Ski-Doo Alpine 399 Snowmobile (1970-1971)

The Ski-Doo Alpine 399, produced from 1970 to 1971, is an iconic snowmobile powered by a 399 cc two-cylinder engine. This engine, with a precise displacement of 398.6 cc, featured an 8.75:1 compression ratio. While exact horsepower figures are not consistently documented, a similar 399 cc engine in the 1971 Olympique was rated at 24 horsepower. During these two years, the Alpine 399 was available in two main trims: the 399R, likely denoting a standard or manual start version, and the 399ER, which offered an electric start option. There were no significant mid-cycle generation or engine changes for the Ski-Doo Alpine 399 between 1970 and 1971. Core specifications and design remained consistent, with period documents often grouping these two years for technical information, confirming continuity in the platform. FAQ:

Q: How can I ensure this part is compatible with my Ski-Doo Alpine 399?

A: To guarantee compatibility, please use the year and edition selector available on this product page. Q: Are there major differences between the 1970 and 1971 Alpine 399 models?

A: No, available information indicates no significant generation or engine changes between these two years. The primary distinctions relate to starting options (manual or electric).

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