sthus Spring Loaded Chain Tensioner for 49cc 66cc 80cc 2 Stroke Engine Motorized Bike- Adjustable Guide Wheel Black

Works so much better than the stock one I got with my engine kit. Get this for sure. It fixes tension immediately.

Good product I don’t have a 50cc bike I’m going to use the parts. And make a custom tensioner for my drift trike

Excellent quality and fit, has kept my chain on for many miles. Only issue is bolt and nut that hold arm on loosens up. Needs a longer bolt so a lock washer can be installed. Do not overtighten the chain guide, it will not move and will cause issues with the bearings. Definitely worth the buy and far better quality than the closet door looking hardware that comes standard with the bike engines

Really helps to keep chain in line. Stays on now

The media could not be loaded. No stars for something with no intructions. I’m not even going to look up how to do this. Because it should be able to install with no instructions. But since I have more than 3 bolts that I actually need, I automatically know I’m not installing this same day I received it. Also the bolts do not screw in properly and it’s just too much to do for something that should be as easy as lacing up shoes.

Don't describe it. Very good. The wheel is way too small. They don't give you a measurement

Easy installation and better durability then the original stock chain tensioner.

When I received this item today I got to work on installing it. I was amazed on how good it works. Thank you.