July 9, 201313 yr hi whats the best plug and gap for 350t currently got bp6es came with bike but not sure if its right its a 151 model 1975 350 cheers
July 10, 201313 yr Hi davdeborg. The best spark plug is either a NGK BP5ES or a BP6ES so what you have is fine. They seem to like a plug gap of .40 mm which is the same as the points. That is also what Bultaco recommended as well. In imperial measurements that is 15 thou. Graham.
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