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 & mounting

€ 29.02

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Description

⚙️ Keep your motorized bike chain tight and your ride unstoppable!

BUILT TO LAST - Crafted from thickened, corrosion-resistant alloy steel for unbeatable durability and long-term performance.
PRECISION CHAIN CONTROL - Spring-loaded tensioner keeps your chain perfectly aligned, preventing derailment and sprocket wear.
PROTECT YOUR RIDE INVESTMENT - Prevents chain breakage and damage to side covers and stator plates—keep your motorized bike running smooth.
UNIVERSAL FIT FOR 2 STROKE BIKES - Compatible with 49cc, 66cc, and 80cc engines—one tensioner to rule them all.
EFFORTLESS INSTALLATION ADJUSTMENT - Wide mounting range and adjustable guide wheel make setup quick and hassle-free.

The sthus Spring Loaded Chain Tensioner is a premium alloy steel guide designed for 49cc, 66cc, and 80cc 2-stroke motorized bicycles. It ensures optimal chain tension and alignment to prevent derailment and sprocket wear, extending chain life and protecting critical bike components. Featuring adjustable mounting and tension settings, it offers easy installation and durable corrosion-resistant construction for reliable, long-lasting performance.

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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€ 29.02

Duties & taxes included

In stock

Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Cyprus.

Secure transaction

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