GSX-R1000 Camshaft Showdown: ST-R vs ST-1
By Yoshimura R&D of America, Inc. | Published: 2026-10-28
Category: Comparisons
Compare Yoshimura ST-R and ST-1 camshafts for the GSX-R1000: lift, duration, valve springs, and class legality to pick the right upgrade.
Quick Answer
For a GSX-R1000 (2017-25) aiming at MotoAmerica Superbike Cup, the ST-R camshaft set is the choice; for earlier Hayabusa models, the ST-1 cams offer a solid lift and duration upgrade without the extra valve spring complexity.
What the Specs Tell You
The ST-R set for the GSX-R1000 (2017-25) includes intake and exhaust camshafts plus a set of outer and inner intake valve springs. It also uses an exhaust cam sprocket type ST-R, and you must use the genuine cam sprocket assembly (SR-VVT) for the intake side. That means the kit is designed to work with the bike's variable valve timing system, which is critical for proper installation.
The ST-1 camshafts for the Suzuki Hayabusa (2008-12) are ground from billet blanks, not welded or reground stock units. They offer a more moderate lift and duration profile, and the recommended parts list includes a valve cotter set, suggesting a careful assembly process.
Installation and Compatibility Considerations
Both cam sets require professional installation. The ST-R set explicitly notes that cam timing should be set by a qualified mechanic, and the ST-1 cams also carry a similar warning. You'll need to check your bike's specific model year and existing valve train components before ordering.
The ST-R set is approved for use in MotoAmerica's Superbike Cup class, which is a strong signal for racers who need to stay within class rules. The ST-1 cams, while not class-specific, are a proven upgrade for Hayabusa owners looking for more top-end power without going to a full race setup.
ST-R vs ST-1: Trade-Offs at a Glance
- Power vs. Complexity: The ST-R set delivers more aggressive lift and duration, but it requires the intake side to use the genuine SR-VVT cam sprocket and comes with heavier valve springs. The ST-1 is simpler, with no special sprocket requirement, but it offers less peak lift.
- Class Legality: If you race in MotoAmerica Superbike Cup, the ST-R set is approved. The ST-1 cams are not listed for that class, so check your series rules before choosing. Always verify class legality before purchasing.
- Valve Train Upgrades: The ST-R kit includes intake valve springs, so you don't need to source them separately. The ST-1 cams do not include springs, and the recommended parts list includes a valve cotter set, so plan for additional purchases. Factor in the cost of extra parts when budgeting.
Product Facts
- GSX-R1000 2017-25 ST-R CAMSHAFT SET: Includes intake and exhaust camshafts, intake valve spring set (outer and inner), and exhaust cam sprocket type ST-R; max lift 11.3mm intake / 9.2mm exhaust, duration 250° intake / 258° exhaust. The higher lift and longer duration, plus the included valve springs, are aimed at serious race use where the engine can handle the extra stress and the class rules allow it.
GSX-R1000 2017-25 ST-R CAMSHAFT SET - SUZUKI HAYABUSA 2008-12 Camshafts ST-1: Intake lift 9.5mm, duration 249°; exhaust lift 8.7mm, duration 235°; standard tappet clearance 0.20mm intake and exhaust; ground from billet blanks. The more moderate profile is a practical upgrade for street or track Hayabusa riders who want improved mid-to-top range without needing a full valve spring upgrade.
SUZUKI HAYABUSA 2008-12 Camshafts ST-1
Which Cam Set Fits You?
Best For
- GSX-R1000 (2017-25) owners racing in MotoAmerica Superbike Cup or other classes that allow the ST-R set
- Riders who want a proven race-ready cam package with valve springs included
Not For
- Suzuki Hayabusa (2008-12) owners – this set is not designed for that model
- Street riders looking for a mild, low-maintenance upgrade – the ST-R's aggressive profile and spring requirements are overkill for daily use
