RM350 HP valve spring change

March 2025

Please see maintenance information here for more information about the valve

There has been a design change in the spring (our part no 4107) and main poppet (our part no 4105). The old designs are no longer available. This means that the poppet and spring should be replaced together.

There has been a change to the design of the spring, which now has an additional cap, and to the poppet, which now has a larger internal diameter to accomodate the new spring.

Note that all service kits supplied (our part no 4112) now include both the new poppet and new spring.