Product Description
Not made in China! Made from High Carbon Steel SAE 1045/49/SCM415. Fits 420 Chain. See picture for exact measurements. Check your current tooth count before ordering. We offer 12 - 17 tooth options with these same measurements as the picture. 12 tooth option will require grinding the keeper plate and hardware to avoid the chain riding up on the hardware. We also offer a modified retainer clip and hardware for use with the 12 tooth sprocket option . Search "retainer" to find the item listed here on Whygostock.Product Videos
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Product Reviews
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Perfect upgrade for Kayo 125 EFI
I want to start by saying, I can't believe they build these Chinese four-wheelers geared so high. It seems like they will barely climb a small incline! After purchasing two Chinese four-wheelers, a Kayo 125 "Bull" and a 125 Predator, I quickly realized that these four wheelers were struggling to navigate our West Virginia hills. Even with fairly light riders! Stumbled onto whygostock.com and threw some research figured out I would try a 420 pitch 12 tooth instead of the original 13 tooth on the front drive gear. Wow what a difference! It came factory with a 42 tooth on the rear and since it's an EFI model it has a wheel speed sensor so I didn't want to mess with the magnetic tone ring on the rear gear. The four-wheeler went from doing almost 40 mi an hour, but needing help to get started on any kind of incline, to having a good bit of takeoff power but topping out only around 26 mph. That is perfect for our young riders! Do yourself a favor and also purchase the retainer kit as these folks have already "pre-ground" The retainer and provided special bolts that you will need to accommodate the smaller gear in reference to where the chain rides. Will definitely purchase from them again especially when I'm in need of chains for these four wheelers! Couldn't be happier!
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12 Tooth Sprocket
Combined with a 42 tooth rear sprocket, new chain, and new retainer clip. My sons four wheeler now is able to climb hills and not power out.
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12t gear
Bought for a Kayo 125 (ATA125-B), worked liked a charm. Little more lower end. It came stock with a 13t. So wasn't much of a change. But part fit perfect. Had to grind down the keeper a little.
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Sprocket
The sprocket fit as described and was a easy mod for the tao toa!
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2020 Tao Boulder 110
Upgraded a Tao 110 Boulder with this front 12T sprocket. Combined with a 42T rear sprocket, the 110 has significant acceleration compared to the stock setup struggled just to get going on flat surfaces. This allows my 7 year old son to take off more smoothly, or accelerate over small inclines. I'm confident that it will allow my son to pull off some decent hill climbs on the trails if he has to. Well worth the price to make the Tao 110 Boulder a better quad. I also purchased the 420 gold chain, and the chain cutter tool for a very simple installation.
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12t Extremely Helpful Upgrade for 110B Atv
Helped give my kids Coolster/110B atv some bottom end. Very high quality part that is night and day better than the OEM.
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Sprocket
This should of come on the bike to start with . Much better all around
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Upgrade spockets
Very fast shipping and very good information. Fast reply most helpful. Good product
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Front sprocket 12 tooth
We put this as well as a 42 tooth rear sprocket on a Kayo Fox 70 to improve starting torque and reduce top end speed. Parts fit well and the results we were looking for are accomplished.
