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ZXTDR

Lifan 140cc Engine Motor for XR50 CRF50 XR CRF 50 70 ATC70 Dirt Pit Bike Motorcycle | N1234 Gear 4 Stroke Racing Engine

  • Based on 49 reviews
Condition: New
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$489.99 Why this price?

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Availability: In Stock.
Fulfilled by ZXTDR
Arrives Aug 6 – Aug 8
Order within 23 hours and 58 minutes
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Features

  • High performance Lifan 140cc engine, N-1-2-3-4 Gear, manual clutch, 4 stroke 4 speed
  • Replacement upgrade for XR50 CRF50, 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.

Description

Specifications: Displacement: 140cc Type: Single cylinder, horizontal, 4-stroke, 2 valves, OHC racing head, oil cooledBore x Stroke: 55mm x 59mmMax. Power & Corresponding Speed: 8kw(7500±375)Max. Torque & Corresponding Speed: 9.5N.M(5000±250)Clutch Type: Manual clutcStarter: kick startIgnition: CDICompression Ratio: 9.47:1 Engine Oil: 900ml, 15W/40-SEGears: 4-speed, N1234, manual clutch, START IN ANY GEAR! 4 up!! Sprocket: 15T 428 CHAINDimension: 470 x 275 x 280mmWeight: 23kg Engine Kit including:1 x Lifan 140cc engine1 x Kick Starter Lever1 x Gear Shift Lever1 x intake manifold1 x Manifold hardware kit1 x Carburetor1 x Air Filter1 x Wire harness1 x CDI1 x Ignition coil1 x Clutch Cable

Manufacturer: ‎ZXTDR


Brand: ‎ZXTDR


Is Discontinued By Manufacturer: ‎No


Manufacturer Part Number: ‎U-TD202


Date First Available: August 2, 2017


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 6 – Aug 8

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

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Top Amazon Reviews

    • Great fit and tons of power
I used this as a replacement engine for my kids Honda xr 70. It bolted up perfectly and I only had to drill a new hole in the exhaust to bolt it back on to the back of the bike. The engine is a little bit longer than the original. Has a lot more power than we thought it would. Great engine for the price. ... show more
Reviewed in the United States on June 5, 2022 by Tom A.
    • Incompetent
I did not receive any of the parts that were needed to make this motor run all that came in the package was the motor
Reviewed in the United States on May 31, 2025 by Roy goodin
    • Good upgrade
Poppin wheelies now, chinese pitbike can scoooot
Reviewed in the United States on February 15, 2021 by J S
    • Be careful with kick start
Was fun until kick start broke on inside but can kick sometimes when it does start it is lit
Reviewed in the United States on January 18, 2025 by Drueski
    • Lifan 140 install
Review Image by Bob T. Bob T.
Replaced the 125 in my Apollo Z20. The upper mount bracket on the Apollo needed to be ground a little for clearance. Other than that the 140 bolted right in. Needed to use the included wire harness and coil for a plug and play. Engine runs and shifts great with good power.
Reviewed in the United States on September 6, 2021 by Bob T. Bob T.
    • FALSE ADVERTISING.!, update.! TO THIS VERY F-IN DAY IT SITS IN MY GARAGES
Review Image by michael michael
Number one : it was NOT disassemble, then just " reverse - it " to install. Number : 2 Im on my 3rd day of my install cutting & deleting things such as breaks, etc. AND AS OF RIGHT NOW ( disclaimer ) im mechanically inclined. BUT HOLY CRAP, THIS JOB RIGHT HERE...IM AFRAID I'VE BITING OFF MORE THAN I CAN CHEW..!! I've gotta re-route my breaks, the kick-start, & and you see how ive gotten & yet to hear it run.OH NOT TO MENTION re- routining the engine exhaust.! (sighs) i even did research before i made my purchase & no one ive seen online has ran across the issues that I've had. ::UPDATE:: ITS FULLY INSTALLED, AND NOW THE CLUTCH IS CONSTANTLY ENGAGED EVEN WHEN I SQUEEZE THE CLUTCH IN ..MOTOR AN TRANSMISSION STIL PULL I DONT UNDERSTAND.! I TELL YOU A BIG MISTAKE BUYING THIS ENGINE ONE HUGE PROBLEM AFTER PROBLEM.!! Update: TO THIS VERY DAY IT STILL SITS IN MY GARAGE..VERY F-IN DISGUSTED.!!!!! I DON'T WANT...WISHED I COULD HAVE MY MONEY BACK.!!!!!!!!!!!!!!!!!!!!!!!!! ... show more
Reviewed in the United States on January 6, 2021 by michael michael
    • Fits apollo rfz 110
Very good engine started 3rd kick out of the box had some clutch troubles byt overall a good choice so far
Reviewed in the United States on December 19, 2023 by Lance Cosby
    • Check timing
Review Image by Boston Boston
Review Image by Boston Boston
Box came a little beat up but nothing damaged. With new engines you must check timing and valve lash they are not set right from factory. Valves are to right and my timing was off a tooth. Did not come with carb bolts for the nuts but the bag was ripped in the box. Besides that pretty nice. Haven’t started it yet. ... show more
Reviewed in the United States on February 2, 2022 by Boston Boston

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