They are pretty good on reed valves, but not the reed cage which chips and then the steel reeds crack and break. Find some better cages and put in boyesen or spi reeds
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yes cylinder has to be removed, still a reed cage and 4 pedals
If you look close at the picture you will see chips in the cage, black area.
On one cage I have an allen key holding up a broken reed pedal and can see chips under it. The pedal next to it is cracked also and will break.
If you look close at the pic with the assembled reeds they are dual stage reeds. Even if one breaks they will not damage your engine.
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