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Engine, YX150 Modified 208cc Thumper X Engine (no externals), YX208

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  • YX150 Modified 204cc Thumper X
  • YX150 Modified 204cc Thumper X
  • Andrews Motorsports Building 3
  • Ultra Sonic Cleaner For Carburetors & Small Engine Parts
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  • Engine Assembly
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  • Welding Area
  • Chassis Fabrication
Thumper X
RRP: $2,150.00
$1,630.00 (You save $520.00)
Usually Ships In One Business Day

 Product Description


This is the 208CC Thumper X engine without all of the externals. This listing is for the engine only.  The Thumper X is a modified version of the YX150 with a stroker crankshaft, 67mm big bore cylinder, V2 Race head and a custom grind camshaft. This engine produces around RW 23hp on our dyno.

Note:  This product requires special packaging and handling for shipping.  Engines are shipped via FedEx Ground.  


High Performance, 4 up with clutch, any gear start 208cc 4 stroke 4 speed complete performance engine. A bolt in replacement or upgrade for the Honda CRF50 or XR50 series motorcycles.

  The engine comes with a high-quality cylinder head made from aluminum, and extra large valves and ports! 

Furthermore it comes with a high-quality 4-disc clutch! 

With 23 hp by 9500 rpm the engine reaches more than the 8 times performance of a standard CRF50 engine.


Single cylinder, 4-stroke, 2 valves, TB V2 racing head, oil cooled, 208cc 
Bore x Stroke: 67mm x 59mm

Dimension: 435mmx285mmx235mm
Displacement: 208
Compression Ratio: 11.0:1 
Ignition: CDI, 12 volt, permanent magnetic stator 
Maximum Power: 23 hp @ 9,500 rpm  
Torque: 14 @ 7,500 rpm  
Gears: 4-speed, manual clutch, START IN ANY GEAR! 1-N-2-3-4, 4 up.
Gear Ratios: 1st: 3.272(11/36), 2nd:1.937(16/31), 3rd: 1.350(20/27), 4th: 1.043(23/24)
Final Drive: 14 tooth #428 front sprocket

Lubrication: 1.1 liters, 5W/40 4-stroke motorcycle oil, pressure and splash 

Fuel: 90# up GB484-89 

 Warranty Information

No Warranty Is Expressed Or Implied. All Engines Are Test Ran On The Dyno Before Shipping.

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