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"The idle advance for the original engine is 5° ATDC @ 900rpm. I tried this but I did not like the engine sound so I stopped at this point for now."
What does that mean- what sound was it making, and what did you stop? Compression ratio doesn't affect idle timing much - throttle is almost closed so the effective compression ratio is very very low - and should not give pinging at idle. Make sure your cam timing and base timing are correct? Then look at carb tuning?
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