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

Works as it should excellent would buy again

Works great I use them on my gas bike motors on every build these things connect to the engine and keep the slack on the chain tight self-adjusting spring loaded I love it

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

Much better than the original chain tensioner.

Spring broke second week I had it on the bike so I made a new spring and working well now

This is a great tensioner. I would have liked instructions with the unit but the advertisement shows pictures of proper installation. I recommend to add lock nuts and luberican to the tensioner wheel to keep it able to move freely and also on the pivot bolt and nut with washer and lock washer to give it ability to move as needed.

The screw of the wheel that guides the chain is too long for a pedal 2 stroke engine it sticks out so far you can't even pedal with it installed would work if you had a pull start motor but not a pedal start motor unless you have a grinder to tapper the extra screw that stops the pedal from moving forward filling it down I did that and the bolt that connects the arm to the mount is super lose even with the spring installed on the highest one it still drops and creats slack enough to throw the chain completely off the guide your better off with the old school chain pully that connects on bottom of the frame.

Excellent

I struggled with many chain tensioners thinking ok i got it this time...? Dont kid yourself.. spring-loaded tensioners are the best solution for sure! The one thing I needed to do.. I grinded the bolt heads down about half.. so crank peddle can pass freely.. Use double nuts on the bolt harnessing flex part, to lock tight but still loose enough for tensioner to flex.. Thats it.. Works great!

everything fits good. my only problem is the cheap hardware. 1 bolt the threads all stripped off, and also the heads catch on my pedals. so i have to go to the hardware store and look for a couple better bolts. not a big issue. also the plastic roller wheel seems rather cheap, not sure how long its gonna hold up. for the price i guess it was worth it.

Works great keeps just the right amount of tension on the chain!

Packaged very good looks to be good quality

The bolts in the pictures are not the ones provided for mounting to the engine. They didn’t fit the mounting holes of the bracket so I had to drill them out to fit. I need to shorten my chain but it works a lot better than the one from the kit. Used on a pacific coast chopper/schwinn stingray