High Performance Piston Kit A


Bonneville Performance offers the Wiseco 904cc, 10.5:1 compression 92mm bore piston kit designed for all Triumph powered twins post 2001 for street application. We offer this as Option A: 904cc Piston Kit (without exchange cylinders). A $45 USD Shipping & Handling fee is added automatically at checkout. All shipping is USPS 2 Day Priority Mail. Use the Contact Form to email us about international shipping costs and options.



This Bonneville Performance/Wiseco High-Performance piston kit requires the following engine modifications and components:

  • BP/Wiseco 904cc Piston Kit
  • Barnett Clutch & Spring Kit
  • Bore & sleeve factory cylinders
  • This kit will produce 70 – 78 HP and 62 – 66 ft. lbs. of torque*

* NOTE: To optimize the performance of this modification, we recommend a flat-slide carburetor kit, hi-flow head with 1mm over valves and a free-flow exhaust system. See our: Mikuni Flat Side carb kitHigh-Performance Heads and 2 into 1 stainless steel or mild steel exhaust system options.

Engine building services are available

We charge a $500.00 flat rate plus shipping costs (shipping costs depend on the distance and service you use) if you ship us your engine to rebuild to the specifications you have ordered.

Additional information


790, 865, 904


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