451S - Saw Shindaiwa - Free user manual and instructions
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| Product Type | Gasoline Chainsaw |
| Brand | Shindaiwa |
| Model | 451S |
| Engine Power | 2.6 kW |
| Displacement | 45 cm³ |
| Guide Bar Length | 45 cm (18 inches) |
| Weight (without bar and chain) | 5.5 kg |
| Fuel Tank Capacity | 0.45 L |
| Oil Tank Capacity | 0.25 L |
| Chain Pitch | 3/8 inch |
| Number of Drive Links | 72 |
| Sound Level (LwA) | 105 dB(A) |
| Vibrations (front/rear handle) | 3.5 m/s² / 5.2 m/s² |
| Ignition | Electronic CDI |
| Carburetor | Diaphragm, with altitude compensation |
| Starting System | Automatic recoil starter |
| Chain Brake | Yes, inertia activated |
| Chain Lubrication | Automatic, adjustable |
| Routine Maintenance | Air filter cleaning, chain sharpening, spark plug check |
| Wear Parts | Guide bar, chain, spark plug, air filter, belt |
Frequently Asked Questions - 451S Shindaiwa
What fuel to use for the Shindaiwa 451S?
Use a mixture of unleaded gasoline (95 or 98) and 2-stroke oil at a 50:1 ratio (2% oil). Follow the manufacturer's recommendations.
How to adjust chain lubrication?
Lubrication is automatic but adjustable via the flow screw located under the housing. Turn it clockwise to increase flow, counterclockwise to decrease.
What is the engine idle speed?
The recommended idle speed is about 2500 rpm. Consult the carburetor to adjust with the idle screw (LA) if necessary.
How to sharpen the chain of the 451S?
Use a 4.8 mm (3/16 inch) round file with a filing guide. File each tooth from inside to outside following a 30-degree angle.
What chain oil to use?
Use a biological adhesive oil for chainsaw chain. Avoid used oils that clog the system.
How to clean the air filter?
Unscrew the filter cover, remove the foam filter, wash it with soapy water, dry it well, then re-oil it with clean oil before reassembling.
What to do if the chain does not stop when the brake is applied?
Check that the chain brake is not engaged. If the chain still moves, tighten the brake or replace the brake spring.
How to change the guide bar?
Loosen the housing nuts, remove the housing, remove the chain from the guide, remove the guide, replace with a new one of the same length (45 cm) and reassemble while tensioning the chain.
What spark plug to use?
Recommendation: NGK BPMR7A or equivalent. Electrode gap: 0.5 mm.
How to start the chainsaw when cold?
Activate the choke, pump the primer bulb (if present), pull the cord slowly until you feel compression, then pull sharply. After first start, deactivate choke and restart.
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USER MANUAL 451S Shindaiwa
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Product information
Brand : Shindaiwa
Model : 451S
Category : Saw