Reply to thread

Message

<blockquote data-quote="Edward Buck" data-source="post: 34220" data-attributes="member: 6579">Hi, I don't know if anyone can help with this. I have rebuilt a CB750 K1 and it has new spark plugs NGK bought from a UK parts supplier.The bike has run ok after the rebuild but only in the garage. Took it for a short test ride and it died on me very quickly. I suspected fuel starvation.Did all the usual checks etc and spent a whole day trying to figure out what the issue was.Finally as the spark wasn't great at the spark plugs, I fished out the old plugs that came with the bike. Tried them first against the cylinders and found a beautiful bright spark.I fitted all four of the old plugs and the bike started first time and ran well????I have rebuilt a few engines and never heard of a spark plug (4 of them) all going bad at the same time). When I had a closer look the spark seemed to be jumping not from the electrode to the bent bit (earth I suppose) on top but rather from the electrode to the side wall (threaded part) of the plug. It wasn't a great spark either.Anyone ever had this happen??Thanks</blockquote>

[QUOTE="Edward Buck, post: 34220, member: 6579"] Hi, I don't know if anyone can help with this. I have rebuilt a CB750 K1 and it has new spark plugs NGK bought from a UK parts supplier. The bike has run ok after the rebuild but only in the garage. Took it for a short test ride and it died on me very quickly. I suspected fuel starvation. Did all the usual checks etc and spent a whole day trying to figure out what the issue was. Finally as the spark wasn't great at the spark plugs, I fished out the old plugs that came with the bike. Tried them first against the cylinders and found a beautiful bright spark. I fitted all four of the old plugs and the bike started first time and ran well???? I have rebuilt a few engines and never heard of a spark plug (4 of them) all going bad at the same time). When I had a closer look the spark seemed to be jumping not from the electrode to the bent bit (earth I suppose) on top but rather from the electrode to the side wall (threaded part) of the plug. It wasn't a great spark either. Anyone ever had this happen?? Thanks [/QUOTE]

Verification