LONCIN 25ZB21-1.2Q User Manual (English)

Denise AdamsAug 14, 2025

What to do if my LONCIN 25ZB21-1.2Q engine lacks power?

M
Michael PetersonAug 14, 2025
If your LONCIN Water Pump engine lacks power, start by checking the filter elements for clogs and clean or replace them if necessary. Ensure that the fuel tank has an adequate supply of fresh fuel. If the fuel is old, drain the fuel tank and carburetor, then refuel with fresh gasoline. For issues like a clogged fuel filter, carburetor malfunction, ignition malfunction, or a stuck valve, replace or repair the faulty components as necessary.

Brand	LONCIN
Model	25ZB21-1.2Q
Category	Water Pump
Language	English

Brand

LONCIN

Model

25ZB21-1.2Q

Engine Controls

Fuel Valve Lever

Controls fuel flow from tank to carburetor.

Throttle Lever

Adjusts engine speed by regulating fuel and air.

Engine Switch

Activates or deactivates the ignition system.

Choke Lever

Enriches fuel mixture for starting a cold engine.

Recoil Starter Grip

Used to manually crank and start the engine.

Check Before Operation

General Condition Check

Inspect engine for leaks, damage, and loose parts before operation.

Engine System Checks

Verify engine oil level, air filter condition, and fuel level.

Powered Equipment Check

Review safety precautions for the equipment connected to the engine.

Engine Operation

Safe Operating Precautions

Important safety guidelines to follow before and during operation.

Starting the Engine

Step-by-step process for starting the engine, including choke and throttle use.

Stopping the Engine

Standard procedure for safely shutting down the engine.

Setting Engine Speed

Adjusting the throttle lever to achieve the desired engine operating speed.

Maintenance

Importance of Maintenance

Explains the necessity of maintenance for performance and safety.

Maintenance Safety

Critical safety rules and precautions for performing maintenance.

Maintenance Schedule

Recommended service intervals for routine checks and part replacements.

Refueling

Procedures and precautions for safely adding fuel to the engine.

Fuel Recommendations

Guidance on the type and octane rating of gasoline to use.

Engine Oil Level Check

Instructions on how to check the engine oil level using the dipstick.

Engine Oil Change

Procedure for draining and refilling the engine oil.

Servicing Your Engine

General guidance for engine servicing and oil recommendations.

Air Filter Inspection

How to inspect the air filter element for dirt and damage.

Air Cleaner Service

Instructions for cleaning or replacing the air cleaner filter element.

Spark Plug Service

Procedures for inspecting, gapping, and replacing the spark plug.

Idle Speed Adjustment

How to set the engine's idle speed to the correct RPM.

Storage and Transporting

Storage Preparation

Steps to prepare the engine for long-term storage.

Draining Fuel Tank and Carburetor

Procedure to remove fuel for storage to prevent deterioration.

Transporting the Engine

Guidelines for safely moving the engine between locations.

Technical and Consumer Information

Serial Number Location

Identifies where to find the engine's serial number for reference.

High Altitude Operation

Explains adjustments needed for operating the engine at high altitudes.

Pump Operation and Setup

Pump Placement

Guidelines for positioning the pump for optimal performance and priming.

Suction Hose Installation

Instructions for correctly connecting the suction hose to the pump.

Discharge Hose Installation

Instructions for correctly connecting the discharge hose to the pump.

Priming the Pump

Procedure to fill the pump chamber with water before starting.

LONCIN 25ZB21-1.2Q User Manual

Table of Contents

Questions and Answers:

LONCIN 25ZB21-1.2Q Specifications

Summary

Information

Component Identification