timing 2000 30 hp Merc?

Cal_MI

Cadet
Joined
Apr 19, 2004
Messages
29
The 1990-2000 manual says there is a timing adjustment screw, but there is not. Timing is apparently by adjusting the length of one or the other arms that reach to the underside of the flywheel. The flywheel sticker says to time it by setting the roller to just touch the cam, but that is a carb throttle plate adjustment, which does not necessarily change timing. I set the carb throttle roller properly in the usual way. How do I check or set proper timing? There are timing marks on the flywheel, but no pointer on the engine. I assume one uses the starter shaft as the timing indicator mark location?

The engine dies when I try to run it below 2000 rpm. Carb has been cleaned and rebuilt. Engine hard to start, often requires a shot of starting fluid. You crank it without fluid and it almost fires. The bendix drops back down because the engine has fired slightly, but the engine does not keep running. Each cylinder sort of half fires once and quits. Compression is 120, new plugs.

I did find a cut in the fuel line where it attaches to the carb so I replaced that section of fuel line.

The manual says the idle screw should be set at 3/4 turn, and that is what I have determined works best on this engine.
 

carholme

Rear Admiral
Joined
Sep 4, 2010
Messages
4,845
Re: timing 2000 30 hp Merc?

What is your engine s/n and I'll send you the proper Merc Manual.

Gerry
 

Cal_MI

Cadet
Joined
Apr 19, 2004
Messages
29
Re: timing 2000 30 hp Merc?

I'll get the s/n.
Found out it will start and run with the idle screw set at 2 turns, not 3/4 turns. Rebuilt the fuel pump. One diaphragm was deteriorated and somewhat porous.
But now it runs on only one cylinder. Gotta tear down the engine and look for bad reed valves or something.
 

Sea Rider

Supreme Mariner
Joined
Sep 20, 2008
Messages
12,345
Re: timing 2000 30 hp Merc?

You are probably out of correct timing adjustment or have ignition coil electric problems, is the 30 a rebadged Tohatsu 30 version, can you post some pics of both interior engine sides ?

Happy Boating
 
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