KymcoForum.com
General => Technical | How To => Topic started by: 118118 on February 14, 2018, 03:01:18 PM
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Has anyone ever fitted a Gear up kit to a Kymco. I believe the gears are slightly different to a Chinese GY6 as in shaft sizes.
Does anyone have any details or experience?
Must be someone in the US who knows! ;)
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Yes, I've geared-up 2 Kymcos using gy6 gear kits. One of the stock gears in the set has to be swapped in the standard stock Kymco gear set. The up-gear set is 2 replacement gears, and there's 4 gears in a complete installed set. In the Kymco, one of the 2 remaining Kymco gears has to replaced with a GY6 gear. The Kymco gear appears to be identical to the GY6 gear, but it has a different inside diameter. If your Kymco is fitted with a QMB/GY6 engine instead of the SD10 engine, you can simply swap in the entire GY6 gear set. I figured it out by experimenting using gears from the local GY6 recycling-bin. It's not a big deal since the gears are cheap. Any well-stocked Chinese scooter dealer will have the odd-ball gear in stock, and it's less than $10. Show the mis-fit Kymco gear to the parts man, and they know exactly which gear you need. Both 50cc and 150cc scooters have the same issue.
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Yes, I've geared-up 2 Kymcos using gy6 gear kits. One of the stock gears in the set has to be swapped in the standard stock Kymco gear set. The up-gear set is 2 replacement gears, and there's 4 gears in a complete installed set. In the Kymco, one of the 2 remaining Kymco gears has to replaced with a GY6 gear. The Kymco gear appears to be identical to the GY6 gear, but it has a different inside diameter. If your Kymco is fitted with a QMB/GY6 engine instead of the SD10 engine, you can simply swap in the entire GY6 gear set. I figured it out by experimenting using gears from the local GY6 recycling-bin. It's not a big deal since the gears are cheap. Any well-stocked Chinese scooter dealer will have the odd-ball gear in stock, and it's less than $10. Show the mis-fit Kymco gear to the parts man, and they know exactly which gear you need. Both 50cc and 150cc scooters have the same issue.
Many thanks for your reply. I have seen the exact same photo and this is what i suspected. It's not as simple in the UK getting or swapping gears at your local dealer. I will have to order a set of Gears and then have them machined or sleeved to fit.
What gear ratio did you use (or teeth numbers 15/37 or 18/36) and what was the increase in speed or change? I really want an extra 7 or 8 genuine mph more.
Any details will be very useful before I order from Ali Express.
Many thanks
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It is just about as simple as I have described. All gy6 engines have identical parts, regardless of which of the 100+ manufacturers you choose. That's one of the most amazing benefits of Chinese technology. I hope you don't have to go to the machine shop. The stock gears are easy to find. It might even be cheaper to just buy a scrap Chinese scooter, take the gear set, and recycle the rest. I can't recall the gear teeth count of the new gears, but it's approx 10% speed change. That's not quite what you were looking for, but it's noticeable and fits nicely with a 75cc BBK. It means the upgeared scoot can cruise easily at 60-65kph instead of wheezing along at 50kph.