For 11 years I pumped the cheapest gas I could by thru my DF250 with little issue but at one time I had coking on the exhaust valves from enough to cause compression variances in a couple of cylinders. After talking with a very good Suzuki mechanic the fix was to just run Lucas fuel treatment and it would clear up... and it did. The other thing he recommended was to run at or near WOT for 3 or 4 full minutes in the channel on the way in. Again, this was very good advice as it actually improved overall performance and a slight oil making problem I saw occasionally.
As Denny said, propping is a big deal with 4 strokes and you need to make sure you are not over propped. At anytime under any load I could at least hit mid operating rpm limits and could hit max on a light load.
Now that I have repowered I have made the move to running rec 90 in the new motor. The manual calls for 89 and prefers no eth so I'm going to follow the rules with this one but I wouldn't be too scared to run less if I ran an additive.
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[b]The Moose is Loose !
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