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350 rpm woes

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wildfrahm

Contributing Member
Good day I am a newbe to this forum and boats, but I am a motor head from way back. I bought a wellcraft 260 aftcabin this summer ( or to the point bartered). after installing a new fuel pump it fires right up and runs great in tub.(i don't really like muffs). Everytime I take it out it will olny tack up to around 1800rpm's. Will run allday like that, dosn't overheat, oil pressure is fine, dosn't spit or sputter.
I have replaced carb, plugs, water pickup, spark plugs, fuel pump filter water seperator fuel lines cleaned pickup in tank, and changed all fluids. paperwork says it is a mercruiser 260R which is a gm motor (5.7) 350. The ignition system has been changed to a dual point distributor set up. The previous owner replaced motor two years ago but is no mechanic ( he did not do swap) He used the boat this year but was burning up coils. I replaced plugs with spares in boat ( have whole bin full of spare parts). Was looking up new wires this morning and lookrd up app. for plugs and found they were for stock app. not points, mabey coil two. so I bought new coil,wires plugs and pvc filters.
I no this a lot of BS BUT COULD THAT BE PART OF PROBLEM. i LiKE TO READ AN DO RESHERSE. hAVE READ(Ops) all I can find on low Rpm's. and am aware of most. any help would be most appreciated. and also I posted a simaler question on omc page by mistake but motors thge same. and is my outdrive a alpha one or what.
 
Omc and merc are not the same. Omc used point ignitons for years after merc went to electronic.

You have two choices. Buy a marine all in one electronic ignition or replace it with a mercruiser factory system

what year is the boat?

Also running a dual point automotive dist is a no no in a boat.

The reason the coils are burning up is merc electronic ignition coil has a internal resistor and if the coil bieng used Is a point coil (external resistor) . Merc supplies a full 12 volts to the coil.

Most likely you are not getting full timing advance for some reason with that distributor.
 
That sounds good to me. distributor has been suspect science day one, have replaced everything to match points system,coil plugs resister( external)., but there literly is no advance on this distributor I am not a chevy man but i suspect someone took out the mechanical advance and mounted points to distributor base ( that is where they are mounted)
Oh yea the boat is a 1984. I have two factory electronic distributors,coils bot no amps.( I hade a bayline with two 350's Iwas planning on rebuilding last year but got rid of boat). have both old motors intact but i guess the amps were mounted on the hull becuase they are not there. Checked Yesterday. Was planning on getting new dist. but have not decided which i want to go with points or electronic.
Have seen a system cald hot shot that is a replacement for points not sure about that either.
What ever way I go i am wating for a new credit card to come, I lost my wallet last weekend. no one wants to take checks.
i was hopping could find some thing else. replaced wires,coil and plugs today it made a neglagable diffrence.
 
was reading other posts and saw something that made me think. my coil get really hot. after sure if it still does it with the new distributor. wouldn't that be from primary ignition sircuit some where.
 
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