ok its doing it again
what i originally thought was water in the tank causing the bike to back off under load has come back to bite me in the ass again.
theres no way it can be water in tank now cos ive drained the tank let it dry out and kept it in the garage all the time
this may sound strange but it only does it in 4th 5th when there is a strong head wind, but it cant be the wind causing the bike to slow as the revs are to high. i think its gonna be fuel starvation or coils packing up