I would always go for 8:1 pistons to boost economy and get some extra umph.
Iirc during the period the bikes were built they had to run on low octane pool petrol. If they had better fuel I am sure they would have been built with a higher cr in the first place.
If you are unhappy you can always fit decompression plates during the winter. It also gives you the chance to escape for a few hours for a couple of days,iyswim.
Iirc during the period the bikes were built they had to run on low octane pool petrol. If they had better fuel I am sure they would have been built with a higher cr in the first place.
If you are unhappy you can always fit decompression plates during the winter. It also gives you the chance to escape for a few hours for a couple of days,iyswim.