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Message: <blockquote data-quote="Jules" data-source="post: 620240" data-attributes="member: 88">Auto,Each OEM has a plug heat range chart - ranging from hot to cold. You need to select based on their chart. As i recall it, we used the IW31 on the Denso plugs......which is the hottest. This would mean the plug can work consistently at hot temperatures expected in a racing engines.....ie. karts. Lowest I went is 27....which may be required for cooler days. So now you will see why we use car plugs to warm up.....cos our hotter racing plugs foul easily if the engine is slow or we are not revving it at max. We use normal car plugs for that...RM5 a pop.With the above, you will realise that its indeed true that we can damage a kart if its driven too slowly........and that's why the Yamaha KT100 karts for rental is not a good idea. Too many slow driver, shorting out the plugs and then.....kart dies in middle of track, then u all COMPLAIN KART SLOW! but actually driver is slow!  Seen it so so many times..... <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>