This if for a friend, his bike has off late been losing power as soon as it touches 180 kmph through 190 odd. In the past he has done speeds well in excess of 180 kmph without a hitch in the accerleration.
We really are clueless about this and I would appreciate any help for the same.

I had experienced a similar problem on my 135 cc 2stroker Yamaha, the bike would just suddenyl lose all its power at 70-80 kmph, and sometimes without fixing a thing it would just run like a champ.