I wonder whether or not 7 port cylinders were ever used on Villiers engined bikes back in the day? Today they seem very common, and some trials bikes are even fitted with reed valve conversions!
The 7 port motors seem to run pretty much like a modern twin-shock, and the originals seem to have a lot less go and appear rather lethargic in comparison.
The 7 port motors seem to run pretty much like a modern twin-shock, and the originals seem to have a lot less go and appear rather lethargic in comparison.
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