something about the combusion chamber flow patterns with a 'port' type

engine?

Ken Powell

Ken, Yamaha published jetting charts to use with aircraft fuel including

100LL.

In fact they suggested running leaded race gas as well. At least as
late as '93-'94. The PREFERRED fuel was the ELF super zoomie
unleaded. The stuff ws so exotic that casually smelling the fumes
could hurt you!  Bill Jepson

"7" colder plugs when I had

the fouling really bad.  But I also had fouling with the "9" plug

Perry Mick

Are these ND or NGK plugs? If so a LOWER number is HOTTER
Bill Jepson

Try NGK B9EV B9EGV  Gold Iridium or B9EVX Platinum. These are thin wire

center electrode, last 50 to 100hrs on 130 Leaded fuel. B10 are colder for
trailing.
If the wire burns away they still keep going.

Ian (8 bolts) Beadle

 
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