Re: High-octane versus Regular
I don't know sunoco... is it an ethanol blend? I don't run ethanonl blends (like Mohawk gas) in 2 strokes. Ethanol gives their "regular" a 92 octane rating, but the alcohol can cause problems if a 2 stroke is jetted close to the edge.<br /><br />I think our octane ratings are the same up here... 87 is normal, 89 mid, and 92 or so high grade. I burn regular in my stuff, but I don't have the same motor as you, and none of it is tricked out or running overly advanced.<br /><br />I'd run whatever octane the owner's manual calls for and ignore the dealer's advise. <br /><br />I don't know how the coils etc. are laid out in that engine, but you might wanna check that someone didn't switch around some spark plug leads by mistake.<br /><br />Last spring my Dad was having rough idle, backfire etc problems with his I/O... turns out he had switched 2 wires on the distributor when he put a new cap and rotor on.... but probably an easier mistake to make on an I/O than an OB.<br /><br />that's my $.02