Does anyone know if a gc8 and bigeye have the same flywheel?

5 speed, yes fairly much.

some flywheels are two piece. i'm not 100% sure where they come into the mix, but either way, they are interchangeable.

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Same same.

I'm running a GC8-spec Fidanza lightened flywheel in my bug, its spot on.

Cheers guys I'll get that bugeye fly wheel then so I have all the parts ready for clutch change

So is it correct to assume the whole 5 speed GD range of clutches and flywheels is compatible with late GC's?

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flywheels yes, clutches no, some are push (later models), others are pull (early models upto 2005)

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Errr think it was a two piece. Oh well seems ok. Clutch feels a lot softer now and it's heavy duty seems a bit odd but holds ok just wanted to make sure it was good for tune.

Any dissadvantage of two piece?

I think the 2 piece flywheels are predominately super light weight, where the center is usually aluminum and the gear is made from a stronger metal so that the starter motor doesn't chew out the teeth in no time. My guess would be that the biggest disadvantage in two piece flywheels is the higher likelihood of the lighter material's tendency to warp when subjected to prolonged heating.

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Omnia dicta fortiora si dicta Latina.