Get proper medical insurance
The E111 (now EHIC) only provides a bare minimum of cover on a reciprocal basis plus you may need to foot (at least some of) the bill, of which some may be reclaimable and some isn't. In some countries it is assumed that your family (which you won't have in that country) will support you in hospital for at least some things that you might consider essentials.
EHIC is not intended to be a replacement for medical insurance.
Decent medical/travel insurance isn't actually that expensive, especially if you get an annual policy. Just make sure it covers riding a bike of the size that you're using. Some have a nasty habit of saying that riding is covered in the headline summary of cover and then limiting cover in the small print to riding a 'small' (e.g. <125cc) bike.