Hello,

A few months ago I bought my first 101 Scout. It is a 1930 45 cu in with the Bosch electrical system. When I purchased the bike the engine was only partly complete, so I have disassembled it for inspection and rebuilding.

My biggest problem at the moment is the cylinders. One of them has several scratches in the bore. The scratches are clearly visible and can be felt with a fingernail (see photo). When measuring the ID I got an alarming 74.8 mm (0.07" oversize i think).

Would it be possible to install a sleeve in the cylinder without risking the cylinder foot breaking off, or creating issues such as pre-ignition from the exhaust valve seal? The alternative would of course be to buy new cylinders, but as a Swedish student my wallet suggests that I try other options before buying new ones :)

If new cylinders are the best solution, which ones would you recommend?

Thank you for any advice or recommendations.

Best regards,

Vilmer Berglund