With a single cylinder race engine, it is critical that both valves seal percent. Any leakage, and overall performance will suffer. Neway products are an excellent solution to accomplish high performance valve seal in small engines. Most of our original testing came from the production 5hp Raptor style Briggs and Stratton engine. The production engine block created a big challenge for getting the valves to seal, due to inconsistencies of mass production parts.
DIY valve seat grinding| Grassroots Motorsports forum |
Of course you know that valve seat recession is the process where the valve actual pounds the valve seat into the head. On old iron heads it was excessive seat wear caused by the use of the wrong fuel. Lead vs no leaded fuel. This of course proved to be a big myth with a dash of truth in it like most myths. The big myth part was that lead was needed in order to lube the valve and seat.
This should let the valve spring retainer and lock to loosen. Usually, one can pop these out with a screwdriver while compressing the valve spring. To make things easier you can use a common C-Clamp type valve spring compressor to compress the spring upward.
I don't think I have ever resurfaced a valve seat in place with a specialty tool. Just curious if anybody else had. In my early days in this trade most faucets had non-removable seats. A proper repair meant reseating with a tool designed for the job.
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