Sachs 505a and the athena 80cc reed kit?

Mongo Zero /

Opinions? I know the 505d is the desirable bottom end but I'm working with what I've got. I've heard this kit is a clutch killer too? I have the 70cc Airsal now on a 505a bottom end and the performance is disappointing. Just trying to gain some knowledge on this before I blow up a motor.

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