OS Speed 21XZ-R Engine
OS Speed 21XZ-R Engine With 21M Slide Carburettor
For those of you looking for truly big power on-road The OS Speed 21XZ-R is a high performance engine designed expressly for 1/8 On-road racing. Based on the Max 21XZ-R, major parts have been refined to have a more powerful potential equal to more expensive specially tuned or modified engines.
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