Man, you need to fix that! Try 30/30 or 32/32. If you do use different pressures try 28/30 or 30/32. The rear tire takes and gives more force than the front so you need more pressure in the rear so it won't over heat.
The rule of thumb is measure your tires stone cold (start at 30 psi), then ride a session so they fully warm up. Once you stop measure the pressure right away; the difference should be about 4 psi more, eg: 34. If it didn't get to raise much, lower your pressure (however you may not have ridden hard enough), if it was more than 4 psi add air. But 30 psi is a good place to begin.
Regardless, 26 is WAAAAY too low for a rear tire.
Next question, what kind of tires are you running? If they OEM get a new set of tires.
The handbook recommends 33 front, 36 rear. On my old Dunlop Qualifiers that was fine, but with my new Maxxis tyres they like to be a bit harder - about 35/38.
Lots of variables here with the biggest being your loaded weight/your brand of tires, but as Hellgate said, 26 psi is too low! I tried lots of different pressures but I went back to the dealer recommended 33/36. Safe riding!
+1 on looking for the recommended pressure of whatever tire you're running. The range from one tire to another can be 5-10psi depending on the brand/type/use.
FFIW I run my BT016 @ 36psi f/r on the streets (as high as possible for the grip I need, so that they last longer... if I start sliding around, I lower a couple of psi at a time and gauge in the next corner ).