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Yamaha Mountain Max & Sidewinder Upgrade & Fitment Guide

Freshies Built stocks upgrades for Yamaha sleds: the Mountain Max 800, the Sidewinder 998 Turbo, the SR Viper, and the SnoScoot. Several Yamaha models share their engine and chassis with Arctic Cat sleds, so many of these parts are listed for both. This guide sorts them by what they do and calls out which Yamaha each one fits. Not sure what fits yours? Send us your model year and model and we'll confirm before you order.

Step 1: Know which Yamaha you have

Before you order, check which Yamaha you have:

  • Mountain Max 800: Shares parts with the Arctic Cat M 8000 / Alpha One and Ascender. Look for listings that name "Mountain Max 800" or "Ascender / Mountain Max."
  • Sidewinder 998 Turbo: Shares many performance parts with the Arctic Cat ZR / XF 9000. Look for listings that name "Sidewinder."
  • SR Viper and older Nytro / Apex: Have their own exhaust and rail kits, listed by model and year.

Mountain Max 800: clutching and power

Stage kits pair clutch calibration with matching parts, so the sled stays tuned after you add power.

See all stage kits →

Mountain Max 800: exhaust

See all exhaust →

Sidewinder 998 Turbo

Shocks and front suspension

See all shocks → · Front suspension →

SR Viper, Nytro, Apex and SnoScoot

See all rails and rear suspension →

Yamaha upgrade FAQ

Do Arctic Cat parts fit my Yamaha?

Some do. The Yamaha Mountain Max 800 shares parts with the Arctic Cat M 8000 / Alpha One and Ascender, and the Sidewinder shares many performance parts with the Arctic Cat ZR / XF 9000. Only order parts whose listing names your Yamaha model.

What should I upgrade first on a Yamaha Mountain Max 800?

Most riders start with clutching and weight: a SPEEDWERX stage kit or Hypershift clutch kit matched to the model year, plus a lightweight muffler. Then look at shocks and front-end parts like the IceAge Alpha / Mountain Max Elevate.

What fits a Sidewinder 998 Turbo?

We list SPEEDWERX stage kits, L2 mufflers and straight pipes, GGB mountain and trail mufflers, and the IceAge Sidewinder X-TX rail kit for the Sidewinder. Check the model years in each title.

How do I confirm fitment before I order?

Check the model years, engine and model in the product title. If you're unsure, contact us with your model year, model and track length and we'll confirm.