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sthus

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

    • Based on 2,160 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Wednesday, Jun 5
Order within 14 hours and 41 minutes
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Features

  • Chain Tensioner Spring Loaded For 49cc 66cc 80cc Engine Motorized Bike
  • Package Include: 1 x Chain Tensioner Kit
  • 49cc 66cc 80cc bike chain tensioner
  • Motorized Bike Chain Tensioner

Brand: sthus


Material: Stainless Steel


Strand Type: Single


Manufacturer: ‎sthus


Brand: ‎sthus


Item Weight: ‎10.6 ounces


Package Dimensions: ‎4.41 x 3.9 x 2.05 inches


Item model number: ‎AMWZ_MZ0052-1


Manufacturer Part Number: ‎AMWZ_MZ0052-1


Date First Available: February 20, 2019


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jun 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • Works great.
A must-have for any motorbike install. Do not miss with the stock chain adjusters included in the kit. This saves so much headache and no need for periodic adjustments. I will never build another motorbike without ordering one of these!
Reviewed in the United States on October 13, 2023 by Turd Ferguson
    • fair
the lock nuts did not last but the rest was really good
Reviewed in the United States on October 26, 2023 by Bryan
    • Great product
there are better out there but not for the price, and for an extra 10 bucks you can make it just as good as the better ones
Reviewed in the United States on November 21, 2023 by D
    • A must have.
Installed on 80cc bicycle, much more of a product that should have come with the engine kit. Works great no need to worry about chain being to loose or to tight.
Reviewed in the United States on October 7, 2023 by BCon
    • It works
The product is easy to install but wants to vibrate loose so lock tight is recommended. Other than that it keeps my chain tight on a consistent basis but definitely keep an eye on those nuts and bolts
Reviewed in the United States on May 31, 2023 by Anthony Spinelli
    • Most important upgrade to any gas bike build.
I'm an experienced bike enthusiast and have built multiple gas engine bicycles. This product is always my 1st and most important upgrade to any gas bike setup. It keeps constant tension on your chain without fail if setup is done properly. It's important toTake time and care when tightening the nut that hold the swing arm to the main body of the part and also the nut and bolt that run through the idler wheel. You want as little slop or play as possible but make sure that they move and spin freely. Gas engine bicycles can travel 30+ mph. Chain failure at those speeds could be very dangerous. I trust this part on all of my bikes. Take your time with setup and enjoy. ... show more
Reviewed in the United States on January 25, 2023 by Blake Hankins
    • You have to put it on a 2 stroke motor
I haven't been able getj one on anything but two stroke moto bad luck with these motors. I though theCheck the sizes. These were for a little girls sneakers and they didn't even make it to the top of the leaving holes Check the sizes. These were for a little girls sneakers and they didn't even make it to the top of the leaving holes stopped Aww ... show more
Reviewed in the United States on July 22, 2023 by John Hicks
    • Review, important need to knows, installation guide
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 ... show more
Reviewed in the United States on January 28, 2020 by Jaadir p.

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