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The only time I've had a back fire, after miles of great performance on a refreshed 930-10 ('83 euro CIS), was due to an overly lean issue.
I put a bung on my SSI and run an AFR gauge in place of the clock.
Generally, once set, it remains pretty close to initial setting but I have seen it lean out over time.
The gauge lets me catch that and I can adjust mixture anytime...now I know where the op sweet spot is you always know what is being fed.
I also change, tweak, the setting for hot summer/ winter. Beats the hell out of the clock info.
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De Oppresso Liber
Strength and Honor 5th Legion
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