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Originally Posted by Fifty150hs
Any signs of excess vacuum? Any change in fuel mileage? I'm considering doing this mod myself.
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- Vacuum: a bit more than stock but no big deal.
- Fuel Mileage: I did not measure it before vs after, so idk. But probably better bc engine seems to run better after mod.
@Blackjetvette97: spark plugs, even fouled with oil, can always be cleaned with gasoline. Change them ONLY if the gap is too big or they have accumulated > 80K miles.