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Ossa Gripper Carb

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A friend of mine (no really!) has just bought an Ossa Gripper and is wondering whether there is a better carb to use than the standard Amal. Has anyone successfully fitted a Dellorto or anything else to a Gripper (250) and improved the carburation?

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We were thinking a Dellorto might be the best option, can anyone give an idea of jetting or even a way of estimating a starting position for jetting based on the Amal settings?

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