S&S
S&S, 100"/107" 4" bore piston kit. Std
S&S, 100"/107" 4" bore piston kit. Std
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Replacement forged piston set. Fits all 100" and 107" 4" bore Super Sidewinder engines. Will also fit the special (out of production) 100" Evo type retro-fit engine for Shovel chassis; which is equipped with small diameter flywheels. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
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Why buy from Forty5°
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Verified compatibility
Every part we ship is checked against your bike's platform, year, and engine. If it doesn't fit, we tell you before you check out.
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Workshop installation
Book a serviceHave us fit it. Book installation at parts intake — same-day on most jobs, master techs only.
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Founder-led aftersales
Get in touchQuestions after fitment? You'll speak to the people who installed it. We answer email and WhatsApp seven days a week.