GOOFIT Kick Start Idle Shaft Gear 7 Spline for GY6 49cc 50cc QMB139 Motorcycle Scooter ATVs Read description for fitment information Four Stroke Scooters with the QMB139 Engine. 7 Tooth Fit for 4 stroke GY6 49cc 50cc Chinese Made Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)