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The S&S Cycle MK136 Black Edition engine is a high-performance powertrain designed specifically for M8 Touring models, offering race-oriented features and enhanced durability. This engine features high-flow cylinder heads equipped with premium seats, guides, valves, springs, and seals. The +1.00 mm oversized intake and exhaust valves improve airflow and combustion efficiency, while valves are 0.030 inches longer than stock to optimize valvetrain geometry for better performance and reliability. The cylinder heads include an enlarged cooling passage around the exhaust seats to maintain optimal operating temperatures during demanding use. Additionally, exclusive breather boxes from S&S help ensure proper crankcase ventilation, contributing to engine longevity. The engine is equipped with a 0.605-inch maximum lift valve spring and a 550G gear drive cam, providing aggressive power delivery suitable for race applications. The crankcase features patented dual-spray piston cooling jets for efficient heat dissipation, a precision-machined oil scraper to maintain clean oil flow, and an enlarged oil sump with a contoured floor that facilitates easy oil drainage back to the sump, supporting sustained high-rpm operation. The MK136 package retains stock engine height, ensuring compatibility with standard chassis configurations while delivering significant performance upgrades. It includes forged pistons, a performance oil pump, cam support plate, premium tappets, tappet cuffs, billet aluminum covers, sprocket shaft spacer, Champion spark plugs, and a cam cover badge—all made in the USA. Designed for race-only use, this engine is a comprehensive upgrade that combines advanced engineering and durable components to maximize horsepower and reliability for serious riders seeking top-tier performance. Whether for track days or high-performance street riding, the S&S Cycle MK136 Black Edition engine offers unmatched quality and power tailored for M8 Touring models.
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