Triumph T120 Big Bore Billet Piston Set

M.A.P. Cycle Billet Piston Kits for Routt, Morgo, Aerco, Chatland and MAP BIG BORE cylinders.  Not for OEM cylinder use.

• Hi-Silicone, low expansion, Hi-Strength 4032 aluminum alloy.  The ultimate for severe use in air cooled engines.
• 100% CNC Machined, utilizing the latest “Solid Works” CAD design. This allows for consistent cross-section providing the most even heat distribution with the highest weight reduction (lightest commercially available piston kits for less vibration).
• Lo-Dome "Tight Quench" design for efficient flame travel and combustion (9.5:1 compression ratio and higher)
• Zero Deck design for max power while minimizing octane requirements (9.5:1 compression ratio and higher)
• 2nd Ring-Land "Accumulator" groove to prevent unloading of the top ring from trapped blow-by.
• Tapered wrist pin (I.D.) for rigidity and weight reduction
• “Micro Groove" piston skirt for high scuff resistance.
• Race Type "SpiroLoc" clips for reliability - Won't come out
• Latest piston cam design reduces noise, and increases life better than any other commercially available vintage Brit Bike piston kit.

Updated wrist pin oiling:

• 4 location pressure fed wrist pin oilers
• Increases oil volume to pin
• Dual clocked pin bore grooving holds and disperses the oil around the wrist pin
• Minimizes heat buildup to prevent galling between the small end of the rod and the wrist pin

Race proven ring pack features:

• Perfectly round making these the best sealing, quickest seating rings available.
• Modern sizing for the least amount of friction with the most amount of heat transfer for cooler running pistons.
• 1.0mm Nitrided Stainless Steel Barrel-Face Top Ring
• 1.2mm Ferrox Cast-Iron Napier 2nd
• 2.8mm Nitrided Stainless Steel Rails with expander (3 piece design)

Note:  Stated compression ratios are an approximation, and are dependent on several variables such as base and head gasket thickness, and any modifications that changes combustion chamber volume such as valve recession, valve sizing, and head surface milling.

Designed by, and exclusively manufactured for M.A.P. Cycle thru sources in the U.S.A.