Lambretta Forum

Lambretta plug half black, half metal.

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Dale66 Dale Booth
Pretot, Normandie, France   FRA
Hi All
I am running in a completely rebuilt Lambretta engine. The running has become lumpy, which I thought might be jets but when I take the spark plug out, half of it is black and oily and half of it is clean metal. Any ideas what this could be?

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