1984 Merc 4cyl/140hp bogs down

bhanson

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Apr 2, 2007
Messages
15
Have read thru the other threads on this topic, so thanks for the insights. To recap, my engine idles/revs great with no load and runs great once it planes out and reaches some RPM, but bogs down badly during holeshot.

I had a good local boat shop do a tune last summer and they also rebuilt the carb. They made a comment about the carb: "that's the best we could do with a kit and next step is a new carb."

Questions based on the other threads:
1) Dirty fuel filters and other non-carb fuel delivery issues: would she still run fine at speed with those problems?
2) "Interrupt/cutoff switch that cuts out 2 cyl when shifting": Is this real? If so, is this just during holeshot or all the time while in gear, which would make it very easy to check out?
3) Dwell/gap/timing should have been set during the tune, right?
4) Does it make sense that a 20+ year old carb would just be worn out beyond rebuilding and need to be replaced?
 

Coors

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Dec 8, 2006
Messages
3,367
Re: 1984 Merc 4cyl/140hp bogs down

Search the threads in here, all questions have been answered.
 

Bondo

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Apr 17, 2002
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70,464
Re: 1984 Merc 4cyl/140hp bogs down

They made a comment about the carb: "that's the best we could do with a kit and next step is a new carb."
4) Does it make sense that a 20+ year old carb would just be worn out beyond rebuilding and need to be replaced?

Ayuh,............ Times Up,..........................

1),... Nope,..... It'd Stumble,+ Sputter,+ Backfire at High Speed....
2),... Nope,...... It Kills the motor of a second,+ allows you to pull it Out of gear.......
3),... Ayuh,..... That's True.......
4),... See Above.............
 

bhanson

Cadet
Joined
Apr 2, 2007
Messages
15
Re: 1984 Merc 4cyl/140hp bogs down

Alrighty then, will shell out for a new carb and report back. Thanks for the insights, as always.
 
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