Originally Posted By: Silk
Any solvent and any oil will do...but a non filter oil will be prone to dripping out the bottom. Any seam in the filter is the failure point, but they also just fall apart with age. Instructions for my Piaggio scooter are to wash in premix...which is a bit strange as it has an oil pump and doesn't run on premix, and at 50:1 there won't be much oil in the filter.
Thats pretty thin premix. If that's their specific recommendation I suppose it might be to avoid over-oiling, since most of the petrol will evaporate. Do they have you squeeze it, blot it or just drip/air dry?