Ditto: Be careful when buying parts, to get a 200cc you will need at least a 6mm stroked crank with a 62mm bore in which the case will have to be split and bored to give you a 196cc engine. Do just as metalstudman says and if you don't feel it is enough either a ported and polished head with a performance cam, or a 4 valve head will really wake it up. Stay away from cylinders larger than 59mm which claim to be drop in kits for the sleeve is too thin and the engine will not be reliable.
TOM
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