Will this work on a go cart?

Depending on the length of the chain an if it will mount to the 2 stroke engine

Replacement wheels come in 8mm&10mm which size do i need for the black Sthus tensioner?

That's an odd question. The standard chain for a bike motor kit is #415 which is 7/16" wide or a little more than 11mm; neither of those sizes would work. If it is a replacement wheel then I would propose measuring the one you have to determine how big it is. If the wheel is actually a sprocket then 8mm would work with conventional #415 chain as the inner spacing between the outer bone links of the chain is 8mm.

Can you use the stock chain guard, that comes with the motor, with this tensioner?

The stock chain guard and this tensioner can coexist on your bike without issue.

Can these chain tensioners be used to tighten drive belts? I am converting to belt drive .

Yes, the pulley is 1" wide, so as long as the belt is not wider than an inch it will work.

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⚙️ Keep your ride tight, smooth, and unstoppable!

DURABILITY BOOSTER - Protects your nylon tension wheel and extends the lifespan of your chain and motor parts.
UNIVERSAL COMPATIBILITY - Fits 49cc, 66cc, and 80cc motorized bike engines—one solution for multiple rides.
CUSTOMIZABLE RIDE COMFORT - Adjust tension to your preference for a vibration-free, smooth cycling experience.
EFFORTLESS CHAIN STABILITY - Spring-loaded design keeps your chain perfectly tensioned, eliminating annoying pops and snaps.
EASY INSTALLATION MAINTENANCE - Compact metal build with versatile mounting options for hassle-free setup and long-term reliability.

The sthus Black Spring Loaded Chain Tensioner is a durable metal component designed for 49cc to 80cc motorized bike engines. Its spring-loaded mechanism maintains optimal chain tension, preventing chain popping and vibration, which enhances ride smoothness and extends the lifespan of your bike’s drivetrain components. Easy to install and adjustable, it’s a must-have upgrade for any serious motorized bike rider.

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Color	black
Material type	Metal
Number of items	1
Batteries included?	No
Brand	sthus
Manufacturer	sthus
Item model number	AMWZ_MZ0052-1
Package Dimensions	11.2 x 9.91 x 5.21 cm; 300 g
ASIN	B07NXX4PV4

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

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