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Old 7 Dec 2010
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XT600E hotter sparkplug

Hey guys!

I'm currently thinking of trying out a hotter sparkplug on my 1990 XT600E..

My carb (mind raptor 660 carb) is a bit on the rich side as I'm getting some black sooth on the sparkplugs.

Putting a new sparkplug every 300km doesn't work for me lol...

So my questions are:

What happens if I put in a hotter sparkplug?
Which precautions should I have and whatelse?

Right now, the weather is crap around here... dense fog, 100% humidity, rain, North winds...

With all these circumstances summed up, my bike is running like crap! lol
I bet it is getting flooded because at any throttle position higher than 1/3 she starts hesitating hard sputtering, etc until I go down to 1/3 of the throttle or less!

Could a hotter sparkplug be a fix in these weather circumstances?

Extra info:
Air temperature outside is now shifting between 15ºC and 19ºC.
Altitude: 0 to 20meters although highest mountain road in the island is around 400meters (which I rarely pass by)

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Old 7 Dec 2010
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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.
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Old 7 Dec 2010
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Originally Posted by Jens Eskildsen View Post
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. .gif" border="0" alt="" title="" smilieid="249" class="inlineimg" />
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.
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