18 Best 4 Stroke Bike Kit of 2022 – Romance University

After hours researching and comparing all models on the market, Romance University finds out Top 18 Best 4 Stroke Bike Kit of 2022. Check our ranking below.

2,760 Reviews Scanned

Rank No. #1
Iglobalbuy 49cc Powerful Pull Start 4-Stroke Cycle Motor Kit Compete Gas Kit Motorized Bike Petrol Gas Bicycle Engine for 28” V frame Bike and 26” ATV
  • This engine is a 4-stroke motor engine kits, includes everything a motor needs at a economic price
  • This 4-stroke motor is more stable, more reliable and Quieter than the 2 stroke rivals
  • With powerful motor and 44 tooth 9 hole sprocket, this motor is with speed 27-32 MPH / or 43-51 KPH
  • With 41.8 x 36 mm bore stroke,49 cm3 displacement, oil tank capacity 2.5L
  • Fits normal 28” V frame bike and 26” ATV bike , both with 28-40mm frame tube
Rank No. #2
WPHMOTO Lifan 140cc 4-Stroke Racing Engine Motor and Muffler Exhaust With Pipe for XR50 CRF50 XR CRF 50 70 ATC70 Dirt Pit Bike Motorcycle
  • High performance Lifan 140cc engine, N-1-2-3-4 Gear, manual clutch, 4 stroke 4 speed, Shaft size: 17mm
  • Max. Power & Corresponding Speed: 8kw(7500±375) / Max. Torque & Corresponding Speed: 9.5N.M(5000±250)
  • Replacement / upgrade for XR50 CRF50, Kawasaki KX KLX and other most popular dirt bikes
  • Easy to hook everything up: Just remove your existing engine and reverse the process to put the new one in
  • Package include: (1)Lifan 140cc Engine (1)Kick Starter Lever (1)Gear Shift Lever (1)Intake Manifold (1)Manifold hardware kit (1)Carburetor (1)Air Filter (1)CDI (1)Ignition coil (1)Wire Harness (1)Exhaust Muffler Pipe(1)Clutch Cable
Rank No. #3
Anbull 49CC 4 Stroke Gas Petrol Motorized Bike Bicycle Engine Motor Kit for 28” V Frame Bike and 26” ATV
  • 49cc 4 stroke pull start petrol conversion kit fits for normal 28” V frame bike and 26” ATV bike , both with 28-40mm frame tube. Note: Installation instruction not included.It is recommended to find a professional to install or refer to videos online by searching "49CC bike motor installation".
  • This 4 stroke bicycle engine kit is more stable, more reliable and Quieter than the 2 stroke rivals.
  • Mode of engine: single cylinder, air-cooling, 4-stroke; Compression ratio:8.0 : 1; Ignition System: Transistorized magneto ignition. Pls note: The switch has two cables (green and black) and the engine has one cabel (black), you can just connect the black to black and don' t need to connect the green cable.You can wrap it with a electrical tape.
  • 4-stroke 49cc bike engine kit is perfect to upgrade the regular bike to a motorized bike,you can enhance the riding experience by accelerating the speed.
  • With powerful motor and 44 tooth 9 hole sprocket, this motor is with speed 27-32 MPH / or 43-51 KPH.With 41.8 x 36 mm bore stroke,49 cm3 displacement, oil tank capacity 2.5.
Rank No. #4
WPHMOTO Complete set of Lifan 125cc Engine Semi-Auto 4 Stroke Motor with Wiring Harness Carburetor Chain Sprocket Exhaust Muffler Pipe Kit for Trail Bike CT70 90 110 125 Dirt Bike Trike
  • Lifan 1P54FMI 125cc engine, Gears: N-1-2-3-4, Automatic clutch with 15T 428 chain sprocket, Shaft size: 20mm
  • Has the standard mounting points, fit basically any monkey/dax/supercub/pitbike
  • Replacement / upgrade for Trail Bike CT70 90 110 125 and other most popular bikes
  • Comes with: engine, carburetor kit, exhaust pipe kit, chain & sprocket, throttle kit, wiring narness & electrical components
  • Please check the mounting hole spacing before buying
Rank No. #5
ZXTDR Lifan 140cc Engine Motor for XR50 CRF50 XR CRF 50 70 ATC70 Dirt Pit Bike Motorcycle | N1234 Gear 4 Stroke Racing Engine
  • High performance Lifan 140cc engine, N-1-2-3-4 Gear, manual clutch, 4 stroke 4 speed
  • Replacement / upgrade for XR50 CRF50, Kawasaki and other most popular dirt bikes
  • This kit comes with engine, starter & gear lever, manifold kit, Carburetor, Air Filter, Wire harness, CDI, Ignition coil, Clutch Cable
  • Easy to hook everything up: Just remove your existing engine and reverse the process to put the new one in
  • See below Product Description for more specifications
Rank No. #6
TDPRO Full Set of Lifan 125cc Engine Semi-Auto 4 Stroke Motor with Wiring Harness Carburetor Chain Sprocket Exhaust Muffler Pipe for Trail Bike CT70 90 110 125 Dirt Bike Trike
  • Lifan 1P54FMI 125cc engine, Gears: N-1-2-3-4, Automatic clutch with 15T 428 chain sprocket, Shaft size: 20mm
  • Has the standard mounting points, fit basically any monkey/dax/supercub/pitbike
  • Replacement / upgrade for Trail Bike CT70 90 110 125 and other most popular bikes
  • Comes with: engine, carburetor kit, exhaust pipe kit, chain & sprocket, throttle kit, wiring narness & electrical components
  • Please check the mounting hole spacing before buying
Rank No. #7
MOTOOS 49CC 4 Stroke Motorized Cycle Engine Motor Kit Compatible with Normal 28" V Frame Bike and 26" ATV Bike Bicycle Full Set
  • 49cc 4 stroke pull start conversion kit fits for normal 28” V frame bike and 26” ATV bike , both with 28-40mm frame tube
  • With powerful motor and 44 tooth 9 hole sprocket, this motor is with speed 27-32 MPH / or 43-51 KPH
  • Key parameters: 41.8 x 36 mm bore stroke; 49 cm3 displacement; Oil Capacity: 0.25L; Fuel Tank Capacity: 0.77L
  • Mode of engine: single cylinder, air-cooling, 4-stroke; Compression ratio:8.0 : 1; Ignition System: Transistorized magneto ignition
  • 4-stroke 49cc engine kit is perfect to upgrade the regular bike to a motorized bike,you can enhance the riding experience by accelerating the speed
Rank No. #8
66/80cc BBR Tuning Bullet Train Electric Start Engine Kit - Silver
  • ELECTRIC START: The 66/80cc BBR Tuning Bullet Train Bike Engine Kit has an electric start that makes pedal-starting your engine a thing of the past. It also has a centrifugal clutch, making it simple to use the pull start to start your engine. Unlike other bicycle engines that require a clutch that needs constant maintenance, the Bullet Train has a centrifugal clutch that never needs to be disengaged. Just pull the pull rope or his the electric start, and in seconds you're ready to ride
  • HIGH PERFORMANCE: The Bullet Train is a 5hp (horse power) 66/80cc single cylinder air cooled electric start bike engine kit. It features high quality components to ensure a long life span with low maintenance. It can reach up to 30mph which makes it great for commuting around town.
  • RELIABLE: All of the BBR Tuning bike engines feature the latest upgrades, including Japanese crank bearings and clutch components. We make certain that all of our manufactures abide by strict quality control assurance measures and use the highest quality material so that we can make certain that all of our customers get only the best. Made for experienced riders and builders, our BBR Tuning Bullet Train engine kit is ready soar- are you?
  • EASY INSTALLATION: This kit makes installation a breeze, it includes the necessary components to install on most 26" wheel bikes (Mountain, Cruiser, Chopper, Road) with V styled frames. The frame should have 9-11" of clearance between the bottom bracket and top bar, and the diameter of the frame tubes should be 25-29mm (around an 1"). The rider only needs some basic hardware skills, tools, and around 2-3 hours for installation and fine tuning adjustments
  • INDUSTRY LEADING 6 MONTH WARRANTY: Backed by an industry leading 6 month manufacture warranty and lifetime support the BBR Tuning 66/80cc Engine Kit comes with the industries best support and a satisfaction guarantee
SaleRank No. #9
125cc Engine 4 Stroke Motor Single cylinder with Air-Cooled Motor Engine Pit Dirt Bike For Honda CRF50 CRF70 XR50 XR70 Dirt Pit Bike Motorcycle Spark Plug A7TC
  • ★【Type】: Single cylinder, 4-stroke with air-cooled, and clutch operated by hand.
  • ★【Power】: Max Power: 6.5 kW/7500r/min±375r/min, Max Torque: 8.0 Nm/5000r/min±250r/min;Idle Speed: 1500r/min, Min Fuel Consumption: ≤370g/kw.h, Ignition System: CDI.
  • ★【Gear Ratio】: Gear Ratio:2.833/1.706/1.238/0.958, Compression Ratio: 9.0:1, Primary Reduction;Ratio: 3.722, Carburetor Type:PZ16J,Transmission:4-speed, Manual clutch, 4 Up; Start Mode: Kick-starter.
  • ★【High performance】: A high performance engine, perfect for those comfortable with faster engines and have a desire to get up and go; Wide range of applications, can be applied for bicycles, models, skateboards and so on. Excellent quality, great bike engine motor accessories.
  • ★【Fits】: HOMDA CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50.
Rank No. #10
KABOCHO 4-Stroke 49cc Petrol Gas Motor Bicycle Engine Complete Kit Motorized Bike
  • 49cc 4 stroke pull start petrol conversion kit Replacement for normal 28” V frame bike and 26” ATV bike , both with 28-40mm frame tube.
  • Key parameters: 41.8 x 36 mm bore stroke; 49 cm3 displacement; Oil Capacity: 0.25L; Fuel Tank Capacity: 0.77L.
  • With powerful motor and 44 tooth 9 hole sprocket, this motor is with speed 27-32 MPH / or 43-51 KPH.
  • 4-stroke 49cc engine kit is perfect to upgrade the regular bike to a motorized bike,you can enhance the riding experience by accelerating the speed.
  • Mode of engine: single cylinder, air-cooling, 4-stroke; Compression ratio:8.0 : 1; Ignition System: Transistorized magneto ignition.
Rank No. #11
TFCFL 125cc Engine 4 Stroke Motor Single cylinder with Air-Cooled Motor Engine Pit Dirt Bike For Honda CRF50 CRF70 XR50 XR70 Dirt Pit Bike Motorcycle Spark Plug A7TC (125cc Engine 4 Stroke)
  • 【Type】: Single cylinder, 4-stroke with air-cooled, and clutch operated by hand.
  • 【Power】: Max Power: 6.5 kW/7500r/min±375r/min, Max Torque: 8.0 Nm/5000r/min±250r/min;Idle Speed: 1500r/min, Min Fuel Consumption: ≤370g/kw.h, Ignition System: CDI.
  • 【High performance】: A high performance engine, perfect for those comfortable with faster engines and have a desire to get up and go; Wide range of applications, can be applied for bicycles, models, skateboards and so on. Excellent quality, great bike engine motor accessories.
  • 【Gear Ratio】: Gear Ratio:2.833/1.706/1.238/0.958, Compression Ratio: 9.0:1, Primary Reduction;Ratio: 3.722, Carburetor Type:PZ16J,Transmission:4-speed, Manual clutch, 4 Up; Start Mode: Kick-starter.
  • 【Fits】: HONDA CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50.
Rank No. #12
49CC 4 Stroke Gas Petrol Motorized Bicycle Bike Engine Motor Kit for 28” V Frame Bike and 26” ATV Bike Bicycle Engine Full Set
  • 49cc 4 stroke pull start petrol conversion kit fits for normal 28” V frame bike and 26” ATV bike , both with 28-40mm frame tube. Note: Installation instruction not included.It is recommended to find a professional to install or refer to videos online by searching "49CC bike motor installation".
  • Mode of engine: single cylinder, air-cooling, 4-stroke; Compression ratio:8.0 : 1; Ignition System: Transistorized magneto ignition
  • With powerful motor and 44 tooth 9 hole sprocket, this motor is with speed 27-32 MPH / or 43-51 KPH
  • Key parameters: 41.8 x 36 mm bore stroke; 49 cm3 displacement; Oil Capacity: 0.25L; Fuel Tank Capacity: 0.77L
  • 4-stroke 49cc engine kit is perfect to upgrade the regular bike to a motorized bike,you can enhance the riding experience by accelerating the speed
Rank No. #13
Lifan 125cc Engine Semi-Auto 4 Stroke Motor for Trail Bike CT70 90 110 125 Dirt Bike Trike Four Wheeler
  • Lifan 1P54FMI 125cc engine, Gears: N-1-2-3-4, Automatic clutch with 15T 428 chain sprocket, Shaft size: 20mm
  • Has the standard mounting points, fit basically any monkey/dax/supercub/pitbike
  • Replacement / upgrade for Trail Bike CT70 90 110 125 and other most popular bikes
  • This kit comes with: engine, intake manifold, kick starter, manifold kit
  • Please check the mounting hole spacing before buying
Rank No. #14
125CC 1P52FMI 4 Stroke Engine Motor Single Cylinder Fits H-on-da CRF50 70 XR50 Z50
  • 【Fits (For the reference)】For H//O//N//D//A CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50 /
  • 【Lubricant】SAE15W/40-SE, 4-stroke gasoline engine oil
  • 【Type】Single cylinder, 4-stroke with air-cooled, and clutch operated by hand
  • 【Power】Max Power: 6.5 kW/7500r/min±375r/min Rated Power: 5.6 kW/7500r/min±375r/min Max Torque: 8.0 Nm/5000r/min±250r/min Idle Speed: 1500r/min±100r/min
  • 【WARRANTY】 if any questions during installation or operation, plaese contact our customer service and they will handle your problem imediately!"
Rank No. #15
JCMOTO 125cc Engine 4 Stroke Motor Semi-Auto 3 Forward 1 Reverse Gear for ATV 4 Wheelers Tricycle
  • This 125cc Semi-Auto Engine has reverse gear suitable for ATV UTV 4 Wheelers
  • Speed complete racing engine, 3 forward 1 reverse gear
  • Upgrade your stock 50cc to this 125cc monster, you can feel the power difference immediately
  • See below description for more specifications and wiring
Rank No. #16
125CC Engine Motor, 12V Single Cylinder 4-stroke with Air-Cooled Motor Engine Pit Dirt Bike For Honda CRF50 CRF70 USA STOCK
  • ☀【Power】Max Power: 6.5 kW/7500r/min±375r/min, Voltage: 12V, Max Torque: 8.0 Nm/5000r/min±250r/min, Idle Speed: 1500r/min, Min Fuel Consumption: ≤370g/kw.h, Ignition System: CDI, Type: Single cylinder, 4-stroke with air-cooled, and clutch operated by hand.
  • ☀【High performance】A high performance engine, perfect for those comfortable with faster engines and have a desire to get up and go; Wide range of applications, can be applied for bicycles, models, skateboards and so on. Excellent quality, great bike engine motor accessories.
  • ☀【Gear Ratio】Gear Ratio:2.833/1.706/1.238/0.958, Compression Ratio: 9.0:1, Primary Reduction Ratio:3.722, Carburetor Type:PZ16J,Transmission:4-speed, Manual clutch, 4 Up; Start Mode: Kick-starter.
  • ☀【Fitment】 For HONDA CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50.
  • ☀【Logistics and Service】Sometimes the carrier is not very good at taking care of our packages, so it may cause some damage in transit. If there is any damage to the product you receive, please contact us at any time, and we will do our best to solve for you.
Rank No. #17
4-Stroke 125CC Motor Engine Pit Dirt Bike ATV Quad Kit Manual Clutch Single Cylinder CDI Air Cooled for CRF50 CRF70 XR50 XR70 Z50 Z50R
  • 【HIGH PERFORMANCE】A high performance engine, perfect for those comfortable with faster engines and have a desire to get up and go; Wide range of applications, can be applied for bicycles, models, skateboards and so on. Excellent quality, great bike engine motor accessories.
  • 【MAIN PARAMETER 1】Type: Single cylinder, 4-stroke with air-cooled, and clutch operated by hand; Bore x Stroke: 52.4mm x 55.5mm (2.06'' x 2.2''); Displacement: 119.7ml; Compression Ratio: 9.0:1; Max Power: 6.5 kw/7500r/min ± 375r/min; Rated Power: 5.6 kw/7500r/min ± 375r/min; Max Torque: 8.0 Nm/5000r/min ± 250r/min; Idle Speed: 1500r/min ± 100r/min; Min Fuel Consumption: ≤367g/kw.h; Ignition System: CDI; Start Mode: Kick-starter.
  • 【MAIN PARAMETER 2】Spark Plug: A7TC; Clutch: Wet multi-plate; Transmission: 4-speed, Manual clutch, 1 down 3 up; Carburetor Type: PZ16J; Primary Reduction Ratio: 3.722; Gear Ratio: 2.833/ 1.706/ 1.238/ 0.958; Lubricant Capacity: 900ml; Lubricant: SAE15W/40-SE, 4-stroke gasoline engine oil; Package Size: 19.7'' x 14.6'' x 13''; Package Weight: 46lbs.
  • 【FITMENT】For CRF50 / CRF70 / XR50 / XR70 / Z50 / Z50R / CT70 Mini Trail / Z50 / Minitrail Monkey / XL70 ST70 / QA50 / QR50 / CL70 / SL70 / 70 Passport / ST 90K2 / ST 90K1 / CS 90 / SL 90 / ZB 50.
  • 【PACKAGE CONTENTS】1 x 125CC 1P52FMI ENGINE, 1 x Kick Starter Lever, 1 x Gear Shift Lever, 1 x Carburetor, 1 x Intake Manifold, 1 x CDI, 2 x Intake Gaskets.
Rank No. #18
WPHMOTO Lifan 150cc 4 Stroke Oil Cooled Racing Engine Motor With Carburetor Wiring Harness Kit for XR50 CRF50 XR CRF 50 70 Dirt Pit Bike Motorcycle
  • Lifan 150cc engine, 1-N-2-3-4 gear, manual clutch, 4 stroke 4 speed, single cylinder, Speed
  • Max. Power & Corresponding Speed: 9kw(7500±375) / Max. Torque & Corresponding Speed: 11N.M(5000±250)
  • Bore x Stroke: 56.5mm x 59mm / Sprocket: 15T 428 Chain / Shaft size: 17mm
  • Replacement / upgrade for XR50 CRF50, Kawasaki KX KLX and other most popular dirt bikes
  • See below Product Description for more specifications

How Do You Buy The Best 4 Stroke Bike Kit?

Do you get stressed out thinking about shopping for a great 4 Stroke Bike Kit? Do doubts keep creeping into your mind? We understand, because we’ve already gone through the whole process of researching 4 Stroke Bike Kit, which is why we have assembled a comprehensive list of the greatest 4 Stroke Bike Kit available in the current market. We’ve also come up with a list of questions that you probably have yourself.

Romance University has done the best we can with our thoughts and recommendations, but it’s still crucial that you do thorough research on your own for 4 Stroke Bike Kit that you consider buying. Your questions might include the following:

  • Is it worth buying an 4 Stroke Bike Kit?
  • What benefits are there with buying an 4 Stroke Bike Kit?
  • What factors deserve consideration when shopping for an effective 4 Stroke Bike Kit?
  • Why is it crucial to invest in any 4 Stroke Bike Kit, much less the best one?
  • Which 4 Stroke Bike Kit are good in the current market?
  • Where can you find information like this about 4 Stroke Bike Kit?

We’re convinced that you likely have far more questions than just these regarding 4 Stroke Bike Kit, and the only real way to satisfy your need for knowledge is to get information from as many reputable online sources as you possibly can.

Potential sources can include buying guides for 4 Stroke Bike Kit, rating websites, word-of-mouth testimonials, online forums, and product reviews. Thorough and mindful research is crucial to making sure you get your hands on the best-possible 4 Stroke Bike Kit. Make sure that you are only using trustworthy and credible websites and sources.

Romance University provides an 4 Stroke Bike Kit buying guide, and the information is totally objective and authentic. We employ both AI and big data in proofreading the collected information. How did we create this buying guide? We did it using a custom-created selection of algorithms that lets us manifest a top-10 list of the best available 4 Stroke Bike Kit currently available on the market.

This technology we use to assemble our list depends on a variety of factors, including but not limited to the following:

  1. Brand Value: Every brand of 4 Stroke Bike Kit has a value all its own. Most brands offer some sort of unique selling proposition that’s supposed to bring something different to the table than their competitors.
  2. Features: What bells and whistles matter for an 4 Stroke Bike Kit?
  3. Specifications: How powerful they are can be measured.
  4. Product Value: This simply is how much bang for the buck you get from your 4 Stroke Bike Kit.
  5. Customer Ratings: Number ratings grade 4 Stroke Bike Kit objectively.
  6. Customer Reviews: Closely related to ratings, these paragraphs give you first-hand and detailed information from real-world users about their 4 Stroke Bike Kit.
  7. Product Quality: You don’t always get what you pay for with an 4 Stroke Bike Kit, sometimes less, and sometimes more.
  8. Product Reliability: How sturdy and durable an 4 Stroke Bike Kit is should be an indication of how long it will work out for you.

Romance University always remembers that maintaining 4 Stroke Bike Kit information to stay current is a top priority, which is why we are constantly updating our websites. Learn more about us using online sources.

If you think that anything we present here regarding 4 Stroke Bike Kit is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

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