Re: fuel additives?
i usually don't belive in "tune up in a can", but I do use ring free/carbon guard in every two stroke, and I can personally testify to the rewards of running seafoam in a fourstroke engine. Last Yamaha class I was in, the instructer said he ran ring free in every tank, in every vehicle he oowned( of course he gets a discount on it) car, boat, motorcycle, etc. I checked with the auto parts store to price techron( the additive in ringfree and carbon guard), believe it or not, its cheaper from Yamaha or Merc for the concentration levels required. On my last two trips to Fl, I ran seafoam on one trip, and didn't on another, no other changes to the van, picked up 1.5 mpg when running the seafoam. The local water taxi runs ring free in every tank, 3000 hours on a pair of fourstroke 150 Yamahas, no engine issues at all, checked the valve clearnce after a shock treatment, all valves within spec.
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