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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.

I was told not to run dexcool. Why not?
And whats the easiest way to drain the coolant? (done it b4 but made a real mess) thanks
 

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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.

I was told not to run dexcool. Why not?
And whats the easiest way to drain the coolant? (done it b4 but made a real mess) thanks[/b]
Easiest way to drain the coolant (without making a mess) is to stick a piece of fuel line on the drain fitting, then feed it out through the bellypan (loosen a few screws on the pan. Some people think the Dexcool is junk, but I've never had problems with it. Never used it in a sled, but I can't see why it would matter.

When you say TPS, are you talking about the throttle safety switch on the bars? That's not the same thing as the TPS, which is mounted on your throttle body, and gives throttle position to ECM. If you messed with your TPS position, that would definitely screw things up.

It sounds like you might be running a bit hot. Are you sure that you got all the air out of the system when you did engine work? Try starting it cold with the front end elevated about 2 feet, then let it run with the cap off until all the air bleeds out. If there is no air trapped, then check T-stat with hot water and thermometer (do not allow it to open all the way, or it will be scrap), or replace. If T-stat is good, then check resistance on both temp sensors to see if they are working properly.

And yeah, nobody ever said this was a cheap sport, especially if you are running older iron....
 
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