I think maybe its just that you are braking the front wheel in a turn, which is loading up the force on the handlebars.
On a motorcycle you never want to brake in a turn, esp not hard. In the MSF riding class they really drilled it into our heads, if you have to stop in a corner straighten the bike up first and then 'panic brake' with the front and back wheels.
It sounds like you are braking first and then trying to straighten up the bike with the brake held on hard. Thats going to cause a couple of serious problems if you do that at speed:
1. if you brake (front or back wheel or both) in a curve the bike will spiral in / fall into the turn harder, because the balance of the lean of the bike and the centripetal force trying to stand the bike up is suddenly altered. The bike is now falling into the turn harder which makes it even more difficult to straighten it.
2. you only have so much traction on the front wheel to work with. When the bike is turning you are using a lot of your traction. If you then try to brake hard the front wheel can break loose and you will go down.
I would put the front wheel up in the air with blocks on the frame and make sure there is nothing wrong with the steering bearings - no slop and no binding. If that is all good then read up a bit on braking in turns. There are some techniques that racers use to load up the front tire, but man that can put you right on the edge of dropping the bike in the worse possible place - in a fast turn. Its one thing on a race track, its a bad deal with on-coming traffic, or a curb.
Just to be clear, if you are in a right turn, you are pushing the right hand grip forward to countersteer the bike to lean to the right. If you suddenly need to stop push the left grip to lean(straighten) the bike back up vertical and then stop for all you got without locking up the front wheel.
You can lock up the back wheel in a panic stop as long as you hold the skid till the bike stops completely. If you let off the back brake while the bike is skidding and still moving you will high side, it will throw you through the air like a wild horse.
If the front brake starts to lock up, get OFF the brake instantly. The spinning front wheel is the only thing keeping your bike from falling over, just as if you stopped the bike and let it go with the kick stand up.
One of the most critical skills for riding is judging a curve before you enter it, slowing the bike down before entering the curve, and then if you have margin to go faster roll on the throttle smoothly. Getting into a turn too hot and then trying to brake.... its too late at that point, for all the reasons listed above, you are going wide or you are going down.
I understand that you are an experienced rider and I apologize if this post sound a bit preachy. I have panic stopped in a turn like I described, going around a blind curve there was a high loader putting tree limbs into a dump truck right in the middle of my lane. No flag man, no warning signs. Getting the bike straight and then stopping really works.
And I have also nearly spiraled into a curb. I pushed the choke in too soon on a cold morning. Making a right hand turn at a corner the engine stumbled and the bike nearly went into the curb on the right.
Keeping your speed steady in a curve is not optional.
Last edited by KCW; 10-11-2016 at 08:30 PM.