2021 Yamaha Mountain Max 800 — Should You Buy One?
Typical asking price: $9,000–$13,000. There are 2 high-severity known issues you need to know before handing over a check.
Kestrel Take
Yamaha's return to a two-stroke mountain sled (built with Arctic Cat, sharing the 794 C-TEC2) after years of four-strokes — light and capable for deep snow. It carries the two-stroke and Arctic-Cat-network considerations rather than Yamaha's usual four-stroke durability. Verify support and engine history.
What we checked
No public record to reconcile against
We don't yet have a public record to check this one against. ATVs and snowmobiles are not in NHTSA’s database — they fall to the Consumer Product Safety Commission, which publishes recalls but no owner-complaint record. What follows is our own write-up, and it has not been reconciled against an official record. Treat it as a starting point, not a verdict.
Known Issues for the 2021 Yamaha Mountain Max 800
Ranked by wallet impact. These are documented, recurring problems — not freak accidents.
The shared C-TEC2 two-stroke needs periodic top-end service; verify hours and history.
Repair cost (estimate): $400-$1,500
Source: not yet checked against public records.
Inspect the belt and clutch.
Repair cost (estimate): $100-$450
Source: not yet checked against public records.
Parts and service span Yamaha and Arctic Cat networks; verify local support.
Repair cost: Not yet priced
Source: not yet checked against public records.
Inspect the paddle track and running gear.
Repair cost (estimate): $200-$1,000
Source: not yet checked against public records.
Walk-Away Red Flags
- ✗No top-end history
- ✗Glazed belt
- ✗No local support
- ✗Running-gear damage
Good Signs
- ✓Documented engine and belt service
- ✓Local support available
- ✓Good running gear, reasonable hours
Found a specific Yamaha Mountain Max 800?
This page covers what goes wrong on the 2021 Yamaha Mountain Max 800 in general. The Kestrel report covers this specific car— the asking price vs. market, the photos, the seller's description, and a BUY / NEGOTIATE / WALK AWAY verdict with a negotiation script.
Get My Verdict — $7.99No account required. Delivered to your inbox, usually within minutes.
Not ready to pay for one? The free read is instant and needs no card — it checks the asking price against the market and names the top issues for this year. It stops short of the verdict, because that needs the photos.
Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
More from Yamaha
Similar snowmobiles
2022 Arctic Cat Riot X 8000
$9,000–$13,000
2021 Ski-Doo MXZ X 600R E-TEC
$9,000–$13,000
2021 Yamaha Transporter 800
$9,000–$13,000
2022 Arctic Cat ZR 8000
$9,000–$13,000
2020 Ski-Doo Renegade Adrenaline 900 ACE
$9,000–$13,000
2022 Ski-Doo Summit X 850
$9,000–$13,500
2022 Polaris Matryx Slash 850
$9,500–$13,000
2020 Polaris Titan 800
$8,500–$13,000
No bullshit, no upsells, no affiliate links. One report, one price — we'll never charge you rent for your own thinking.
Think we got something wrong? Tell us — a real person reads every message.