The engine breather filter is a pain to fit. You may have to loosen the old air filter box so that you can jiggle it in.
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Little trick with this... take the clamp off the filter, hang it over the crankcase breather pipe loose.
Then the filter is flexible enough to be wiggled in there easy-peasy. Feed it over the pipe and into the clamp.
Worked out after skinning knuckles and shouting a lot first.