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It's normal for the enricher to speed up the engine, since it opens valves to add fuel and some additional air into the engine.
Two things have made my 250 take a long time to warm up in the past:
1. The valves were out of adjustment and not fully closing until the engine warmed up.
2. The carbs were not clean.
When those problems were corrected it needed the enricher for starting and maybe one minute of running at most, even in cold weather.
Sta-Bil will not help clean carburetors at all. It just keeps gasoline from going bad as fast as it would without Sta-Bil. It's the additives with PEA like Techron that can actually do a small amount of cleaning. I wouldn't expect them to open a badly clogged passage though.
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