Hi guys i recently bought a 2010 klr with 31 000 km in it. It's got almost new kenda trackmaster (knobbies) and i noticed that when i go at highway speeds 90km and up it shakes, it's sometimes scary, specially when i hit cracks in the pavement. I checked the air in the tires and check the bolts on the fork and it still doing it. Could it be the tires? I ordered a superbrace (waiting for it) what else should i check ?
Yes, it could be the tires.
(I'll highly recommend 34-30 PSI in the front tire and 32-28 PSI in the rear, as a starting point.)
Do you see any balance weights? If not you might ought to inquire about re-balancing them.
Check for proper/even seating of the tire beads on the rims and rim/spoke trueness as already mentioned.
How loose fitting is Your Jacket? Sometimes it is the flapping of OUR clothing that induces wobble!
Try riding with only your throttle hand.
If you use your front brake quickly/firmly, can you feel or hear any 'click' from the front end? If so, the steering bearings may need to be adjusted a bit.
Does the bike have big / square panniers or top box on it? Is so, try removing them.
The list can get quite long.