Cobra MT250C Operator's Manual
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Cobra MT250C Operator's Manual

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Bill Hodgson
May 30, 2025

Engine starts well but stalls when full throttle applied. Filter OK and no apparent air leaks?

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1 comments:
Mr. Anderson
May 30, 2025

A Cobra MT250C engine that starts well but stalls when full throttle is applied could be caused by incorrect spark plug installation, a flooded engine, or issues with fuel delivery such as an incorrect fuel/oil ratio or a clogged carburetor. Also, improper throttle cable adjustment or air filter blockage could affect engine performance at high speed.

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Summary of Contents for Cobra MT250C

  • Page 1 MT250C...

  • Page 2: Engine Part

    Attention Statements Throughout this manual are special CONTENTS attention statements. DANGER! A statement preceded by the triangular ENGINE PART.....1-16 attention symbol and the word "DANGER"indicates an imminently hazardous situation which, if not avoided, will result in death or BRUSH CUTTER....17-27 serious injury! POLE PRUNER....28-39 DANGER!

  • Page 3: Safety Precautions

    Introduction Safety Precautions Long reach hedge trimmer 2600 is designed and built to deliver superior performance and reliability without DANGER! compromise to quality, comfort, safety or durability. THE ARTICULATED HEDGE TRIMMER IS NOT INSULATED AGAINST ELECTRICAL SHOCK1 Approaching or contacting electrical IMPORTANT! lines with the trimmer could cause death or serious injury.

  • Page 4: Operating Precautions

    Operating Precautions Never operate this tool or any read and follow this manual, other power equipment if you are make sure anyone using the tired, ill, or under the influence of trimmer dose likewise. Failure alcohol, drugs, or any substance to do so could result in serious that could affect your ability or personal injury or machine...
  • Page 5 Operating Precautions WARNING! Never operate this machine or other Never permit a person without training power equiment if you are tired, ill, or or instruction to operate this machine. under the influence of alcohol, drugs, or any other substance that could Always make sure the cutter affect your ability of judgement.
  • Page 6 Installing the Powerhead 1.Place the powerhead on a clean, flat CAUTION! surface, spark plug facing up. 2.Use the 4mm allen wrench to loosen Do not force the lower tube info the tube clamp as shown in figure 4. the powerhead! Excessive force can damage the components.
  • Page 7 Connecting the Throttle Cable 1.Remove the air cleaner cover. 2.Connect the end of the throttle cable to the joint on the top of the carburetor. See Figure 6, figure 7. Connecting switch wires connect the switch wires between the engine and the main unit.

  • Page 8: Adjusting The Throttle Cable

    Adjusting the Throttle cable 1.Loosen the throttle cable nut at fan When 6mm free play is achieved, cover as shown in figure 9. tighten the two 10mm throttle cable nuts. When the throttle cable is correctly adjusted, and the throttle trigger is fully depressed (full throttle), the throttle will contact the stop on the throttle body.
  • Page 9 Assembling the Tube Sections 4.When the two tube halves are locked 1.Place the powerhead/lower tube together, slide the latch protector assembly and the upper tube into groove of latch, then tighten the assembly on a clean, flat surfaceso coupler screw. See Figure 13. that both assemblise fit end to end.

  • Page 10: Mixing Fuel

    Mixing Fuel CAUTION! WARNING! This engine is to be operated on a 25:1 Always minimize the risk of fire when mixture consisting of unleaded handling fuel! gasoline and 2-cycle mixing oil only. Always allow the pruner to cool before refueling! Some gasolines contain alcohol as an oxygenatel Oxygenated fuels may Wipe all spilled fuel and move the...
  • Page 11 Starting A Cold Engine-Restarting After Refueling Control Positions (cold engine) 3.Prime the engine by depressing the carburetor primer bulb four or five 1.Set the throttle trigger to "Fast idle" times, See Figure 26. You should be as follows (Figure 24): able to see fuel inside the bulb.
  • Page 12 Cranking The Engine CAUTION! WARNING! The recoil starter can be damaged by abuse. When starting the engine, make sure the cutting attachment is well clear Always engage the starter before of bystanders, pets or objects. The attempting to crank the engine. attachment may rotate during startup.

  • Page 13: Stopping The Engine

    2.Open the choke (Figure 31) and fully WARNING! depress the throttle trigger with your left hand, then pull the starter handle rapidly with your right hand to clear The cutting attachment will engage excess fuel from the combustion and rotate as the engine starts and chamber.

  • Page 14: Adjusting The Carburetor

    Safety Operation Adjusting The Carburetor This machine is designed especially WARNING! for cutting branches. Never use this machine for any other purposes. Never try to cut stones, The cutting attachment must never metals, plastics or any other hard rotate at engine idle speed. objects.

  • Page 15: General Maintenance

    General maintenance Daily maintenance Prior to each work day, perform the WARNING! following: Remove all dirt and debris from the Before performing any maintenance, engine, check the cooling fins and air repair, or cleaning work on the cleaner for clogging, and clean as machine, make sure the engine and necessary.

  • Page 16: Hour Maintenance

    10/15-Hour Maintenance 10-Hour Maintenance CAUTION! CAUTION! Before removing the spark plug, clean Do not operate the machine if the air the area around the plug to prevent dirt cleaner or element is damaged, or if and dust from getting into the engine's the element is wet or water soaked.

  • Page 17: Specifications

    Specifications Dry Weight Stopping Method.......Slide swich (Without Bar/Chain).......5.9kg Transmission Type.....Automatic, Engine Type....2-cycle, air-cooled, centrifugal clutch with bevel gear vertical-cylinder Oil Tank Capacity......400ml BorexStroke........34x28 mm Gearcase Ratio......1.06:1 Displacement........25.4cm Standard Equipment.......tool kit Engine speed at Idle......3000min containing a spark plug wrench, 4mm allen wrench and 8mm x Maximum engine speed....7500min 10mm spanner, strap, chain cover phillips screwdriver...

  • Page 18: Brush Cutter

    BRUSH CUTTER 1.PARTS LOCATION See figure 1 1.Air cleaner 2.Fuel tank 3.Clutch coupler system 4.Ignition switch 5.Throttle trigger 6.Hanger 7.handle A 8.Handle B 9.Handle C 10.Outer pipe 11Debris shield 12.Gearcase 13.Blade...

  • Page 19: Warning Labels On The Machine

    2. Warning labels on the machine (1) Read owner's manual before operation this machine (2) Wear head, eye and ear protection (3) Warning/attention (4) Keep all children, bystanders and helpers 15 meters away from the brush cutter. IMPORTANT If warning seals peel off or become soiled and impossible to read, you should contact the dealer from which you purchased the product to order new seals and offer the new seal in the required location.
  • Page 20 For safe operation and maintenance, symbols are carved in relief on the machine. According to these indications please be carful not to t ake mistake (a)The port to refuel the "mix gasoline" Position: fuel tank cap (b)The direction to close the choke Position:air cleaner cover (c)The direction to open the choke Position:air cleaner cover...
  • Page 21 I. Always be sure to include this manual when selling lending, or otherwise transferring the ownership of this product. J. Never allow children or anyone unable to fully understand the directions given in this manual to use this brush cutter. WORKING GEAR AND CLOTHING A.
  • Page 22 Obstacles, which can be cleared away. B. The area within a perimeter of 15m of the person using the brush cutter should be considered a hazardous area into which no one should enter while the brush cutter is in use, and when necessary yellow waning rope, warning signs should be placed around work area.
  • Page 23 3. When using your brush cutter, never take you eyes off. If you need to, place you throttle into idling position. 4. When using your brush cutter. Do not let the unit get closer to your feet nor raise the unit above your waist.
  • Page 24 3.Always be sure to turn off engine before performing any maintenance or checking procedures 4.When sharpening, removing, or reattaching the blode proper tools and equipment to prevent injury. 5.When replacing blade or any other parts or when replacing the oil or any lubricants, always be sure to use only products or products which have been certified by for use with the brush cutter.
  • Page 25 SAFETY GUARD Attach the safety guard to the gear case and fix it with the clampand 2bolls (M5*25) securely. (Figure 11) (1) Bolt (2) Clamp (3) Main pipe (4) Safety guard INSTALLING THE METAL BLADE (Figure 12) 1.Set the inner holder to the gear shaft , and turn to fix with the attached L-shaped bar. 2.Put the blade on the inner holder with letters to the gear case, and match correctly the hole of the blade to the projection of the inner holder.
  • Page 26 Stopping The engine WARNING! The cutting attachment can continue rotating after the engine is switched off! 1.Cooling the engine by allowing it to idle for two or three minutes. 2.Slide the ignition switch to the "O" or STOP position. See Figure 21 To Wear the Strap Figure 22 1.Hook the strap hook to hanger on the outer pipe.
  • Page 27 8. MAINTENANCE BLADE Sharpen each culting edge and make sure the bottom comer is rounded. (figure 24) Do not cool the blade with water in case of using grinder. It may cause cracks on blade. GEAR CASE Supply multi-purpose grease of every 25 hours of use. Remove the cutter holders to arrange for old grease to exit.

  • Page 28: Brush Cutter

    9. SPECIFICATION Name Brush cutter B250 Grass trimmer G250 Specification Handle type Loop Loop Power transmission method Automatic centrifugal clutch, spiral bevel gear Applied blade Metal blade Nylon cutter Blade rotation direction Counterclockwise(from operator’s view) Counterclockwise(from operator’s view) Outward size(L*W*H)(mm) 2040^380^330 2040^380^330 Weight(kg)

  • Page 29: Pole Pruner

    POLE PRUNER CAUTION! Always maintain this pole pruner When transporting the pruner in a according to the this owner's manual and vehicle , tie it down securely to prevent follow the recommended scheduled damage and fuel spillage. maintenance. Always stop the engine and allow it to Never modify or disable any of the pole cool before refueling.
  • Page 30 Operating the Pruner Emergency Release To Wear the strap 1.Hook the strap hook to the hanger on In case of emergency , strongly pull the the outer pipe. white tab at the hook . The machine will 2.Wear the strap so that the hook stays be released from the strap.

  • Page 31: Product Description

    Product Description Prior To Assembly Carefully inspect all components for damage. Using Figure 3 as a guide,familiarize yourself with the 2600 pole pruner and IMPORTANT its various componets Understanding your machine helps ensure top The terms left-hand ,and performance,longer service life,and “LH”;”right”,”right-hand”,and “RH”,”front”...
  • Page 32 Use unit without upper tube If the lower tube assembly is long enough,you can use it only without upper tube according to the working condition. Operate as follows: 1.Follow disassemblying the pole sections section to remove the upper tube/coupler assembly from gearcase. 2.Follow”assembling the pole sections”...
  • Page 33 Installing and Adjusting the Bar and China Installing The China 2. Place the guide bar over the guide bar adjustment stud on the cutting head WARNING! assembly. Align the chain tensioning pin with the hole in the guide bar. See Figure Never attempt to install, replace, or adjust the chain with the engine running.
  • Page 34 Adjusting the Chain Lift the nose of the guide bar while WARNING! turning the chain tensioning screw. See Figure 20. Never attempt to install, replace, or adjust the chain with the eingine running. WARNING! The saw chain is very sharp. Wear gloves to protect your hands when handling.
  • Page 35 Chain Oiler Adjusting Oil Flow Rate WARNING! CAUTION! Never fill the oil reservoir nor adjust An increase in bar oil flow rate will the oiler with the engine running. speed oil consumption, requiring more frequent checks on the oil IMPORTANT! reservoir.
  • Page 36 Cutting above obstacles: Typical applications Thanks to the unit's long reach it is Standard cut: possible to prune branches that are The most convenient working position is a overhanging obstacles, such as rivers or tool angle of 60°, but any other angle may lakes.
  • Page 37 Working techniques Flush-cutting thick branches: If branch diameter is more than 10cm ”) , Relieving cut: first perform undercut and cross cut at a To avoid tearing the bark, kickback or distance of about 25cm ”) from the pinching the bar when pruning thick final cut Then carry out the flush branches the bar when pruning thick...
  • Page 38 50-hour Maintenance Every 50 hours of operation (more frequently in dusty or dirty conditions): Remove and clean the cylinder cover and clean dirt and debris from the cylinder cooling fins. Remove the sprocket cover and inspect the sprocket for excessive dirt,debris,or wear, Remove the guide bar and clean out the guide bar groove.If the sprocket is excessively...
  • Page 39 Sharpening the Chain When the cutting edges of the blade become dull, they can be re-sharpened with a few strokes of a file. In order to keep the blade in balance, all cutting edges must be sharpened equally. In addition, inspect the chain for correct adjustment (more frequently with a new chain).
  • Page 40 Correct Filing Technique Correct angle on Silghtly protruding hook or point top plate (curve on non-chisel chain) Top of depth gauge at correct height below top plate Front of depth gauge rounded Filling Problems Top plate angle Top plate angle Cause Cause less than...

  • Page 41: Hedge Trimmer

    HEDGE TRIMMER CAUTION! WARNING! Always maintain the articulated hedge trimmer according to this owner's Never transport the articulated hedge manual and follow the recommended trimmer or set it down with the engine scheduled maintenance running could be accidently accelerated causing the blades to Never modify or disable any of the oscillate.
  • Page 42 Product description Prior to assembly Using figure 3 as a guide, familiarize Carefully inspect all components, yourself with the attachment of long reach Making sure they are not damaged hedge trimmer and its various IMPORTANT components. Understanding your machine helps ensure The terms left”, ”left-hand”, and “LH”...
  • Page 43 Installing the Hedge Trimmer Cutter Assembly WARNING! The cutter blades are very sharp. Do not handle the cutter assembly unless the protective blade cover is in place. IMPORTANT Always wear gloves when working with or near the cutter assembly. 1. Remove the output shaft from the rubber sleeve.

  • Page 44: Cutting Techniques

    Safety Operation Applications Preparations This machine is designed especially for triming hedge. Use lopping shears to cut out thick Never use this machine for any other branches first. Cutting sequence purposes. Never try to cut stones, metals, plastics or any other hard objects. If a radial cut is necessary, cut a little at Using for other purposes than trimming a time in several passes.
  • Page 45 Overhead cut Horizontal cut Hold the shaft upright with a 90° blade Cutting close to ground from a standing angle to cut an upper surface of a hedge. position, e.g.low shrubs. Horizontal cut Vertical cut Cutting without standing directly in front Cutting without standing directly next to of the hedge, e.g.
  • Page 46 Operating the Articulated Hedge Trimmer Always wear a hard hat to reduce the risk of head injuries during operation of this machine. Secure long hair Always wear eye and hearing so it is above protection. We recommends shoulder level. wearing a face shield as additional face and eye protection.
  • Page 47 EC-DECLARATION OF CONFORMITY EC Declaration of Conformity We herewith declare, Cobra Garden Machinery Henton & Chattell Ltd, London Road, Nottingham NG2 3HW United Kingdom That the following machine complies with the appropriate basic safety and health requirements of the EC Directive based on its design and type, as brought into circulation by us.

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