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post #1 of Old 12-23-2006 Thread Starter
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Yanmar 4JH air filter

First question:
I'm wondering if anyone with a 4JH has an air filter on their engine intake?
Some of the other Yanmars have filters but mine does not. Both the engine and service manuals indicate the location of the silencer where a filter would normally be. From these, it would appear that Yanmar didn't intend for a filter which doesn't make sense - I wouldn't expect lots of dust in the engine intake but it is possible for debris, belt dust, bugs, etc to enter.
Second question:
If I were to install a high capacity filter, would there be any long-term affect of restricting air flow to the engine.
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