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Old 31-12-2018, 05:58   #46
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Join Date: Dec 2010
Location: W Carib
Boat: Wildcat 35, Hobie 33
Posts: 12,181
Re: mercury outboard wont start

Quote:
Originally Posted by Buzzman View Post
Can't believe no-one suggested checking the plug gap.....and grounding against block while turning over to check for spark.

Air. Fuel. Spark.

Not rocket science.
Suck, squeeze, bang, blow...that's what makes the engine go!
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Old 10-01-2019, 04:53   #47
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Re: mercury outboard wont start

Mercury 15 hp 2 stroke 1995. Ran well on test two days ago on mixture of old (2017) and less old fuel (premium and stabilised). Today would not idle but was able to run for 45 minutes at cruising revs to get where I wanted to be. Removed low speed mixture screw (with concentric spring) and hosed out threaded recess and associated very small airways with aerosol carburettor cleaner. Replaced low speed mixture screw. Screwed in firm but not tight then backed out 1.5 turns. Motor idled fine - job done.
I hate stripping the carbie. The choke assembly is always difficult to refit. The above was done, pitching in a dinghy, swinging on a mooring. The low speed mixture screw is brass and about 40 mm long. Its size and the fact that the concentric spring is a firm fit on the screw reduces the risk of losing it overboard. Final tuning will be done when calm.
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