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I think this is an oil-problem. Pistonrings or valveguides worn. So you have to strip the cylinderhead and find the problem. Regards from Switzerland
Here my Thunderbird
Many thanks Baza. I foun in between also the information for champion N3. As I always use NGK an my bikes I will choose the B8ES. Kind regards Romeo
Hello Does anyone know what sparkplug fits the Bonneville 750 Harris from 1986? In the internet I find several ideas: some say NGK B6 others B8....