Spring Loaded Chain Tensioner,2 Stroke Motorized Bicycle Chain Guide

Do yourself a favor and a favor for your loved ones. Change out the stock tensioner asap! Ask what happens when a stock tensioner fails and you'll understand. Great product and have used 1 on every build

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.

All in all this is a great product and I do recommend it from the stock chain tensioner that comes with your motorized engine bike kit. I do wish the spring had more tension to it and that the screws/bolts weren’t made of aluminum because I have had one snap on me. Also for those who have higher cc engines or torque make sure your chain is tight before installation because when you do engage your clutch even slowly at high speeds the bottom of the Chain fully pulls on the tension wheel and if the chain is not tight enough will cause slack in the upper part of chain and cause your chain to lock up in your housing and will bring your tires to a dead stop or if your lucky will break your chain either way it would not be safe or fun The installation process is very simple even though it doesn’t come with any instructions it goes as follows: Step 1 The set up process is very simple I have found it easier to connect one side of the spring to the curved side of the mounting plate where the 2 small holes are (The top hole would have more tension then the bottom one) Step 2 Out of the 5 screws/bolts and 2 locking nuts and 2 washers that come with the tensioner use ONLY the small screw/bolt and locking nut to attach the tensioner arm to the mounting plate Step 3 Remove original screw from the housing cover and place tensioner plate over housing cover and use the 3 Similar screws/bolts to mount the tensioner plate on top of the housing cover and tighten in new screws Step 4 Take the biggest screw/bolt and add 1 washer then the chain tensioner wheel then the other washer then locking nut to any of the 4 large holes on the tensioner arm (IMPORTANT MAKE SURE THERE IS A WASHER ON BOTH SIDES ON THE TENSIONER WHEEL) Step 4 Connect spring from tensioner plate to tensioner arm

Must have, way more reliable than tensioner provided w / kit

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

Works as it should excellent would buy again

I never leave reviews. This is well deserved, bolts shown are Allen head, nuts shown are nylon lock nuts, what came is junk hex heads with regular nuts, the bolt that holds the wheel doesn’t even fit in the holes on the bracket. Spend the extra few dollars and a better brand

Adjustable tension and good placement make this a worthy alternative to the factory tensioners for 2 stroke bicycle kits. Make sure to use plenty of light grease. After a few years and hundreds of miles the bearing hasn't shown very much wear at all. Some side play but not a huge deal

Packaged very good looks to be good quality

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.

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!

Love the idea, hate that I can't make it work.

Not a good setup, when trying to start the bike the torque on the chain is opposite of tension side causing the chain to slack and bind up solid in housing. I had to remove this and go with standard tensioner that came with the kit. So this is useless to me not.