they are a great bike bill
a close copy to the works bikes
very nice handling
rear suspension excellent forks quite good once set up
standard motor down on power slightly to the others
but can be fixed easy ,like zorroz said change the head
or have it reshaped ,bit of a port clean up and a pipe
and it will go as good as anything out there
or you could leave it standard they still go quite well
i raced one in 84 as well, not as fast as my 82
but a much better bike to ride