is pitched correctly but needs to be replaced do to wear. I run premium fuel at 50:1. Motor seems...
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    Prop removal

    What's the best way to remove a prop that is frozen to the shaft? Manual says to heat it until the hub melts. Is there something I should try first?
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    Loss of power at WOT

    My 79 Merc 115 sat for two months since last outing and started stalling at full throttle. Last time I had it out it ran like a champ. Could my fuel have soured in that short of time. It runs fine in all throttle positions except for wide open. Any suggestions...
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    merc compression

    Just did a compression test on my 79 merc 115. #1-78, #2-80, #3-80, #4 -80,#5-80, #6-85psi. The manual doesn't say anything about bringing the motor to operating temp so I didn't but some other posts say you should. Who's right. Also what is the standard deviance in compression that is...
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    idle problems

    My 79 merc 1150 runs great at full throttle but idles like crap. It idled perfectly until I changed plugs from NGK to Champion. I put the old plugs back in (not fouled) with the same result. It starts up very easily and idles ok until I open it up then pull back to neutral, then it immediately...
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    metal in lower unit

    When I drained the oil in my lower unit the magnetic drain plug had a small amount of very fine metal shavings attached to it. Is this cause for concern or normal wear and tear. 79 Merc I6...
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    metal in lower unit

    When I drained the oil in my lower unit the magnetic drain plug had a small amount of very fine metal shavings attached to it. Is this cause for concern or normal wear and tear. 79 Merc I6...
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    Merc 115 tune-up

    My 79 Merc 115 Inline 6 runs great at full throttle but does not want to idle. As soon as I put it in neutral it dies. I'm going to perform a tune-up, but part of the timing procedure calls for the throttle to be wide open in forward gear. How is this done? Will a big plastic trash can work as...
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    Merc tilt pin

    My 115 Merc has manual tilt/trim. When I bought it, it had no tilt pin for adjustments. When I installed the tilt pin on the first adjustment up from full tilt the boat handled much better at WOT, but the throttle was responding funny and would not go into reverse at all. I found this was...
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    difference in spark plugs

    I took my new boat for the first time, a 16" Glastron w/ '79 Merc 115, and it ran wonderfully. I had just de-carbed it and was planning on changing plugs after I put it under load for awhile per someone's suggestion. On the second trip with new plugs it wouldn't idle (kept cutting out) and...
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    leaning to starboard at WOT

    Took my boat out for the first time this week and was pleasantly surprised at it's performance, except for a couple of things: When I'm wide open, the boat leans toward starboard. Does a "trim tab" adjustment compensate for this? Also, my rpm is just under 5000 at full throttle, I'm thinking...
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