Cobra RM46B - User Manual

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MODELS: RM46B RM46SPB RM46C RM46SPC

COBRA LAWN MOWER

OWNER’S MANUAL

Cobra Garden Machinery

Henton and Chattell Ltd., London Road, Nottingham NG2 3HW UK

www.cobragarden.co.uk

Table of Contents

Questions and Answers

A
Alicia BrownAug 8, 2025
Why Cobra Lawn Mower engine does not start?
- J
  John MooreAug 8, 2025
  If your Cobra Lawn Mower engine won't start, several factors could be the cause. First, ensure the throttle choke is correctly positioned for the current conditions. Check if the fuel tank is empty and refill it if necessary, referring to the engine manual for guidance. Inspect the air filter element for dirt and clean it as per the engine manual. Make sure the spark plug is tightened to 25-30Nm and that the spark plug wire is securely connected. Verify the spark plug gap is between 0.7 and 0.8mm. If the carburetor is flooded with fuel, remove the air filter element and pull the starter rope until the carburetor clears itself, then reinstall the air filter. If none of these steps work, it could be a faulty ignition module, in which case you should contact a service agent.
J
jessica26Aug 12, 2025
What to do if Cobra RM46B engine is difficult to start or loses power?
- A
  andrea43Aug 12, 2025
  If your Cobra Lawn Mower engine is hard to start or loses power, the issue might stem from a few things. Start by draining any old fuel and cleaning the tank, then refill it with fresh fuel. Also, check the fuel tank cap's vent hole to ensure it's not blocked; clean or replace the cap if needed. A dirty air filter element can also cause these problems, so clean it thoroughly.
R
Robin GonzalezAug 16, 2025
Why Cobra RM46B engine overheats?
- A
  Angela GrahamAug 16, 2025
  If your Cobra Lawn Mower engine overheats, it could be due to restricted cooling airflow. Remove any debris from the slots in the shroud, blower housing, and air passages to ensure proper ventilation. Another possible cause is an incorrect spark plug. For RM46B RM46SP models, use an RC12YC spark plug. For RM46C, RM46SPC, and RM46SPCE models, use an NGK BPR6ES spark plug.
J
Jessica AndersonAug 21, 2025
What to do if Cobra RM46B Lawn Mower engine operates erratically?
- F
  franktorresAug 21, 2025
  If your Cobra Lawn Mower engine runs erratically, consider these potential causes. A defective spark plug could be the culprit, so install a new, correctly gapped plug, referring to the engine owner's manual for specifications. An incorrect spark plug gap can also lead to erratic operation; set the gap between the electrodes to 0.7 to 0.8mm. Lastly, check the air filter element; if it's dirty, clean it following the instructions in the engine owner's manual.
J
Jennifer HendersonAug 26, 2025
How to fix Cobra RM46B that idles poorly?
- L
  Lauren ReynoldsAug 26, 2025
  If your Cobra Lawn Mower engine idles poorly, there are a few things to inspect. A dirty air filter element can cause this issue, so clean it according to the engine owner's manual. Also, check the air slots in the engine shroud and remove any blockages. Finally, clear any debris from the cooling fins and air passages under the engine blower housing.
M
Mark HendersonAug 29, 2025
What to do if Cobra RM46B Lawn Mower engine skips at high speed?
- R
  Robin MaciasAug 29, 2025
  If your Cobra Lawn Mower engine skips at high speed, the gap between the spark plug electrodes may be too close. Set the gap between the electrodes to 0.7 to 0.8mm.
B
Brian ArnoldSep 2, 2025
Why Cobra Lawn Mower vibrates abnormally?
- G
  gregorynathanSep 2, 2025
  If your Cobra Lawn Mower vibrates abnormally, it might be because the cutting assembly is loose; try tightening the blade. Alternatively, the cutting assembly might be unbalanced, in which case you should balance or replace the blade.

Cobra RM46B Specifications

General

Brand	Cobra
Model	RM46B
Category	Lawn Mower
Language	English

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