87 Force 50 model 507X7C

holdem69

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Joined
Mar 26, 2013
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2
Got a deal on the Boat so now hoping the"FORCE" will be with me.
Had this on the water once doing a go through, had an issue that maybe someone can help me with.

Started and ran fine. I had to adjust the engine pitch to get the boat to plane out properly. Right after
this during full throttle operation, the engine started to miss (jerk) intermittently.

Checked fuel bulb(still full, not flat) gradually got worse to where it was missing at slower speeds. (not nearly as bad though)
Got it back to the ramp ok, brought it home, pulled the plugs and very dry. I am used to these chrysler plugs
always being somewhat damp. Did a compression check, both well within range and tolerance between 130 -135 So my Rocket Scientist conclusion is it was somehow starving for fuel.

Checked all fuel system. Fuel pump diaphragm looks fine, fuel screen clean, fuel lines are clean and tight. primer bulb operational
and stays full. Yanked the carb, detected slight leak around fuel bowl, so replaced gaskets and seals of it. Very small
amount of debris in it. Removed and sprayed down all jets as well as valve and seat. All looked good.

Put all together, put the muffs on it and cranked it over. Seems fine. a little rough from the slightly rich idle mixture
Force recommends. Sounds about the same as it did before testing.


Now my question. If this wasn't a piece of garbage in a jet and it does it again at WOT. What am I looking at for troubleshooting? From what I understand this model does not have points but a stator/trigger/rectifier/coil assembly.
Spark is obviously fine in both cylinders, no need to even check.

Anyone have anything on the WOT miss. Appreciate any commentary


Meant to add one other anomaly. When starting the engine and throttling it up in neutral(warm up) if it revs a little too high it seems to run up(Tach up) on its own. I cannot bring it back down to idle and it seems on its own runaway to higher rpm. I turn the key off and pop it started again and its right at perfect idle. this one is strange. anyone? thanks
 
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