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Old 25 January 2012, 04:27   #11
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Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,611
!!!!!!!!!!!! BE VERY CAREFUL WHEN MUCKING ABOUT WITH THE TIMING ON A 2-STROKE!!!!!!!

Thanks to the previous owner of my Merc I had a 3 pot rebore & 3 new pistons - if you advance the spark too far, when it starts there ends up being more fuel on the inlet side of the "piston dam" than the exhaust, which means when it sparks the bigger bang occurs on the inlet side and the piston is pushed sideways hard into the edge of the exhaust port..... The rest, as they say, is expensive.

Try the IanM approach first, and unless you really know what you are doing with spark settings, give it to a dealer!

I also guess it's a 2 cyl engine? They are very "lumpy" to pull generally. I manually started a Yam 55 2 cyl. It was like <brick wall> - <weeeee> - <brick wall> - <Wheeee> ... when pulled.
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Old 25 January 2012, 07:14   #12
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Country: UK - England
Town: bicester
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Engine: outboard only
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you will require to check/adjust your timing,
1x timing light
1x rev counter
1x spark checker so you can remove the s/plugs and check the idle timing buy using the pull start
and the w/shop info to tell you what revs the timing should be (ie idle and wide open throttle)
dont just let the ht leads dangle in the air you could damage the stator
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Old 25 January 2012, 15:23   #13
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Length: 4m +
Engine: Mercury
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Im placing my bet on either, HT leads round the wrong way. Or Flywheel Keyway has broken and put the timing well out. See it loads of times on mariner 25's.
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Old 26 January 2012, 16:23   #14
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Make: Bombard Aerotec 380
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Engine: Mariner 25hp
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Guys thanks for all the words of wisedom and help with this Ive decided that its out of my comfort zone and the engine will be going for a check up once Ive raised the cash.

The thought of me damaging the outboard by fiddling with the timing has basicly put the fear of god in me so best to leave it to the experts
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Old 31 January 2012, 14:17   #15
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the definition of an expert is: ex is a has been , and a spurt is a drip under preasure beware of expurts sorry people
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