| Barry
The filters I use, which go by the poetic name of “Crap Trap”, are made of a clear plastic tube with 2 filter elements and aluminium ends. They have a couple advantages; you can see if they are getting blocked and they don’t have a sealing ring to leak. To clean them out just reverse flush them, which is the correct method for any filter, I’ve seen people attacking them with pins, not a very clever idea!
As for the breather extension pipe, it’s the internal volume that’s important.
As the piston moves down it pushes the crankcase waste products out of the breather, if the volume of the breather extension pipe is greater than the sweep volume of the piston (the engine capacity) as the piston moves up it will simply suck the “gunge” back into the crankcase. Provided the volume of the breather extension pipe is only a small proportion of the engine capacity the amount of waste sucked back into the crankcase doesn't cause any problems.
Grahame |