KTM RC390 STANDARD BORE/Ceramic Coated Dome (89mm) HIGH COMPRESSION RACE PISTON 13.0.1

Description

Spears Racing KTM RC390 standard bore/Ceramic Coated Dome (89mm) high compression race piston has a compression ratio of 13.5 to 1.  Spears Racing has been designing and making race pistons with the State of the Art CNC Machining and manufacturing alliances with JE Pistons for decades. Spears Racing continuous committed to excellence to advance as the industry changes. This commitment has resulted in more forgings specific to certain applications, proprietary treated wrist pins and piston rings manufactured only for us. Each of these aspects has been put through stringent research and development stages to ensure that our product will exceed your standards. The Spears Racing  KTM RC390 standard bore (89mm) high compression race piston has a special under-crown machining to reduce the weight to be closer to the OEM Piston weight.

KTM RC390 373.2 cc Piston Kit: This is the new 3 Ring  asymmetrical FSR Forging made for Spears Racing by JE Pistons. This race piston  kit includes piston, rings (Steel Gas Nitrided Barreled Faced), lighter tapered wrist pins, cir clips . The compression is 13.5 to 1. At the forefront of performance, piston manufacturing has been a result of continuous research and development of unique materials, piston designs and technologies. Utilizing State of the Art CNC machines for manufacturing, along with purpose-designed forgings, while being able to maintain exacting specifications on each and every piston – holding tolerances to millionths of an inch. This is the new forging that is lighter Pistons.

Thermal Barrier Crown Coating

Heat is a major reason for decreasing a piston’s lifespan. JE has developed a proprietary ceramic gold crown coating that is applied in-house and rejects a large portion of the damage-causing heat piston crowns are subject to.

“Typically”, a piston gets annealed, or softens, over time due to heat cycling. The crown of the piston pulls a lot of heat into it. At some point there is a life cycle to aluminum. The softer the piston gets, the more it will take on an umbrella shape. Then comes end of life.

When all things are operating properly in the engine, the ceramic gold coating gives the crown virtually an unlimited lifespan without any issue of the piston annealing.

Applied to the top of the piston and is designed to reflect heat into the combustion chamber, thereby increasing exhaust gas velocity and greatly improving scavenging potential. The .0015” thick coating can also assist in extending piston life by decreasing the rate of thermal transfer.

Spears Racing Piston Kits have been winning races and Championships all over the world for over 4 decades. Spears Racing pistons have been in several of the race wins in close course racing and in road circuits in Europe and has won the Isle Of Man TT Twins several times.

“PREFERRED PERFORMANCE” PISTONS KITS BY SPEARS RACING”

KTM RC390 373.2cccc Pistons Includes the Following:

Piston x 1
Tapered Wrist Pin x 1
Piston Rings x 1
Cir Clips x 2

Piston Weight: 256 Grams (This piston is lighter than other companies currently on the market)