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    Different power valves

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    • jimmydc98
      jimmydc98 last edited by

      843746B1-7CF7-4FDB-B010-D9A1CB4C21EC.jpeg

      Does anyone know if these 2 are compatible in the same cylinder they both say 3bn and the one without the o rings next to the exhaust came from a 3mb cylinder

      There is also a variation on the powervalve head I presume the diamond shape was mainly on UK models with the fixed powervalve so they could restrict power and then you could change it yourself from the 2 different settings where’s the rectangle one would only go in one way but I may be wrong

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      • Calum
        Calum last edited by

        I know the powervalves you get from the 3BN cylinders are not interchangeable with other cylinders.

        Those valves look wildly different so I'm not confident to say they both fit properly.

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        • S
          SpookDog @jimmydc98 last edited by

          @jimmydc98

          The diamond shape is irrelevant, the power valve never had a servo pulley fitted to it. You can position the valve where you want then tighten it up with the end bolt. If you fit a servo you need to change the ( gear lever side) bush to allow for rotation. Otherwise it clamps the power valve...

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          • Nottsbiker
            Nottsbiker last edited by

            As mentioned the diamond shape fits the pulley with the square / rectangular end as well

            The grooves in the power valve aren't for O-rings, instead these fit into the ends caps as you cant refit the valve into the cylinder with O-rings in the grooves 😉

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