Q: What is the oil-gas mixing ratio for the MCCULLOCH HT 5622?

The mixing ratio for the McCulloch HT 5622 is 50:1 : you need to mix 77 ml of synthetic oil with 4 liters of unleaded gasoline . For a tank capacity of 0.5 L, this corresponds to 9.6 ml of oil for 0.5 L of gasoline . Required gasoline: unleaded gasoline with a minimum octane rating of 90 (RON). Never use pure gasoline or alternative fuels (E15, E20, E85) that are not approved for 2-stroke engines and will cause serious damage to the engine. Required oil: high-quality synthetic oil specifically designed for air-cooled 2-stroke engines. Automotive or marine oils are strictly prohibited and will damage the engine. Mixing procedure: first pour the gasoline into the can, then add the oil. Shake the can well for a few moments to achieve a homogeneous mixture. Always follow the instructions on the oil can. Do not use mixed fuels containing more than 10% alcohol, which cause moisture absorption and oil separation. Important warnings: alternative fuels cause serious problems such as engine malfunction, overheating, vapor lock, power loss, defective lubrication, and deterioration of the carburetor's internal pipes and components. Always use fresh fuel and dispose of any unused mixture after a few weeks of storage.

Question 1

Why does my MCCULLOCH MCC1840B chainsaw experience jerks or irregular acceleration?

Accepted Answer

The jerks or irregular acceleration of your MCCULLOCH MCC1840B chainsaw are generally caused by fuel supply issues, engine maintenance, or carburetor adjustment. Here are the diagnostic and correction steps, in order of priority:

1. Check the fuel mixture
The 2-stroke engine requires a mixture of unleaded gasoline and 2T oil at a ratio of 40:1. Always prepare fresh fuel: a mixture older than 90 days degrades and causes jerks. Use 3.2 oz of McCulloch oil for 1 US gallon of gasoline (or 125 ml for 5 liters). If you use another brand of 2T oil, strictly adhere to the 40:1 ratio.

2. Clean or replace the air filter
A clogged filter restricts air intake and causes irregularities. Inspect the filter before each use. If it is very dirty, replace it. Never clean the filter with water or a liquid product, as this would damage it.

3. Check the spark plug
A dirty, blackened, or worn spark plug causes irregular acceleration. Check the electrode gap: it should be exactly 0.025 inch (0.635 mm). Clean the spark plug or replace it if it is too worn. Use a resistive spark plug (reference: 9295-310801).

4. Replace the fuel filter
A clogged fuel filter reduces fuel flow and creates jerks. The manufacturer recommends replacing the filter every 20 hours of use. Completely empty the tank before changing the filter: hang the old filter with a hook-shaped wire, gently pull it out, then install the new one ensuring it goes all the way to the bottom of the tank.

5. Clean the spark arrestor screen
A clogged screen dramatically reduces engine performance. Remove the two nuts from the muffler, then replace the screen with a new one.

6. Adjust the carburetor at idle
If the jerks persist after the above steps, the problem lies with the carburetor adjustment. After allowing the engine to warm up (at least 10 seconds), use a Phillips screwdriver to turn the idle screw (accessible at the air filter height) a quarter to half a turn to the right. The engine should then run smoothly. If the chain runs at idle, turn the screw to the left until the chain stops, then let the engine idle. For optimal adjustment, consult an authorized McCulloch service center.

Tip: Irregular accelerations during the first few minutes after starting (before the engine is warm) are normal. If they persist during cutting or after full warming, apply the above steps in order. Regular maintenance keeps your chainsaw in good working condition.

Question 2

What is the oil-gas mixing ratio for the MCCULLOCH HT 5622?

Accepted Answer

The mixing ratio for the McCulloch HT 5622 is 50:1: you need to mix 77 ml of synthetic oil with 4 liters of unleaded gasoline. For a tank capacity of 0.5 L, this corresponds to 9.6 ml of oil for 0.5 L of gasoline.

Required gasoline: unleaded gasoline with a minimum octane rating of 90 (RON). Never use pure gasoline or alternative fuels (E15, E20, E85) that are not approved for 2-stroke engines and will cause serious damage to the engine.

Required oil: high-quality synthetic oil specifically designed for air-cooled 2-stroke engines. Automotive or marine oils are strictly prohibited and will damage the engine.

Mixing procedure: first pour the gasoline into the can, then add the oil. Shake the can well for a few moments to achieve a homogeneous mixture. Always follow the instructions on the oil can. Do not use mixed fuels containing more than 10% alcohol, which cause moisture absorption and oil separation.

Important warnings: alternative fuels cause serious problems such as engine malfunction, overheating, vapor lock, power loss, defective lubrication, and deterioration of the carburetor's internal pipes and components. Always use fresh fuel and dispose of any unused mixture after a few weeks of storage.

Question 3

What fuel and oil mixture does the MCCULLOCH GBV 322VX blower require?

Accepted Answer

The MCCULLOCH GBV 322VX blower uses a 2-stroke engine that requires a 50:1 gasoline to oil mixture (2% oil).

Correct dosing:

For 5 liters of gasoline: add 100 ml of 2-stroke engine oil
For 1 US gallon (3.78 l): add 77 ml of oil
For 1 UK gallon (4.54 l): add 95 ml of oil

Gasoline requirements:

Use new unleaded gasoline with a minimum octane rating of 90 RON (87 AKI). The ethanol concentration must be less than 10% (E10). Avoid gasoline with lead, below 90 RON, or with more than 10% ethanol.

Type of oil:

You should only use high-quality air-cooled 2-stroke engine oil. Important: do not prepare more than 30 days' worth of fuel in advance.

Question 4

What fuel mixture should be used for the brush cutter?

Accepted Answer

The TRIMMAC 250 25CC is equipped with a 2-stroke engine that requires a mixture of unleaded gasoline and 2-stroke oil at a ratio of 50:1.

This means that you need to pour 1 liter of 2-stroke oil for 50 liters of gasoline (or 20 ml of oil for 1 liter of gasoline). An incorrect mixture is one of the most common causes of starting difficulties and poor engine performance.

Always prepare your mixture in a clean container and mix well before filling the brush cutter's tank.

Question 5

How to change the cutting disc on the MCCULLOCH B43 BT brushcutter?

Accepted Answer

To change the cutting disc on your MCCULLOCH B43 BT brushcutter, follow the steps below safely:

Steps to change the cutting disc

Safety: Ensure that the machine is turned off and disconnected from any power source. If your model is battery-operated, remove the battery before starting.
Loosening the screw: Use an appropriate wrench to loosen the screw that holds the disc in place. Turn the screw counterclockwise (to the left) to unscrew it.
Removing the disc: Carefully remove the old disc from the chuck.
Installing the new disc: Place the new disc on the chuck, ensuring it is properly aligned and positioned correctly.
Securing: Re-tighten the screw by turning it clockwise (to the right) and tighten it firmly to hold the disc in place.
Checking: Ensure that the disc is securely fixed and has no play before restarting the machine.

Following these steps ensures a safe and effective disc change, prolonging the life of your MCCULLOCH B43 BT brushcutter.

Question 6

What type of fuel should be used for the McCulloch M53-190 ER lawn mower?

Accepted Answer

The McCulloch M53-190 ER lawn mower is equipped with a 4-stroke gasoline engine. To ensure optimal operation and longevity of your mower, it is recommended to use:

Unleaded gasoline with an appropriate octane rating (generally 95 or higher).
Fresh, high-quality fuel to avoid starting issues and clogging.

Avoid using gasoline containing more than 10% ethanol, as this can damage the engine. Additionally, do not add oil to the fuel, as the 4-stroke engine has a separate lubrication system.

By following these recommendations, you will ensure optimal performance and a prolonged lifespan for your McCulloch M53-190 ER mower.

Question 7

Why won't my MCCULLOCH B428 PS trimmer start and how can I resolve this issue?

Accepted Answer

If your MCCULLOCH B428 PS trimmer won't start, several common causes may be behind this problem. Here are the steps to check to try to resolve it:

1. Fuel Check

Make sure the tank contains fresh and suitable fuel (usually a 2-stroke gasoline mix if applicable).
If the fuel is old, empty the tank and refill it with new fuel.

2. Spark Plug Inspection

Remove the spark plug and inspect it for any signs of dirt or damage.
Clean the plug with a wire brush or replace it if it is worn or defective.
Ensure that the spark plug wire is properly connected.

3. Air Filter Inspection

A dirty or clogged air filter can prevent the engine from starting.
Clean the air filter according to the manufacturer's recommendations or replace it if it is too dirty.

4. Starter System Check

If your model is equipped with a pull starter, ensure that the cord is not stuck and operates correctly.
Check that all safety levers and controls are in the correct position for starting.

5. Other Tips

Ensure that the trimmer is on a stable surface and that starting conditions are optimal (e.g., cold engine).
If the problem persists after these checks, it may be necessary to consult a professional for a more in-depth diagnosis.

Question 8

How to start the MCCULLOCH VIRGINIA MH 542 lawn mower?

Accepted Answer

To start your MCCULLOCH VIRGINIA MH 542 lawn mower, follow these simple steps:

1. Preparation

Place the mower on a flat and clear surface.
Check that the fuel tank is filled.
Check the oil level to ensure optimal operation.

2. Checking the controls

Insert the ignition key if your model is equipped with one.
Make sure the safety lever is in the run position.

3. Using the choke

If the engine is cold, activate the choke to facilitate starting.

4. Starting the engine

Pull firmly and quickly on the starter cord without jamming it.
If the engine does not start after several attempts, wait a moment before trying again.

5. After starting

Deactivate the choke once the engine is running for normal operation.
Adjust the mower speed according to your needs.

By following these steps, your MCCULLOCH VIRGINIA MH 542 mower should start easily and be ready for use.

Question 9

How to fold and store the frame of the MC CULLOCH M53-190 ER lawn mower?

Accepted Answer

To fold and store the frame of your MC CULLOCH M53-190 ER lawn mower, proceed methodically and safely. The frame of this model is specially designed to be foldable to facilitate storing the machine in a limited space.

Preparation before folding

First, ensure that the mower is completely turned off and that the engine has cooled down. Wait at least a few minutes after stopping the engine for the thermal parts to no longer be hot. For added safety, you can disconnect the spark plug wire to prevent any accidental starting during folding.

Folding procedure for the frame

Locate the buttons (wing nuts) on each side of the frame, where it connects to the main structure of the mower.
Gradually and completely loosen these buttons by turning them counterclockwise. Do not remove them completely; just keep them loose enough to allow movement of the frame.
Slowly and steadily lower the frame towards the front of the machine, towards the cutting deck. The frame should fold gradually downwards.
Once the frame is in the folded position (horizontal or slightly raised towards the front), tighten the buttons firmly again to maintain this position and prevent the frame from accidentally unfolding during transport or storage.

Secure storage

After folding the frame, store the mower in a dry, well-ventilated place, protected from moisture, bad weather, and temperature fluctuations. This environment preserves the durability of the engine and mechanical parts. Ensure that the mower is stable and immobile, ideally on a flat and even surface. If you store the machine for a long time (more than 30 days), empty the fuel tank to avoid gasoline degradation and starting issues during the next use.

User manual MCCULLOCH : user manuals and guides in PDF

Models MCCULLOCH most viewed

Browse manuals MCCULLOCH by appliance type

Recent questions about devices MCCULLOCH