sthus Black Spring Loaded Chain Tensioner For 49cc 66cc 80cc Engine Motorized Bike 2 Stroke Engine

Great product didn’t come with Allen key bolts but that’s not an issue for me they are standard 6mm and bolted right on my 80cc some people with 8mm engine studs and bolts might need to find different hardware to mount it

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

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

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

I'd say the quality of the screws and metal is alright. The parts might come in handy in the future. I may not have set this correctly, so thats possible. My trouble was with the arm twisting. I might have set it too tight. I just can't take that chance of it twisting and failing while riding. Probably fine for people who like these and know more than me about the setup.

Wrong hardware, holes don't fit 1/4 inch bolts (including the ones that come with this junk)If you want to get a chunk of leg ripped out when something goes wrong on your bike, then this is what you want.

Bolt got in way of me pedelonl feel off yesterday day

I recommend this for any engine. Be careful because the spring can pop off if you accidentally kick it and your pant leg can get caught on it