easy stuff first… side channel clean-out with carb cleaner… blow dry
with the carb body seperated remove the ls needle and blow carb cleaner in the LS circuit towards the upper LS chamber see in the above pict.
Do this while blocking the side channel with your finger to keep the spray flowing towards the front chamber
at one point you should see that carb cleaner solvent come out of the 3-4 small holes indicationg regulat fuel would flow also.
see minute 16:45 in this video
(1571) 1971 2 hp Johnson Mate – Stalls at WOT – Gets a Carb Clean. – YouTube
If not the holes (chamber)are/is clogged. nothing wrong/difficult with removingt the dime size plug with a pick…. after drilling a small hole in the center …(NOT TO DEEP !!!)
Inspect… clean… blow all the LS circuit route . Install needle but do not close it. spray carb cleaner again up the side channel and it will exit into the chamber via the very small hole in the side wall of the chamber …. blow dry
reinstall a new plug on top and punch the center a bit to expand the perimiter and seal the edges. I apply fingernail polish around the edges to seal it
see videos on a 9.5 carb…not your 2hp but same basic principle see part#1 at 5:10 minutes for the dime size plug process
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