The 2026 Yamaha GP HO is a quick stock ski, and with basic upgrades many riders report roughly a 5 mph top-speed gain. A commonly cited stock figure is about 65 mph , with a simple stage-1 style setup often pushing it into the high 60s depending on conditions and rider weight.

Quick Scoop

The GP HO is built around Yamaha’s 1.9L naturally aspirated engine and is aimed at strong acceleration and race-style handling rather than extreme top- speed numbers. In real-world use, “how fast” depends a lot on water conditions, fuel load, altitude, and whether the ski is still restricted or fully optimized.

Stock speed

  • One dealer listing for the 2026 GP HO says it can reach up to 65 mph.
  • Yamaha’s GP HO platform uses a 200 hp 1.9L engine, which is designed for strong pull and responsive acceleration.
  • Forum chatter around similar Yamaha HO setups suggests these skis feel especially quick in the midrange, even if the top speed is not dramatically higher than other naturally aspirated models.

Upgrade effect

A popular stage-1 style package for Yamaha FX/GP/VX HO 1.9L models is advertised as adding about 5 mph of top speed. That lines up with forum comments claiming a mild build can move a GP HO from the mid-60s into the upper-60s, while bigger gains usually need more serious engine work.

What to expect

  • Stock: around 65 mph.
  • Basic intake/exhaust/tune type upgrade: roughly +3 to +5 mph.
  • Heavy build or forced induction: much bigger gains, but that is a different level of cost and complexity.

Bottom line

For a 2026 GP HO, “fast” usually means about 65 mph stock and around 70 mph with mild upgrades under good conditions. If you want, I can turn this into a cleaner forum-style post with a title, subheads, and a short SEO meta description.