Join Date: Dec 2009
Location: Olds, AB Canada
I would teach him the one rein stop, tell him you mean business. When you say slow down, he should slow down as soon as you say so. You could also try sponging the reins.
Or what I do is a light see saw of the bit, but there is a trick to it. You don't just pull on either side of his mouth. It's a give and take, so you are sliding the bit around in his mouth using only light contact with his mouth. I haven't tried this with a kimberwick so if you do try it, try it in a snaffle first.
Horses are scared of two things... Things that move and things that don't.