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 motorized bike parts.
CUSTOMIZABLE RIDE COMFORT - Easily adjust tension to your preference for a smoother, vibration-free cycling experience.
EFFORTLESS CHAIN STABILITY - Spring-loaded design keeps your chain perfectly tensioned, eliminating annoying pops and snaps.
UNIVERSAL FIT FOR MOTORIZED BIKES - Optimized for 49cc, 66cc, and 80cc 2-stroke engines—versatility that keeps you riding.
MADE IN THE USA WITH PREMIUM ALLOY STEEL - Quality craftsmanship ensures long-lasting performance and reliability.

The Sthus Black Spring Loaded Chain Tensioner is a precision-engineered alloy steel component designed for 49cc to 80cc motorized bikes. Its spring-loaded mechanism maintains optimal chain tension, preventing chain popping and vibration, while adjustable settings allow for personalized ride comfort. Made in the USA, this durable tensioner protects your drivetrain components, ensuring a longer-lasting, smoother motorized biking experience.

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Manufacturer	sthus
Brand	sthus
Package Dimensions	11.2 x 9.91 x 5.21 cm; 300 g
Item model number	AMWZ_MZ0052-1
Manufacturer Part Number	AMWZ_MZ0052-1
Material	Alloy Steel
Colour	Black
Manufacturer	sthus
Country of Origin	USA
Item Weight	300 g

Sthus Black Spring loaded chain tensioner for 49cc 66cc 80cc Engine Motorized bike 2 Stroke Engine

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