Stirlingkit 80CC 2-Stroke Bicycle Engine Introduction & Startup Guide

I. Product Overview

This 80CC two - stroke engine is suitable for bicycles, small cars, and mini off - road all - terrain vehicles (ATVs). It is especially suitable for upgrading ordinary bicycles into motorized bicycles, allowing you to enjoy a faster riding speed of up to 30 km/h, almost as fast as a motorcycle or scooter, making your outdoor trips more convenient. The engine is suitable for most 26 - inch or 28 - inch bicycles with V - frames, such as mountain bikes, road bikes, cruisers, and choppers.

II. Engine Compatibility Judgment

1. Frame Type : This engine is mainly suitable for bicycles with V - frames. Check the shape of your bicycle frame. If it is a V - frame, it initially meets the compatibility conditions. If it is a special - shaped frame, it may not be directly installed, and additional custom - made or modified mounting brackets are required.

2. Size Compatibility : Confirm the wheel diameter of the bicycle. This engine is suitable for bicycles with 26 - inch or 28 - inch wheel diameters. At the same time, measure the dimensions of the frame mounting parts to ensure they match the dimensions of the engine mounting brackets. For example, the spacing of the mounting brackets and the bolt holes need to match the reserved positions on the frame.

3. Power Requirements : Consider your own expectations for the bicycle's power. The maximum speed of this engine can reach 30 km/h. If your expected speed is within this range and the daily riding conditions are not extremely steep or have special requirements, then this engine can meet general travel power needs. However, if you have higher speed or stronger climbing requirements, you may need to re - evaluate.

4. Transmission System Matching : Check the condition of the bicycle's original transmission system. Although the engine is equipped with a complete set of transmission components, such as chains and sprocket clamp assemblies, it is still necessary to ensure smooth connection with the bicycle's rear axle. For example, the specifications of the rear axle need to be consistent with the installation dimensions of the sprocket clamp assembly.

III. Product Parameters

1. Current Status : Brand - new

2. Packing Size : 26.00 x 20.00 x 18.00cm

3. Package Weight : 5.50kg

4. Rated Power : 1.65kw (5500r/min); 1.15Kw (5000r/min )

5. Max Power : 1.6Kw (6000r/min)

6. Speed : 5500r/min

7. Ignition Method : Electronic ignition (CDI)

8. Spark Plug Model : Z4C

9. Fuel : No. 90 gasoline

10. Lubricant : Two - stroke engine oil (or 10W/40, 10W/30 engine oil)

11. Fuel and Oil Mixing Ratio : 16:1 for new cars (20:1 after 500 kilometers)

12. Model : Two - stroke

13. Stroke : 38mm

14. Bore x Stroke : 80cc:47mm x 40mm

15. Displacement : 80cc

16. Engine Mode : Single - cylinder, air - cooling, two - stroke

17. Chain Model : 415

18. Chain Length : 110 links

19. Compression Ratio : 6:01

20. Driving Ratio : 18:01

21. Speed Limitation : 30km/hour

22. Volume of Oil Consumption : 1.5L/100km

23. Clutch Type : Friction Plate / Dry

24. Cooling Mode : Natural air cooling

IV. Product Features

1. 100% brand - new and high - quality.

2. Single - piece balanced crank, stroke 38mm.

3. The hardware used to install the bolts is much thicker.

4. Head tilt - greater clearance and higher - compression hardware.

5. Higher power and longer service life.

6. Heavy - duty metal engine body for added durability.

7. Super fuel - efficient, only consuming 1.5 litres of fuel per 100km.

8. Fast and smooth, can speed up to 30km/h.

9. Comes with all needed hardware for easy installation.

V. Bicycle Modification Tutorial

5.1 Preparatory Work

• Tool Preparation : Prepare basic tools such as wrenches (of different specifications for removing and installing bolts), screwdrivers (cross - head and flat - head), pliers (for clamping and bending parts), and hex wrenches (if there are corresponding hex bolts).

• Site Selection : Select a clean, flat, and well - lit work area, such as a garage or an indoor workbench. Ensure the ground is dry and avoid operating in a wet or muddy environment.

• Vehicle Inspection : Check the overall condition of the bicycle to ensure that the frame is not damaged, the braking system is normal, and the wheels rotate flexibly. In particular, check the size and structure of the V - frame to ensure it matches the engine mounting brackets.

5.2 Remove Original Parts (if necessary)

• Remove Pedals : If the pedal position conflicts with the engine installation position, use a wrench to unscrew the fixed bolts of the pedals and remove the pedals from the crank. Pay attention to keeping the bolts and washers.

• Clean the Frame Installation Area : Remove the debris, dust, and rust on the frame that may affect the engine installation to ensure the installation surface is flat and clean. You can gently sand the installation area to enhance the firmness of the installation.

5.3 Install the Engine Body

• Position the Engine : Place the engine in the reserved position of the bicycle's V - frame and roughly determine the installation position of the engine. Note that the direction of the engine's output shaft should be the same as the direction of the bicycle's rear - wheel sprocket to ensure that the chain can be correctly connected.

• Preliminary Fixing : Use the provided mounting brackets and bolts to preliminarily connect the engine to the frame, but do not fully tighten the bolts to facilitate subsequent fine - tuning.

5.4 Install the Sprocket Clamp Assembly

• Install on the Rear Axle : Install the sprocket clamp assembly on the rear axle of the bicycle. Ensure that the center of the sprocket is on the same horizontal line as the center of the engine's output - shaft sprocket. Otherwise, the chain will be skewed, affecting the transmission efficiency and service life.

• Tighten the Fixing Bolts : Use a wrench to tighten the fixing bolts of the sprocket clamp assembly to ensure that the assembly is firmly installed on the rear axle. During the tightening process, rotate the rear wheel from time to time to check whether the sprocket is installed flat and there is no shaking.

5.5 Connect the Chain

• Install the Chain : Pass the heavy - duty chain around the sprocket on the engine's output shaft and the sprocket clamp assembly on the rear axle. Ensure that the chain is correctly embedded in the sprocket teeth to avoid chain drop.

• Adjust the Chain Tension : If the chain is too tight, it will increase the wear of the transmission parts; if it is too loose, it is easy to cause the chain to drop. Use the chain tensioner/idler to adjust so that the sag in the middle of the chain is about 15 - 20mm in the natural drooping state. After adjustment, tighten the fixing bolts of the tensioner.

5.6 Install the Exhaust System

• Connect the Exhaust Muffler : Align one end of the exhaust muffler with the exhaust port of the engine and connect the two with an exhaust pipe clamp. Ensure that the connection is well - sealed. You can apply an appropriate amount of sealant at the interface to prevent exhaust gas leakage.

• Fix the Exhaust System : According to the structure of the bicycle, use zip ties or other fixing parts to fix the exhaust muffler on the frame to avoid shaking or collision during driving.

5.7 Install the Clutch and Throttle Parts

• Install the Clutch : Install the push - button clutch in a convenient position on the handlebar, generally near the brake handle. Connect the clutch cable to ensure that the clutch cable moves smoothly without jamming when pulled. Adjust the clutch stroke so that the clutch can accurately control the power output of the engine when released and gripped.

• Install the Throttle Parts : Install the throttle on the handlebar, usually on the same side as the brake handle. Connect the throttle cable to ensure that the throttle cable can flexibly control the opening of the carburetor throttle. Adjust the throttle sensitivity so that the throttle can smoothly control the engine speed when rotated.

• Install the Kill Switch : Install the kill switch near the throttle for quickly turning off the engine in case of an emergency. Connect the lines of the kill switch correctly to ensure there are no short - circuits or open - circuits.

5.8 Install the Fuel System

• Install the Fuel Tank : Install the fuel tank with mounting brackets in a suitable position on the bicycle, generally near the upper or lower tube of the frame. Use the provided installation accessories to firmly fix the fuel tank to ensure that the fuel tank does not shake or tip over during driving.

• Connect the Fuel Pipe : Connect the fuel pipe between the carburetor and the fuel tank. Ensure that the fuel pipe is not bent or damaged and is tightly connected to prevent fuel leakage. When connecting the fuel pipe, you can use a pipe clamp to fix the fuel pipe on the frame to avoid friction with other parts.

5.9 Install the Electrical System

• Install the CDI Ignition Coil : Install the CDI ignition coil in a dry, well - ventilated, and heat - free position on the frame. Use bolts or zip ties to fix it firmly to avoid damage due to vibration during driving.

• Connect the Lines : Connect the relevant lines of the spark plug, ignition switch, etc. Ensure that the lines are connected correctly and firmly, with no short - circuits or open - circuits. Arrange the lines neatly to avoid entanglement or friction with other parts. You can use a wire harness to bundle the lines together and fix them on the frame.

5.10 Install Other Parts

• Install the Chain Guard : Install the chain guard on the outside of the chain to ensure that it can effectively protect the chain and prevent foreign objects from being caught. Use bolts or clips to fix the chain guard on the frame.

• Store the Spark Plug Removal Tool : If there is a designated storage location, place the spark plug removal tool in that location for easy maintenance in the future.

• Install the Remaining Small Parts : Install all the remaining washers, small parts, etc. in the corresponding positions to ensure that each part is installed in place.

5.11 Inspection and Debugging

• Comprehensive Inspection : After the installation is completed, carefully check whether all parts are installed firmly, whether the bolts are tightened, and whether the lines and fuel pipes are connected correctly. Check the chain tension, the flexibility of the clutch and throttle operations, and the normal operation of the braking system.

• Debug the Engine : Start and debug the engine in a safe situation. First, check whether the fuel and oil mixing ratio is correct, then pull up the clutch, turn the ignition switch to the "ON" position, and gently step on the starting pedal or press the start button to start the engine. Observe the engine operation, check for abnormal noises, vibrations, or oil leakage. Adjust the idle speed and mixture concentration of the carburetor to make the engine run smoothly at idle speed and respond sensitively during acceleration.

5.12 Modification Precautions

• Tool Use : Be sure to use tools of the appropriate specifications to avoid bolt slipping or component damage due to mismatched tool sizes. Check the integrity of the tools before each use, such as whether the wrench is deformed or the screwdriver head is worn.

• Component Installation : Operate strictly in accordance with the installation sequence during the installation process. For some precision components, such as carburetors and CDI ignition coils, handle them with care to avoid collisions. After the installation is completed, check again whether the installation positions of all components are accurate and the connections are tight.

• Safety Operation : During the modification process, be sure to cut off the power supply to avoid operating electrical components when energized and prevent electric shock accidents. If welding or cutting parts is required, take fire - prevention measures, equip with fire extinguishers, and carry out the work in a well - ventilated environment.

• Legal Compliance : Before modifying the bicycle, understand the local laws and regulations on vehicle modification to ensure that the modified vehicle meets the road - going standards and avoid penalties for illegal modification.

VI. Usage Method

1. Fuel Mixing : This engine is a crankcase - scavenging two - stroke gasoline engine. The lubrication of the cylinders and transmission parts in the crankcase depends on the fuel - system lubrication. Therefore, the fuel used is a mixture of gasoline and lubricating oil. Before pouring the fuel into the fuel tank, pour gasoline and gasoline engine oil into a container according to a certain volume ratio, mix them evenly, and then pour them into the fuel tank. Never pour the two kinds of oil into the fuel tank one after the other.

2. Start the Engine : Ensure that the vehicle is in a safe state, pull up the clutch, turn the ignition switch to the "ON" position, and gently step on the starting pedal or press the start button to start the engine.

3. Driving Operation : Slowly release the clutch and gently turn the throttle at the same time, and the vehicle can move forward. Reasonably control the throttle and brakes according to the road conditions and needs.

VII. Precautions

1. Running - in Precautions : A new engine generally requires a running - in phase of more than 500 kilometers, and the same applies when the cylinder and piston ring are damaged and need to be updated. During the running - in phase, the speed should not exceed 20km/h, and the engine should not bear excessive load. Otherwise, it will cause the engine to overheat, seize the cylinder, and accelerate the wear of parts.

2. Fuel and Oil : Be sure to use No. 90 gasoline and the specified two - stroke engine oil and mix them according to the correct ratio.

3. Lubrication System : Engine oil is used as a lubricant. Without it, the performance and service life of the engine will be reduced. Please refer to the manual for more information, including the gasoline/oil ratio.

4. Safe Driving : When driving a vehicle installed with this engine, please abide by traffic rules and wear safety helmets and other protective equipment.

VIII. Maintenance

1. Regularly check whether the bolts and nuts of the engine are loose. If they are loose, tighten them in time.

2. Regularly replace the spark plug, engine oil, and air filter to ensure the performance of the engine.

3. When the engine is not used for a long time, empty the fuel in the fuel tank and clean and maintain the engine.

IX. Package List

1. 1x 80cc Engine Only