Hoca Gear Set 18*46 (139QMB)
Description: Hoca Gear Set 18*46 for 139QMB 49/50cc 4-stroke engines. The final drive ratio is the last bit of gearing between your transmission and the driven wheels. In general, a lower final drive ratio will lead to less torque at the wheels but higher top speed. Meanwhile, a higher ratio will result in the opposite, i.e. more torque at the wheels but lower top speed. Get the most out of your big bore kit, with increased top speed and a more usable rev range performance. Hoca Gear Set 46/18 = ratio 2.555:1 is best for stock/mild 70-90cc builds. We suggest going to this 18/46 taller gear set if you planning on plain road top-speed riding.
Here's how to calculate the gear ratio for Hoca Gear Set 18*46 Just divide the number of final drive gear teeth 46 by the number of the counter shaft teeth 18. It's 46 / 18 = 2.555:1 gear ratio. This means the 18-teeth counter shaft gear takes 2.625 full-turns to drive 1 full-turn the larger 46-teeth drive gear. Overall it will take less counter shaft gear turn for the rear wheel to spin compared to the stock gear ratio. Now you know. Get the most out of your big bore kit, with increased top speed and a more usable rev range performance with the right transmission gear set changed by Hoca.
NOTE: Not included, must reuse stock 52-teeth counter shaft gear or purchase Part# 1100-1322. A 12-ton hydraulic compressor is required for removing the stock 52-teeth counter shaft gear off its 15-teeth counter shaft and then re-pressing the stock 52-teeth counter shaft gear onto the new Hoca 18-teeth counter shaft. Please compare OE dimension before ordering to assure correct fitment.
Include the following Transmission gear set.
• 1x Front Counter Shaft Teeth: 18 / Splines L: 24mm / OD: 27mm / Overall L: 56.7mm
• Gear Press-On Area L: mm x OD: 19.1mm / Ends L: mm x OD: 12mm
• 1x Rear Final Drive Gear Teeth: 46 / Inner Spline: 19
• OD: 80.9mm / ID: 18mm / W: 15.5mm
• Made in Taiwan
• Fit QMB 49/50cc
Supported Models: Naraku CVT Kit (Part# KIT.A.139QMB); 139QMB 49cc-50cc engines, Baja SC50, Boreem (BMS) 50, Filly 50, Kymco 50, Panterra 50, Qingqi 50, QLink 50, Roketa 50, SUNL 50, SYM 50, Tank 50, TaoTao 50, and virtually any other scooter engine with these measurements.-----
Item Weight & Package Dimensions:
• 1 pound | 6.85" (L) x 4" (W) x 1.43" (H)