Spark plugs

Posted by gilesorton on Jun 24, 2020; 7:50am
URL: http://silk-motorcycles.221.s1.nabble.com/Spark-plugs-tp5001960.html

There has been a fair bit said about spark plugs in the recent thread but I thought perhaps worth starting a thread specifically on this as I have got myself rather confused.

My Silk (138) has been running very happily on NGK B8 HS. But I need to buy in some spares and what should I go for?

Arthur recommends Champion L4G gold palladium and I could pick up a box of 10 NOS from USA for £70 on eBay (by the time the post and duty is paid) if anyone wanted to share.

But my handbook says Champion L10 (for sustained low speed use) or NGK B8 HC. (How does that differ from NGK B8 HS?)

Is there a definitive view as to best plug to use and where it might be sourced?