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Works - Lifan 141cc Semi-Auto Engine

Vital Information
Part No TRC-5070
Stock Level 1 Left
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**Signature required shipment**

Note: Each engine is built to order. Please allow 1 week lead time before the engine can be shipped.

Works engine build!

Key Features:

  • Ready to rip (tuned and cycled motor)
  • Added power 
  • Lower weight 
  • 50% stronger clutch 
  • Base engine - Lifan 125cc semi-auto engine
  • Added 141cc aluminum cylinder big bore kit - TBW9067
  • Added TB 9004 race cam - TBW9004
  • Added  TB H-D auto clutch kit - TBW0961
  • Added 26mm VM26 Mikuni carburetor and matching intake kit
  • Approximately 45 lbs with oil  
  • Front drive sprocket included (Takes Larger Shaft 20mm x 17mm Type) 

Kit Includes:

  • Engine
  • Intake
  • CDI
  • Coil
  • Harness
  • Kicker
  • Shifter

Displacement 141cc
Engine Type Air Cooled, Single-Cylinder, 2-valve, 4-stroke
Bore/Stroke 55mm x 57mm
Final Drive Chain
Fuel Delivery VM26-606 26mm Mikuni
Fuel Unleaded / 91 Octane
Recommended Engine Oil 10W-40 Petroleum Based (Nonsynthetic)
Kick Start Yes
Electric Start No
Auxiliary Output Yes
Transmission 4-Speed semi-auto
Shift-Pattern Four-speed Transmission: N-1-2-3-4 (Four Up)
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 available individually at TBoltUSA.com

$100 shop labor included
$100 test run and tune


  • 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:


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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.