you should never ever lug an engine at really low rpm. even a cruiser bike has a powerband, so keep the revs up in there and not at "idle rpm". one reason is to make sure that the engine is making usable power in case you need to make a sudden emergency move. other reason is that lugging an engine can twist (and damage) a crankshaft - it's being overloaded.
now, if you LIKE breaking parts, go right ahead...
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