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

Spring Loaded Chain Tensioner,2 Stroke Motorized Bicycle Chain Guide

Product ID: 367828773

Details

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

🔧Adjustable chain tightness

⚙️Spring-loaded precision tension

🛠️Durable alloy steel build

COP 192675

Duties & taxes included

In stock

Sold byAmazon ColombiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Keep your ride smooth, tight, and unstoppable!

EFFORTLESS CHAIN STABILITY - Spring-loaded design eliminates chain popping and snapping for a seamless ride.
UNIVERSAL FIT FOR 49 CC 80 CC - Compatible with a wide range of motorized bike engines, maximizing versatility.
CUSTOMIZABLE TENSION CONTROL - Adjust tension to your exact preference, ensuring optimal performance every time.
VIBRATION FREE RIDING EXPERIENCE - Reduces chain vibration and wear, extending the lifespan of your bike components.
MADE IN THE USA WITH PREMIUM ALLOY STEEL - Built tough to withstand rugged use and keep you riding longer.

The Spring Loaded Chain Tensioner by sthus is a precision-engineered alloy steel component designed for 49cc to 80cc motorized bicycles. 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 parts. Easy to install and adjustable, this USA-made tensioner is a must-have upgrade for any serious motorized bike enthusiast.

Specifications

ASIN	B07NXX4PV4
Brand Name	sthus
Country of Origin	USA
Customer Reviews	4.2 4.2 out of 5 stars (2,455)
Item Highlight	Adjustable guide wheel in black. Fits 49cc, 66cc, 80cc 2-stroke engines for motorized push bikes
Item Weight	300 Grams
Manufacturer	sthus
Material Type	Alloy Steel
Model Number	AMWZ_MZ0052-1
Number of Items	1
Number of Packs	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	1.0 Count

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