Review on 🛵 Glixal ATKS-03903 High Performance Racing Torque Spring for Chinese Scooter GY6 50cc-100cc 139QMB Engine Moped ATV (Red, 2000RPM) by Reid Rickerson

The product was in good condition and everything in the picture. I installed BBK and added 6-1/2 pulley weights. I then rode the scooter and it was fast with good mid to high grip. I wanted to improve performance so I got this 1500rpm spring. I installed it, tested it and lost performance when switching. You'd have to turn a lot more before it all moved, and all top speeds were the same. When the engine and transmission are heavily loaded, the engine temperature has risen sharply due to more intensive work and the clutch belt and pulley also become hot. I can't say anything bad about the spring itself, it simply didn't serve my "little" scooter. Maybe on a bigger mop like a 150cc. BBC.