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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Spring Loaded Chain Tensioner,2 Stroke Motorized Bicycle Chain Guide | Adjustable guide wheel in black. Fits 49cc, 66cc, 80cc 2-stroke engines for motorized push bikes

Spring Loaded Chain Tensioner,2 Stroke Motorized Bicycle Chain Guide | Adjustable guide wheel in black. Fits 49cc, 66cc, 80cc 2-stroke engines for motorized push bikes

Product ID: 109142520

Details

Brand
sthus
Material
Alloy Steel
Number of Items
1
Recommended Uses For Product
Ensuring chain
Strand Type
Single

🔩Durable corrosion-resistant alloy steel

⚙️Fits 49cc-80cc 2-stroke engines

🛠️Adjustable tension for perfect chain alignment

€ 29.02

Duties & taxes included

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Keep your chain tight, your ride smoother, and your build envy-worthy!

PRECISION FIT FOR YOUR RIDE - Engineered specifically for 49cc, 66cc, and 80cc 2-stroke motorized bikes to ensure seamless compatibility.
COMPLETE KIT WITH ALL ESSENTIALS - Includes all screws and nuts needed for a hassle-free upgrade—get your bike race-ready in no time.
SELF ADJUSTING SPRING LOADED DESIGN - Maintains optimal chain tension automatically, preventing derailment and sprocket wear without constant manual tweaks.
BUILT TO LAST WITH PREMIUM ALLOY STEEL - Constructed from thickened, corrosion-resistant metal to withstand harsh riding conditions and extend chain life.
EFFORTLESS INSTALLATION CUSTOMIZATION - Wide mounting hole range and adjustable guide wheel let you dial in the perfect tension quickly and easily.

The sthus Spring Loaded Chain Tensioner is a high-quality, adjustable guide wheel designed for 49cc, 66cc, and 80cc 2-stroke motorized bikes. Made from durable alloy steel with corrosion resistance, it ensures optimal chain tension and alignment to prevent derailment and sprocket wear. Easy to install with included hardware, this tensioner prolongs chain life and enhances bike performance, making it a must-have upgrade for any serious motorized bike enthusiast.

Specifications

ASIN	B07NXX4PV4
Best Sellers Rank	#30,407 in Automotive ( See Top 100 in Automotive ) #2 in Powersports Chain & Sprocket Kits
Brand Name	sthus
Customer Reviews	4.2 4.2 out of 5 stars (2,574)
Item Weight	300 g
Manufacturer	sthus
Material Type	Alloy Steel
Model	AMWZ_MZ0052-1
Part Number	AMWZ_MZ0052-1
Recommended Uses For Product	Ensuring proper chain tension in 49cc, 66cc, and 80cc motorized bikes
Strand Type	Single
Unit Count	1 Count

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