This BT-ES-80 engine kits was developed in 2016 and it is sold very well in North American and South American .
The cylinders have been changed three times in 2016, 2019 and 2020.
All the changese are aimed to improve its appearance and its performance.
Its advantage is the start way of electric start. Pull Start is only the supplimentary way of starting the engine when the battery is out of power.
This is the only electric start engine designed for bicycles which is available in the Chinese industry of bicycle engines. Its quality is good and reliable . If you prefer the electric start, just no hesitattion to take it .
The cylinder of this engine is made by die casing techique. More aluminium material and advanced fabricating techniques help improve the quality of the barrels. Except the barrels, all the parts like pistons, rings, clutch system and CDI have the good quality .
Please note that this 47mm pistons have the lower hole and its connecting rod is the short type. This is the difference points from the current BT-80 engines .
Product Specification
Engine Type: 2 stroke Single Cylinder Air-Cooled
Bore & Stroke: 47mm x 38mm
Real CC: 66CC
Commonly Named: 80CC
Max Power: 1.2KW
Compression Ratio: 7:1
Ignition: CDI
Start: Kick Start
Tank Size: 2 Litres
Fuel Consumption: 2.5-3.5L/100Km
Speed: up to 50KM/Hr. Depending On bike size, weight & road Conditions
Type Of Clutch: Rub Bloc Drying
Fuel: Unleaded 91 PETROL Mixed with 2 stroke oil
Start : Kick Start
Tank Capacity: 2L
Lubrication Oil: Two Stroke Oil
Max Speed: 45km/h - 55 km/h
Mixing Ratio of Fuel and Engine oil: 20:1 for new set, 25:1 after 500km
Difference from F50 Engine and F80 Engine
F80 Intake Ports: 32MM/40MM
BT-80 Intak Ports: 35MM
Package included as below
| SN | Description | Qty |
| 1 | 2019 Year 2 Stroke BT-ES-80 Engine 2 Stroke Electric 80cc Engine | 1 |
| 2 | High Quality NT careburetor | 1 |
| 3 | Fuel Line | 1 |
| 4 | Fuel Filter | 1 |
| 5 | Gas Tank Switch-Mal Type | 1 |
| 6 | 2L Gas Tank | 1 |
| 7 | Twist Throttle And Grip | 1 |
| 8 | Throttle Cable | 1 |
| 9 | Kill Switch | 1 |
| 10 | Chain Guard | 1 |
| 11 | 44T Wide Crank | 1 |
| 12 | Green Wire | 1 |
| 13 | CDI Units As Well As Starter Solennoid | 1 |
| 14 | Battery Box and Mounting Brackets | 1 |
| 15 | Special Chrome Muffler | 1 |
| 16 | Copper Outlet Gasket-High Quality | 1 |
| 17 | Big Clamp For Muffler | 1 |
| 18 | Small Clamp For Muffler | 1 |
| 19 | Heavy Duty 415 Chain- High Quality | 1 |
| 20 | Chain Idler With Bearing | 1 |
| 21 | Zinc 48T Sprocket With 9 Holes | 1 |
| 22 | Sprocket Clamp Kit | 1 |
| 23 | High Quality Spark Plug | 1 |
| 24 | Rear&Front Engine Clamp | 1 |
| 25 | U Shape Clamp | 1 |
| 26 | All Required Hardware | 1 |
Notes:
1. Intake Ports: 35MM
2. 47mm Piston With Lower Hole / Short Connecting Rod
3. Special Outlet Port and Special Muffler
4. Package A Size: 39*29*29CM, G.W.: 11 KGS ( Engine is contained in this package , without battery)
Package B size: 39*29*29CM, G.W.: 10 KGS 
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