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YUMINASHI R250X CAMSHAFT (W110 TYPE 2012-2020)

Brand : YUMINASHI

฿3,500.00
SKU:
14100-KWW-250RX
Availability:
Usually shipped out on Mondays & Thursdays (Except on Thai public holidays)...
Weight:
350.00 Grams
Minimum Purchase:
1 unit
Shipping:
Calculated at Checkout
Bulk Pricing:
View Details

buying-2-discount-300pxl-.png● YUMINASHI R-250X CAMSHAFT (CRF110F / DREAM SUPER CUB / W110i) (14100-KWW-250RX) 

● This 250° camshaft comes complete with bearings installed, but without the decompression system to make higher RPM's possible...

● You can see the cam details from this R-250X camshaft in the cam guide below, and this makes it easy to compare the details from this camshaft to the other camshafts we have available...

● YUMINASHI CAMSHAFT GUIDE FOR W110 2012-2020 ENGINE TYPES (CRF110F | DREAM110 | SUPER CUB110 | ETC...):

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● Matching Camshaft Duration to Engine Displacement: > A short-duration camshaft performs predictably when paired with a stock piston and stock valves. However, if you upgrade to a larger piston while retaining the stock cylinder head, the factory-sized valves become a restriction. To maintain volumetric efficiency and allow the engine to breathe, you must select a camshaft with longer duration (more degrees). This keeps the valves open longer to fill the larger cylinder volume. Because the valve area remains restricted, this longer-duration profile will still act as a highly effective, torque-focused camshaft in this specific configuration.

● Big Bore / Stock Head Considerations: > When running a big bore kit with a stock cylinder head, you must compensate for the factory valve size. While low-degree cams are ideal for completely stock engines, a larger displacement engine needs more time to draw in air. Choosing a camshaft with longer duration keeps the valves open longer, eliminating the bottleneck. In a big bore/stock valve setup, a higher-degree camshaft acts as a massive torque multiplier rather than a high-RPM peak power cam.

● Camshaft Tuning Rule of Thumb: > Always view your engine as a complete system. If you increase piston size but keep your stock valves, you restrict airflow. To correct this, select a camshaft with increased duration (larger degrees). The extended valve-open time allows the larger cylinder to breathe properly. Due to the stock valve size, this longer duration will translate directly into a strong, torque-heavy powerband.

※ Chief Engineer's Note: Since increasing the duration and the bore size significantly changes the cylinder filling dynamics, it will also alter the engine's volumetric efficiency curve and lean out the air/fuel mixture.

⚠️ IMPORTANT: VERIFY VALVETRAIN CLEARANCES BEFORE ORDERING

Please review the Intake and Exhaust Base Circle and Valve Lift specifications carefully.
High-performance camshafts require precise tolerances. Before placing your order, you must ensure that:

  • Casting Clearance: The camshaft can physically rotate 360 degrees within your cylinder head without contacting the casting.

  • Coil Bind: Your valve springs can safely accommodate the increased valve lift.

  • Piston Clearance: You have adequate piston-to-valve clearance at maximum lift and overlap.

※ Note: We cannot accept returns or take responsibility for fitment issues or engine damage resulting from a failure to check these clearances. Always measure your specific setup before finalizing your order.

budget-logo-2.png SMART SHOPPER TIP:

       ※ BUYING MORE THAN 1 PIECE CUT THE TRANSPORT PRICE, AND YOU RECEIVE A 10% DISCOUNT ON TOP OF IT!

   ※ B2B:  

  • Purchases between 2 & 4 pieces of this product will receive a 10% DISCOUNT 
  • Purchases between 5 & 9 pieces of this product will receive a 15% DISCOUNT 
  • Purchases between 10 & 19 pieces of this product will receive a 20% DISCOUNT 
  • Purchases between 20 & 30 pieces of this product will receive a 25% DISCOUNT
  • Purchases between 31 & more pieces of this product will receive a 30% DISCOUNT

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