Different power valves
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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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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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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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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
