I've had an intermittant problem last year and this with engine suddenly
running poorly - like no power, pedal to the metal, max. 40
mph. Sometimes it clears up quickly, sometimes not. Sure, I
thought it might be stuck float but problem never lasts long enough to be able
to check. Also, since I put in Mo$$'s Grose jet which they state is a
"superior replacement for original style needle & seat," I figured they
should be infallible. So I check dashpot oil, adjust carbs three
times, replace stock air filters with K&N style to avoid dirty/stuck
carb plungers, set valves twice, new plugs twice, set timing twice, gapped
points, new points, condenser, rotor, & cap. All this over the last
year & problem came back during an 80 mile run over the weekend & would
not go away this time. I thought - are the valves burned?
What is going on here? Carb plungers going up
& down okay. So as engine runs like crap I pull off plug wire #4. I
have spark between the connector & the plug but engine quits. Put it
back on. Start engine back up & pull off plug wire #1 - got spark but
no change in engine rpm. Pulled off wire #2 - got spark but no
change in engine rpm. I had spark but was running on only the two
rear cylinders! Put wires back on, spray gas in front carb &
engine running improves significantly. Front carb is not getting
gas! Take cap off float bowl and cannot blow through float valve
even though large ball in valve is free. Tear that "superior" float
seat assembly apart and there are two steel ball bearings in there - a big
one which is visible and is moved by the float lever, and a smaller ball
bearing you can't see because it is hidden on top of the large one
and seals against the valve seat
when pushed by the bigger ball. That little SOB is stuck solid against
the float seat. Had to knock it out with a nail. Put stock style
float and seat assemblies back in and a drive today showed no problems.
So, beware of Mo$$ P/N 386-390 Grose jets! (I wish I were a
better mechanic!)
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