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Tree Monkey 661 - Redbull version!
Tree Monkey 661 - 36" 9pin sprocket Stihl Chain
10pin Sprocket MS661 36" bar - Ported
Mastermind GTG 2018 - 6cube racing - part 2 - John Reilly vs redbull661 , deets066 vs tree monkey
9pin vs 8pin vs 7pin Rim Sprocket Comparison Test Stihl 661
Mastermind "el freako" 661 Max Flow - 36" 9 pin RS
Stihl 084 vs ported 084 - 41" bar
How to remove baffle out of MS661 Muffler
In the eye of the storm
462 vs 661 - stock
May 2017 CT GTG - 41" Long Bar racing
Stihl 440 with 1000+ hrs of run time - schaeffer 7000 32:1
