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Forum: Engines & props 28 July 2013, 21:37
Replies: 45
Views: 20,083
Posted By samt
Depends how it's been looked after, abused or...

Depends how it's been looked after, abused or messed with.. I have a 1992 Merc 15 (same as your mariner) ticks over sweeter and smoother than a lot of new four strokes.

As everyone says, simply...
Forum: Engines & props 28 July 2013, 21:24
Replies: 45
Views: 20,083
Posted By samt
I've always ran engines on 50:1 rather than the...

I've always ran engines on 50:1 rather than the stated 100:1 and never had any issues. Maybe a tiny bit more smoke. I believe the RNLI run all their engines on 50:1.
Forum: Engines & props 17 July 2013, 20:45
Replies: 45
Views: 20,083
Posted By samt
No. 25 on the diagram. Some engines have an...

No. 25 on the diagram. Some engines have an airbox with an access hole covered by a plastic cap, some don't. Turn it in till it lightly seats then turn it out 1 1/2 turns.

Carb may need cleaning...
Forum: Engines & props 17 July 2013, 16:31
Replies: 45
Views: 20,083
Posted By samt
Check the idle mixture screw at the font of the...

Check the idle mixture screw at the font of the carb, usually behind a small plastic cap on the airbox. Should be 1-1/2 - 1 3/8 turns out.
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