Quote:
Originally Posted by Jens Eskildsen
Fic the problems (running rich) with a rejet, instead og trying to "hide" the problems with an other plug.
The mixture will still be as rich as before, you might be able to burn it better, but that really isn't a cure in my mind.  chug.gif" border="0" alt="" title="  chug" smilieid="249" class="inlineimg" />
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A hotter spark plug will be able to cope with an over rich mixture more easily but you may get other problems at constant high rpm as the plug may then burn out. That could be disastrous if you get localised overheating as a result - holed pistons etc. Just to avoid confusion, a 'hot' plug is used with lower cylinder temperatures as it is less likely to get fouled up. A 'cold' plug is used with higher cylinder temperatures such as when you increase the compression ratio.
Jens is right, cure the mixture problem and use the plug type that Yamaha recommend.
Geoff
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