hello a couple of questions to older members,, i have just bought two 1974 247 engines and one is fitted with a reed valve, it is well made and made to use a amal carb, i have looked online and found reed valve conversions , but these apear as a later mod and use a mikuni carb. has anyone seen one of these or know anything about them.. the second question was do they work??. i have to strip and rebuild the engine is it worth leaving on, i will be using a new amal carb,, thanks for any help,,