potential ignition problems

jrem123

Cadet
Joined
May 31, 2005
Messages
11
Hey to all: I'm a Force user but they all suggested I post here because apparently the engine uses Merc ignition parts.<br /><br />I have a Force 85 hp 1986 that has compression and spark, runs fine at low r's, but won't get up to speed. The power band just fell off the cliff one day while pulling a skiier. The prop isn't spun, has power at the low end, but seems like it's starved for gas when I get on it.<br /><br />The fuel pump diaphram is okay. Pics of the spark plugs are at http://jrem.webhop.org/2686.jpg <br /><br />I'm thinking it's a plugged carb, although I did the seafoam deal trying to clean it out, to no avail. <br /><br />Someone stated that there might be a problem with ignition coils at higher rpms, so I'm asking here if someone can please help.<br /><br />Thanks, John.
 

cistn

Seaman Apprentice
Joined
May 30, 2005
Messages
37
Re: potential ignition problems

hAVE THE STATOR DIAGNOSED
 

Bob H.

Petty Officer 2nd Class
Joined
May 4, 2005
Messages
113
Re: potential ignition problems

Coils usually show signs of cracks on the older engines. Usually rear their head after the engine has warmed up. If it bogs coming out of the hole the carbs are dirty. If Seafoam didn't clean it up you'll need to split the carbs and clean'em good. Removing all of the welsh plugs is the best way to clean them up. You can usually get by without removing the welsh plugs but it's a crap shoot. Coil cracks are usually quite noticeable on the older Mercs and Chryslers.
 
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