Powervalve Adjuster with Compression Spring – KTM 65 SX / Husqvarna TC65 / GasGas MC65 (2009–2026)

The VHM DA31153 powervalve adjuster is engineered for peak performance and adjustability in competitive 65cc motocross bikes. It’s crafted from high‑quality machined aluminium, and features a compression spring (often two‑stage) allowing the powervalve to respond quickly and fully — the first stage offers rapid opening for better throttle response, while the secondary stage supports full open flow for maximum exhaust efficiency.  Compatible with both OEM cylinder head/powervalve bases and VHM’s own heads and bases (e.g., VHM AA33112 and power‑valve base DA31181).  Ideal for riders upgrading exhaust systems, modifying their engine for racing or simply wanting better powervalve behaviour and tuning flexibility. The broad fitment range (KTM 65SX 2009‑2025, Husqvarna TC65 2017‑2025, GASGAS MC65 2021‑2025) ensures this adjuster is suitable for current and recent bikes. 

Key Features / Benefits:

• Complete powervalve adjuster designed for VHM DA31153 with compression (two‑stage) spring — offers better opening and flow control.

• Machined from solid high‑quality aluminium for durability in off‑road and motocross conditions.

• Allows precise adjustment (via screw) of powervalve opening timing to match exhaust pipe, chassis dynamics or track conditions. 

• Fits a wide range of 65cc machines: KTM 65SX (2009‑2025), Husqvarna TC65 (2017‑2025), GASGAS MC65 (2021‑2025) — ensuring long term compatibility. 

• Compatible with both VHM’s own cylinder head and power‑valve base, as well as OEM parts, offering flexibility in rebuilds and upgrades.