Either a 61 or 62mm big bore kit will deffinately compliment your engine if the head was ported and polished correctly. Either 61 or 62mm will require the case to be bored oversize. A 59mm kit will drop right in. Caution if there even still around is the 61mm drop in kit which does not need the case bored. These cylinders have had the sleeve cut down to fit the case and is therefore too thin for any reliability and is deemed to end in catastrophic disaster.
TOM
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