SOLVED. YA Fantasy novel from 1990's about two kids with magic acorns being chased by wolves and witches with a magic map. [s]

[Heather]

I think kids went in well to get to another world. The witches in one scene make it snow using map and kids get coats from magic acorn. I think there was motorcycles that witch rode (maybe). Pretty sure author was from last half alphabet(n-z). There was a boy and girl; main characters.

[Rainbowheart]

The Well of the Wind?

[Heather]

Thanks but that's not it.

[Becca]

I think this is The Hounds of the Mórrígan by Pat O'Shea - they have magic hazelnuts, not acorns. I checked the Google Books preview (https://www.google.co.uk/books/editio...), and here's the scene where they get coats from one of the nuts:

He fumbled in his pocket and with stiff fingers he probed inside the leather bag for a hazel nut.
When he managed at last to bring out a nut, it lay jumping slightly on his trembling hand. He thought it would never open, although really it opened almost at once. He had to hold out his arms to take the treasure the nut had contained as they grew in size. And in his arms he held two hooded coats of some kind of white skin, with boots and gloves to match. The bigger coat was lined with some kind of red fur and the smaller one was lined with blue.

Witches on motorcycles can be seen on the cover of this edition:

[Heather]

Thank you. I think this is it!