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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Foreign Object
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<blockquote data-quote="nigsey" data-source="post: 176131" data-attributes="member: 4768"><p>I had a peak inside the cylinder bores of my C Rap using my new bore scope and noticed a ‘foreign object’ on the head by the exhaust valve. Using a piece of wire with a dollop of grease on the end I managed to extricate said object through the spark plug hole. The object is metallic and sticks to a magnet, it’s only a couple of millimetres thick and 6 mil long, it snapped in half easily using my finger nails. My first thought is that it could be part of a piston ring, on the camera it looks like there might be some light scoring on the liner but no pitting on the piston or head. The engine has done 14,000 miles since it’s total rebuild (carried out by the previous owner) the engine doesn’t smoke and still has honing marks on the liner, piston is +10</p><p>I guess it would make sense to remove the head and barrel to do a proper inspection but wondering if anyone can suggest where this foreign object may have come from.</p><p>Thank you, Nigel</p></blockquote><p></p>
[QUOTE="nigsey, post: 176131, member: 4768"] I had a peak inside the cylinder bores of my C Rap using my new bore scope and noticed a ‘foreign object’ on the head by the exhaust valve. Using a piece of wire with a dollop of grease on the end I managed to extricate said object through the spark plug hole. The object is metallic and sticks to a magnet, it’s only a couple of millimetres thick and 6 mil long, it snapped in half easily using my finger nails. My first thought is that it could be part of a piston ring, on the camera it looks like there might be some light scoring on the liner but no pitting on the piston or head. The engine has done 14,000 miles since it’s total rebuild (carried out by the previous owner) the engine doesn’t smoke and still has honing marks on the liner, piston is +10 I guess it would make sense to remove the head and barrel to do a proper inspection but wondering if anyone can suggest where this foreign object may have come from. Thank you, Nigel [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Foreign Object
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