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Leaking valves have more effect on compression than combustion chamber volume. When all things are ship- shape and upright, compression ratio probably does not matter much. A slight amount of wear in the needle jets can probably slow a motor much more than a slightly lower compression ratio. The two sizes 0.106 and 0.107 in needle jets, when used with quick taper needles with petrol represent a huge difference -the available adjustment is not fine enough. Have a look at the needle jets and needles in VM Mikuni carbs - do you believe the Japanese did not need to do that ?I like Amal carbs, but I would never use their needles, or needle jets.I suggest a standard 850 motor is a quick motor - what holds it back is carburation and it needs a better gearbox to work with. Mk2 amals use the same jets and needles as larger Mikuni carbs, and the available ranges are much better. No British manufacturer would ever tell you that. What they sell does a job, but often not very well.
Leaking valves have more effect on compression than combustion chamber volume. When all things are ship- shape and upright, compression ratio probably does not matter much. A slight amount of wear in the needle jets can probably slow a motor much more than a slightly lower compression ratio. The two sizes 0.106 and 0.107 in needle jets, when used with quick taper needles with petrol represent a huge difference -the available adjustment is not fine enough.
Have a look at the needle jets and needles in VM Mikuni carbs - do you believe the Japanese did not need to do that ?
I like Amal carbs, but I would never use their needles, or needle jets.
I suggest a standard 850 motor is a quick motor - what holds it back is carburation and it needs a better gearbox to work with. Mk2 amals use the same jets and needles as larger Mikuni carbs, and the available ranges are much better. No British manufacturer would ever tell you that. What they sell does a job, but often not very well.
