Road track & Trail has thread on weights in 10 and 14 oz for the MC/DE flywheels. The 14 oz actually wraps around the edge of the flywheel some. This in effect gives a greater increase in MOI over the 10 oz than the 4 oz difference would have you beleive. The weights have a "nut" machined in so its a simply R & R install. No spacer is needed, although its close so I run two ignition gaskets.
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