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most of the hondas have a harmonic balancer in the crank pulley and you risk you engine at higher speeds. i've seen high mileage cars with a crappy idle (shaky) and after they changed the crank pulley (no other work) the idle smothened out considerably. as for the other pulleys i think they are worth if you are looking for eye candy.
and all the f2x series engines habe a balancer shaft rotating clockwise to dampen some of the engine vibration.
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