i have run into that problem once coming off the freeway using both brakes i started getting this horrible shudder through the handlebars; i release and braked again and it was gone, i read a thread on it a while back dont know if anyone has found a solution yet though so I started fiddling to recreate it when walaa. i can now do it (not as hard, but enough to cause a problem for an emergency brake) it will begin to shudder when i use front brake only and seems to start when the forks reach near the end of their travel in a normal brake dive. over and over and over again. this is after i was riding for bout 25 minutes worth of city miles. if i can recreate this consecutively then i think im going to have a visit with the yami dealer.