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Lighter Weights 7-9 grams: More climbing power, but loss of top end speed. Hevier Weights 13-15 grams: More top speed, but serious loss of low end power, or hill climbing ability. The weights fit the motor pictured above.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.