ffs
there's a difference between a service and getting the fuel mix right, and yes mechanics are useless that's why we have the fix it days
if the mix ain't right he may burn valves, be prone to overheating, maybe even sieze. either way he'll be suffering less performance (at least in the bottom end) until it's all sorted
that said he may get away with it for a year before problems arise that he notices, but trust me i've played with these things and they do make a difference if they aren't right
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