I have a 99 zr 600 EFI and it seems to bog out after about 10 min of riding, it only bogs at around 7000 rpm if you hold it at a steady speed/rpm. I run premium fuel (no ethanol), synthetic oil and Dexcool antifreeze (the orange stuff). I just had the engine completely rebuilt about 350 miles ago ($1,800) it has good compression the sled has a total of 7234 miles on it. I am wondering if its has anything to do with the thermostat because the temp light comes on only after I shut it off then start it again. The light goes off within 20 seconds. If I unplug the witre on the head that goes to the thermostat (I believe) the light wont go on. I am so frusterated with these money pits my brother just came home on his skidoo with a broken steering colum and my friends polaris needs the tunnel re rivited. Skidoo, arcticat, polaris, whatever to me all these machines are junk unless you have alot of money. Once I fix mine Im sellin it and gettin outta the sport. Any suggestions on WTF is goin on would be awesome and once Its fixed Ill either trade for a truck or sell it thanks. oh yeah and its not the TPS its already unplugged.