Get the front wheel off the ground, on the centre stand with someone sat on the back or a block of wood/jack under the sump. the front wheel should spin freely, I'd say it won't be the brakes as you'd smell the pads burning and the discs and calipers would be red hot at 86mph!!!
Next test the wheel bearings, full lock one side and someone to hold the bars, hold wheel front and rear if it even has a hint of a wobble replace the bearings.
I think your looking at a fuel restriction or an exhaust problem, black smoke or excessive noise? Look for 4 rubber washers behind the carb rubbers, if there remove and refit.
Next test the wheel bearings, full lock one side and someone to hold the bars, hold wheel front and rear if it even has a hint of a wobble replace the bearings.
I think your looking at a fuel restriction or an exhaust problem, black smoke or excessive noise? Look for 4 rubber washers behind the carb rubbers, if there remove and refit.
Treat everything in life the way a dog would- if you can't eat it or foc it, forget it.