[Nocams]

I?ve used them before, they work well for the money.
At 240 hrs I opted to re-brush my own starter on the GP with crf450x brushes filed down to the correct dimensions and soldered on to the existing braid.
I?ve done this to multiple katos and a few gassers in the past.
Make sure to run a mark from end to end including the center barrel and reinstall with the marks lining up with one another so that the starters timing is in the factories optimum position.
$18 fix!
Get on it.