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Has anyone Experienced any negative results or problems using a lightened flywheel and stage one clutch with heavy duty pressure plate on stock motor 1.7L

 
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there is no reason to use stage 1 without a turbo

 
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what about flywheel? How negative are the effects of it

 
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Agree with sdaidoji on the clutch, stock is fine for a stock engine.
Extra stiff clutch can cause the crank to eat its thrust bearing.

Lighter flywheel: Less stable idle due to less rotational mass, and tendency to set false misfires?
\IDK, no personal experience on this.

FWIW I know an engine builder who chose to use extra heavy flywheel on an engine-----then his air cooled VW Bug would pull the front wheels in the air.

 
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Light flywheel will make you lose torque. No power gains, just rev happier.

Like ezone mentioned, heavier makes torque delivery consistent

 
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I run one, the engine will come up to RPM's easier, help's take of a good bit. I use a stock clutch, have had no issues with it, have a good 2500 laps on it