HPDI Mystery Filters.
Yamaha mystery filters
Yamaha HPDI mystery filters
The so called mystery filters are there for a reason and a very good one at that. Removing these filters will shorten the lifespan of the Yamaha High Pressure Direct Injection Pump (HPDI) dramatically and in some instances end it completely.
The older style HPDI pumps were fitted with three of these HPDI mystery filters. Two in the actual pump body and one in the pressure regulator. The new style HPDI pumps are fitted with two “mystery filters” per pump. IE two for a single pump and four for a double pump. Both located in the pump body.
We receive calls on a regular basis asking about the Yamaha HPDI mystery filters and if as mentioned on forums, it is a good idea to remove the filters completely. The answer is simple, replace them with new ones but DO NOT REMOVE THE FILTERS….EVER!
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