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  1. #1
    Join Date
    Apr 2011
    Location
    Me: Midlands, Boats: East Coast
    Posts
    347

    Default Mercury 2.2hp two-stroke timing

    Hello all, I have a question regarding a Mercury 2.2hp two-stroke outboard which will not start.
    The spark is good, fuel is flowing ok and the carburettor is clean. However it refuses to start, just occasionally kicking back and trying to pull the pull start handle out of my hand.
    Looking at the points the gap measures right, but when probing through the spark plug hole it seems like the points start to open just after bottom dead centre which is not what I expected at all! So far as I know the points gap is the only timing adjustment-is that right? If so, what am I missing .......

    Thanks in advance
    Brian
    PS the last ditch backup Seagull Featherweight which hasn't been used for two years and has three year old fuel in it started second pull.
    De'il ding a divot auf yer wame wi a flaughter spade

  2. #2
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,625

    Default Re: Mercury 2.2hp two-stroke timing

    The first thing I always do is chuck a few mls of 2T mixture into the air intake and pull the cord.

    If the engine starts and then stops after a few seconds, you will know it's a fuel issue. If it doesn't fire at all, you will know that it's electrical.

    Richard

  3. #3
    Join Date
    Feb 2011
    Location
    Sussex
    Posts
    343

    Default Re: Mercury 2.2hp two-stroke timing

    Quote Originally Posted by RichardS View Post
    The first thing I always do is chuck a few mls of 2T mixture into the air intake and pull the cord.

    If the engine starts and then stops after a few seconds, you will know it's a fuel issue. If it doesn't fire at all, you will know that it's electrical.

    Richard
    What's 2T mixture? Thanks

  4. #4
    Join Date
    Jul 2007
    Posts
    8,294

    Default Re: Mercury 2.2hp two-stroke timing

    2T= 2 'temps' or 2 stroke!

  5. #5
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    18,625

    Default Re: Mercury 2.2hp two-stroke timing

    Quote Originally Posted by No Regrets View Post
    2T= 2 'temps' or 2 stroke!
    Yes, sorry two-stroke mixture so the same petrol/oil stuff that you put in the tank.

    Richard

  6. #6
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,182

    Default Re: Mercury 2.2hp two-stroke timing

    Quote Originally Posted by Rum Run View Post
    Hello all, I have a question regarding a Mercury 2.2hp two-stroke outboard which will not start.
    The spark is good, fuel is flowing ok and the carburettor is clean. However it refuses to start, just occasionally kicking back and trying to pull the pull start handle out of my hand.
    Looking at the points the gap measures right, but when probing through the spark plug hole it seems like the points start to open just after bottom dead centre which is not what I expected at all! So far as I know the points gap is the only timing adjustment-is that right? If so, what am I missing .......

    Thanks in advance
    Brian
    No I d expect the points to just "break" a few degrees before TDC, but I dont off hand know the exact figure. (5 degrees , or something like that probably)

    Are you sure the gap is correct ... the specified gap should be set when the points are at their widest open point.

    If the timing is that far adrift it is possible that the flywheel has sheared its key and moved on the crankshaft taper. This can happen if the retaining nut is not tightened to the correct torque.

    Have you checked for a good healthy spark? It should jump at least 5mm.

  7. #7
    Join Date
    Apr 2011
    Location
    Me: Midlands, Boats: East Coast
    Posts
    347

    Default Re: Mercury 2.2hp two-stroke timing

    Quote Originally Posted by VicS View Post
    No I d expect the points to just "break" a few degrees before TDC, but I dont off hand know the exact figure. (5 degrees , or something like that probably)

    Are you sure the gap is correct ... the specified gap should be set when the points are at their widest open point.

    If the timing is that far adrift it is possible that the flywheel has sheared its key and moved on the crankshaft taper. This can happen if the retaining nut is not tightened to the correct torque.

    Have you checked for a good healthy spark? It should jump at least 5mm.
    Thank you VicS, the flywheel has shifted on the crankshaft and mangled the key.
    I can't see how it moved though, as it took an impact gun and a mackled copy of the proper flywheel holding tool to get the nut undone.
    Just waiting for a new woodruff key to reassemble and try again.

    Cheers
    Last edited by Rum Run; 23-03-19 at 18:44.
    De'il ding a divot auf yer wame wi a flaughter spade

  8. #8
    Join Date
    Jul 2002
    Location
    Home: Kent. Boat: Chichester
    Posts
    43,182

    Default Re: Mercury 2.2hp two-stroke timing

    Quote Originally Posted by Rum Run View Post
    Thank you VicS, the flywheel has shifted on the crankshaft. I can't see how though, it took an impact gun and a mackled copy of the proper flywheel holding tool to get the nut undone.
    Just waiting for a new woodruff key to reassemble and try again.

    Cheers
    Clean off any burs from around the keyways tighten the nut to the specified torque* so that the drive is transmitted via the taper, not by the key

    * 41 Nm or 30 ft.lbs

  9. #9
    Join Date
    Dec 2007
    Location
    S.W. France
    Posts
    7,338

    Default Re: Mercury 2.2hp two-stroke timing

    Vic beat me to it, same prob with a friend's B&S lawn mower. Sheared key.

  10. #10
    Join Date
    Apr 2011
    Location
    Me: Midlands, Boats: East Coast
    Posts
    347

    Default Re: Mercury 2.2hp two-stroke timing

    Well I replaced the woodruff key and it now starts, and runs for a short while.
    There is steam / smoke coming out of the piddle hole so I took the head off. There is some evidence of blowing by the gasket, and I'm fairly sure that I have had the head off years ago but didn't replace the gasket at that point. Should I replace as a matter of course or will reassembling with RTV or similar do?
    Additionally, the head bolts were pretty corroded, is there a magic goop to slap on the new ones and would replacement with A4 stainless be a good move?
    Thanks in advance (again)
    De'il ding a divot auf yer wame wi a flaughter spade

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