TTP 904S Sports Pistons


  • 12:1 compression ratio.
  • Tight quench to improve turbulence, combustion burn & eliminate pinking.
  • Anti-friction coating on the piston skirts.
  • Pistons hand balanced to within 0.1gms of each other.
  • Hand gapped piston rings.


There are very few modifications you can perform on an engine that will improve power and torque right through the rev range, but TTP’s 904s big bore pistons are one of those modifications. Increasing cubic capacity and compression ratio give improved performance from idle to the rev limit, with no downside.

In use the extra top end horsepower is excellent for acceleration and top speed, but the revelation is the extra torque through out the rev range. It makes riding a Triumph twin far more exiting as when you open the throttle, the engine just pulls and pulls to the red line.

Designed by TTP, the 904s high compression race pistons come with exceptional quench properties for powerful combustion, as well as valve pockets to except +3mm inlet valves and +4mm exhaust valves. These are the best pistons that have every been available for power, torque and reliability.

ONLY to be used with NIKASIL Coated barrels.

Available for all the air cooled Triumph twins. Bonneville, Thruxton, Scrambler, America and Speedmaster from 2001-2016.

Additional information

Weight 3 kg
Dimensions 20 × 10 × 8 cm