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Black Lifan 125 4 UP SEMI-Auto Engine
With Option For Carb & electrical

Vital Information
Part No WHS-4190
Stock Level In Stock
Choose Options

Black Lifan Full Kit with Optional Carb and Electrical for an additional fee.

This is a very solid performing engine.

Great Replacement engine or for builds & Projects.
Front Drive Sprocket Included

Displacement 124cc
Engine Type Air Cooled, Single-Cylinder, 2-valve, 4-stroke
Bore/Stroke 54mm x 54mm
Final Drive Chain
Fuel Delivery 22mm Carb
Fuel Unleaded / 91 Octaine
Reccomended Engine Oil 10W-40 Petroleum Based (Nonsynthetic)
Kick Start Yes
Electric Start no
Auxillary Output Yes
Transmission 4-Speed Semi Auto
Shift-Pattern Bottom Neutral - Four UP transmission N-1-2-3-4
Clutch semi - auto (no hand clutch)

When upgrading your Honda XR50/70 ,CRF50/70 to this engine you
may want to use order aftermarket footpeg mounts and tank spacers.
Also we suggest using an aftermarket exhaust to obtain maximum performance.

All of these items are availble at TBoltUSA.com

Front Drive Sprocket Included
(Takes Larger Shaft 20mm x 17mm Type) 

Additional CARB and Electrical option includes:

  • WHS-0957 - MIKUNI 22MM CARB
  • TRC-0116 - Wiring Harness
  • TRC-0082 - Standard CDI
  • TRC-0410 - Coil

Available Options:


  • You may want to consider setting up the bike on a stand for a solid starting location at first until your confident
  • Turn on Both Fuel and Choke
  • DO NOT open the throttle (do NOT turn the throttle)
  • Move the starter down until it gets stiffer, your looking for top dead center
  • Let the starter come back up and give a full strong swift kick ALL the way thru
  • REPEAT (If necessary)
  • When warm just do not use the choke

Flooded Engine:
IF your flooded , pull the plug, kick it over about 10 times WITH THE PLUG OUT
Put in a NEW PLUG

For ease of starting:
You may want to consider our TRC EZ START HIGH PERFORMANCE CDI
Part No. TRC-9745

One more thing:
At times it helps to just crack the throttle a tiny bit to let air in.

Available Options:

Air Filter:

Carb and Electrical:

Exhaust Gasket:


(3 Reviews)

Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online Pit Bike Technical Info Database!

We have all necessary support parts on hand.

Most orders ship same, or next business day, unless otherwise noted above.