how to lower emissions?

The answer depends on which parts of the emissions are high.
Please post the full results of the test.
Was the engine fully up to temperature at the time of testing?

digger.
September 2009

I've over heard mechanics talking in the past that removing the air filter can lower the emison level as it sucks in more air better when engine hot for lower readings.
Can't guarantee as engine may be in bad state if not regularily serviced.

bob
September 2009