High Compression Piston Kit for 790-865cc Air-Cooled Engines

$440.00$640.00

Bonneville Performance offers these Wiseco 90mm pistons, at 12:1 compression for the Triumph Bonneville Twin air-cooled 790-865cc engines. As an option, we can send you the pistons fitted with exchange cylinders, if you send us your cylinders in exchange. A $72.00 USD Shipping & Handling fee is added at checkout. All shipping is USPS 2-Day Priority Mail. Use the Contact Form to email us about international shipping costs and options.

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REQUIREMENTS FOR MAXIMUM PERFORMANCE

This Bonneville Performance/Wiseco High Performance 90mm 12.5:1 piston kit for the 2005 through 2015 air-cooled twins requires the following engine modifications and components to maximize performance:

  • BP/Wiseco 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 $750.00 flat rate for top end builds and $1500.00 for crankshaft up builds 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

Options

Just the Piston Kit, Exchange my Cylinders

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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.