I have a reaction 150 as well that was giving me fits at the end of the season and just this week. now this week it had a load of stale gas--end of season, no, but same problem. flushed the system, clean gas and a spare clean carb. It would still do the same thing, fire up and die.
over and over.
just a quick "burble".
If i held the key switch on it would continue to run in a hit and miss manner--but without any real power. after a lot of continual, near starter cooking cranking it finally started reaching beyond idle revs. got me to thinking it was electrical.
took the keyswitch out of the panel to compare it to another i have, and with it hanging down i tried again.
It fired, and ran normally with it released. likely was some moisture inside. now it fires right off and is fine.
just something easy to check.
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