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For people who were around British motorcycle in the 1960s, a lot of things do not present real problems. Read Phil Irving's book 'tuning for speed'. One thing I would say - if you are fitting a vertical twin motor into a featherbed frame, the wheel size determines where the motor needs to be. If you are building a Domiracer type bike which has 19 inch wheels, the motor needs to be as far forward as possible. If you must have 18 inch wheels - the motor an inch further back might be better. The latter handles pleasantly , but cannot be as fast in corners with a lighter front. With 18 inch wheels and the motor forward, the bike can be tiring to ride, even if it corners better.A 500cc Domiracer with 19 inch wheels should be a real goer - with 750cc, even better. I wish I had thought about it in 1966
For people who were around British motorcycle in the 1960s, a lot of things do not present real problems. Read Phil Irving's book 'tuning for speed'. One thing I would say - if you are fitting a vertical twin motor into a featherbed frame, the wheel size determines where the motor needs to be. If you are building a Domiracer type bike which has 19 inch wheels, the motor needs to be as far forward as possible. If you must have 18 inch wheels - the motor an inch further back might be better. The latter handles pleasantly , but cannot be as fast in corners with a lighter front. With 18 inch wheels and the motor forward, the bike can be tiring to ride, even if it corners better.
A 500cc Domiracer with 19 inch wheels should be a real goer - with 750cc, even better. I wish I had thought about it in 1966
