TPR Racing 84mm 305cc Big Bore Kit for Honda CBR 250R (MC41)

TPR Racing 84mm 305cc Big Bore Kit for Honda CBR 250R (MC41)

SKU #: TPR-1003
TPR Racing 84mm Big Bore Kit that will increase the displacement of a Honda CBR 250 to 305cc!
$450.00 In stock


Availability: In stock

TPR Racing 84mm 305cc big bore kit for Honda CBR 250! Unlike many smaller displacement kits on the market that reuses bore out OEM cylinder, TPR Racing BBK is made entirely from their own cylinder casting! Direct bolt in! No machine work is required on the engine case. High quality BBK that will give you the best bang for the bucks performance!


  • Cylinder head gasket 84 mm
  • Cylinder block gasket
  • Cylinder block with special Nikasil coating 
  • Piston 84 mm
  • Piston ring
  • Piston wrist pin 
  • Circlip 2 pcs





Aftermarket fuel controller and/or upgraded fuel injector is required. Professional installation is highly recommended!



NO WARRANTY ON RACE ENGINE parts or engine bore up kits.  There is no warranty stated or implied due to the unusual stresses placed on these parts and because we have no control over how they are installed and used.  Steady Garage will not be held liable for any failure or damage caused directly or indirectly from use of these products or engine.  The installation and use of these products or engine shall be conclusive evidence that the user assumes full responsibility for any damage caused directly or indirectly by their use.


This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways). Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways. Not legal for vehicles registered and use in California. 

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