RE: Stock Zen G-26M with a WT-275 big bor carb
hello shumzz try to remove the velocity stack as some times the 257 carbs don,t like velocity stacks .one important tip is throw away the champion plug that come with the zen motor and use a ngk plug or a ngk iradium plug .if the 257 carb is fitted the carb mount must be rebbored as this is a bit narrow.
good luck nice boat.