Power valve mystery

Mikeyx

New member
Talking about EC300, 2009.

When I got the bike, the PV left hand vent (?) hose had been plugged and the right hose was breathing directly into the atmosphere.

Later I installed a 10 mm spacer between the engine and LH cover, which clearly improved low end torque.

Now I unplugged and re-plugged the LH hose, and found that plugging has a significant effect on low end grunt!

Having dismantled the PV parts a couple of times, I really cannot figure out why plugging the hose or having the spacer should have any effect on PV operation.

Does anyone have informed opinions?
 
The left power valve hose is a drain.
It is ziptied closed for the EU requirements.

The hose fitting on the left has a calibrated orifice.
The fitting is interchangeable with the right side transmission vent.

I'm thinking the fittings may be swapped.
Over venting the left power valve chamber.
 
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