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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 54 reviews
Condition: New
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$489.99 Why this price?

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Availability: In Stock.
Fulfilled by ZXTDR
Arrives Aug 1 – Aug 3
Order within 17 hours and 20 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


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 1 – Aug 3

This item is non-returnable:

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

View our full returns policy here.

  • Klarna Financing
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  • Zip Pay in 4
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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

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.
    • FALSE ADVERTISING.!, update.! TO THIS VERY F-IN DAY IT SITS IN MY GARAGES
Review Image by 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
    • Engine cc140 lifan
Shredded a few kick start levers. Messed up the splines on the engine side, as well. Not too hurtful to replace on these. I love the engine though. Sounds good and boogies
Reviewed in the United States on June 8, 2026 by GirthMeatLog
    • Perfect
Review Image by M. Benson
I got the package from usps and it looked like they rolled it down the stairs and urinated on it Thank goodness the seller packaged it awesome This engine is awesome
Reviewed in the United States on June 18, 2022 by M. Benson
    • It is a scam
Received only the engine itself, with nothing else that was advertised in the listing. For the amount of money spent on this product, the fact that it does not come with ANY of the necessary parts to run is a shame. Absolutely do not buy this product, it is inaccurate and it is a lie
Reviewed in the United States on August 9, 2025 by Anastasia
    • 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
    • Good upgrade
Poppin wheelies now, chinese pitbike can scoooot
Reviewed in the United States on February 15, 2021 by J S
    • Lifan140 😍😍
Love it can’t complain
Reviewed in the United States on August 22, 2021 by Ulises

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