# You asked: How do you adjust the chain tension on a dirt bike?

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## How much slack should be in a dirt bike chain?

Correct chain slack should be around 1 – 1.25 inches at the end of the chain guide. An accurate way to see if it is correct is to put 3 fingers between the chain and the swingarm, right at the end of the chain guide. The chain and swingarm should be pressing on your fingers.

## Why does my dirt bike chain keep falling off?

A motorcycle chain that keeps getting loose is usually caused by the rear axle or chain tensioning bolts not being tight enough. It can also be cause by a new chain not being worn in enough, worn down sprocket teeth, having too tight of a tension, or having the wrong size of chain installed.

## Why does my motorcycle chain have a tight spot?

The most common cause of chain tight spots is that your sprockets are not as concentric to the wheel or gearbox output shaft as they should be, IE running “out of true”. This can be due to wear, poor quality sprockets or chain, or poor fitting.

## Why is my bike chain so loose?

Chains often loosen when a bike does not have a derailleur. Derailleur is the gear changing mechanism towards the back of the bike. The derailleur helps to pull the chain and keep it tight. Bikes without a derailleur are single-speed bikes or fixies.

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## How do you calculate chain tension?

The forces on each end support are equal to the angular downward and inward force equal to chain tension. Solve for chain tension by dividing the total downward force, 49 lb. by 2 X (sin of the 2.86-degree angle).

## How tight should a kx85 chain be?

the chain is tightest. be within the standard value. Standard 54  64 mm (2.1  2.5 in.)

## Should my dirt bike chain be tight?

Too tight is as bad as too loose, but it’ll only take minutes to get it right. You should check and adjust your chain every 500 miles (805 km), and more often for a dirt bike. … 1.2–1.6 inches (30–40 mm) is typical for streetbikes, while dirt bikes may need 1.4–2.0 inches (35–50 mm) of slack.