If the bounce is at speeds over 100kph in a straight line and you notice your instrument cluster moving up and down, it will be a tyre/wheel balance issue. It is easy fix it yourself for less than $5 or pay for a motorcycle repairer to do.
If you want to do it yourself, visit your local car tyre sales outlet and ask to purchase some self-adhesive (stick-on) lead balance strips. Approx $1 each. They are approx 1cm x 10cm with snap-off grooves making half a dozen little squares. Most car tyre outlets will happily sell you these weights if you explain why you need them because they generally don't do bike tyres.
1. Remove your front axel/wheel from your bike and re-insert your axel into the wheel hub.
2. Make 2 piles of something so that you can sit the axel on (I use 2 piles of old house bricks).
3. Slowly spin the wheel and wait until it comes to a stop.
4. Using a felt marker pen place a mark on the exact highest point on the wheel rim. This mark is the exact opposite of the heavy point. Repeat 2 or 3 times to get the exact light point.
5. Chop up one of your lead weight strips into single squares and using a very small blob of Blutack, stick 1 lead square on your wheel at the marked lightest point.
6. Repeat 3, 4, 5, until your wheel will stop at any random point. You may need peices smaller than 1 little square to get it perfect. It is now balanced.
7. Count up exactly how much weight you used and chop one strip to this exact amount.
8. After thorough cleaning of your rim with methylated spirits (at the stick-on point) to remove any and all traces of oil and dirt, cut that exact amount in half and place half on each side of the wheel (left/right) at the light point you have just cleaned. You may need to pre-bend the lead weights to match the profile of your rim.
9. Refit your wheel/axel to your bike. Test.
10 At half tyre wear re-balance your tyres.