Hercules GX/GT?

Hello, I have a Hercules GX that's stock except for the P3 manifold, 21mm Dellorto carburetor, and homemade intake manifold. Despite this setup, it doesn't run any faster, just louder. Can anyone tell me what I'm doing wrong?

Mfg, hope for a quick reply.

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wildpark7
1 year ago

Without other cylinders, it will never be.