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

Product ID: 267964920

Details

Brand
sthus
Item length
45 Inches
Load capacity
2.5E+2 bis 500
Material
Metal
Recommended uses for product
Maintaining in

🔧Adjustable tension for smooth ride

⚙️Spring-loaded precision tension

🏍️Fits 49cc-80cc motorized bikes

KD 11.49

Duties & taxes included

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Description

⚡ Keep your ride tight, smooth, and unstoppable!

UNMATCHED CHAIN STABILITY - Spring-loaded design eliminates chain popping and snapping for a worry-free ride.
CUSTOMIZABLE TENSION CONTROL - Easily adjust tension to your preferred tightness, ensuring optimal performance.
DURABILITY MEETS PERFORMANCE - Protects the nylon tension wheel and extends the lifespan of your chain and bike parts.
VIBRATION FREE RIDING EXPERIENCE - Reduces vibration and wear, transforming every ride into a smooth, enjoyable journey.
UNIVERSAL FIT FOR 49 CC TO 80 CC ENGINES - Perfectly engineered to support a wide range of motorized bike engines.

This black spring-loaded chain tensioner is designed for motorized bikes with 49cc, 66cc, and 80cc 2-stroke engines. It prevents chain popping and snapping by maintaining optimal tension through an adjustable spring mechanism. Made from durable metal, it reduces vibration, protects the nylon tension wheel, and extends the lifespan of your bike’s drivetrain components, ensuring a smoother and more reliable ride.

Specifications

ASIN	B07NXX4PV4
Best Sellers Rank	169,382 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 128 in Industrial Drive Belt & Chain Tensioners
Brand	sthus
Customer Reviews	4.1 out of 5 stars 2,445 Reviews
Item Length	45 Inches
Item Weight	300 Grams
Item length	45 Inches
Load Capacity	2.5E+2 bis 500 N
Load capacity	2.5E+2 bis 500 N
Manufacturer	sthus
Manufacturer Part Number	AMWZ_MZ0052-1
Material	Metal
Model Number	AMWZ_MZ0052-1
Recommended Uses For Product	Maintaining proper chain tension in motorized bikes with 49cc, 66cc, and 80cc engines
Recommended uses for product	Maintaining proper chain tension in motorized bikes with 49cc, 66cc, and 80cc engines
Strand Type	Multiple
Strand type	Multiple
Unit Count	1.0 count

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