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post #1 of 8 (permalink) Old 06-29-2010, 12:45 AM Thread Starter
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yamaha sx 700 overheating

my dad has a sx 700 triple when we ride it it will overheat shut it down let it cool ride it for a while then the same thing does this sled have a thermostat or what could be the problem
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post #2 of 8 (permalink) Old 06-29-2010, 07:14 AM
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no thermostat in that sled, although it appears as though there could be one. could be as simple as an airbubble in the cooling system or snow conditions, or as complex as the water pump failing if its a high mileage machine.
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post #3 of 8 (permalink) Old 06-29-2010, 11:28 AM Thread Starter
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it has 5500 miles on it
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post #4 of 8 (permalink) Old 06-29-2010, 12:23 PM
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make sure snow is getting kicked up on the heat exchangers when you ride, make sure there's actually coolant in the resevoir and then start looking to see if the water pump is working properly.

Mine - 1989 Yamaha Phazer 485 w/ Comet 102C and boyesen power reeds. 14,356 kms.

Dads - 1997 Yamaha V-max XT 600 stock w/ polaris P-85 clutch

Brothers - on its way home soon! either a yamaha or skidoo. not sure what yet.


First ride of the 2009/2010 season - 11/12/09
09/10 km's - over 1200. pretty good for only half a seasons worth of riding.
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post #5 of 8 (permalink) Old 06-30-2010, 07:02 AM
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as snowpro mentioned, eliminate the obvious first. also, as unbelievable as it may sound, something as simple as a bad cap loosing pressure. what i have found out on some of the higher mileage sleds, and yours is pushing the threashold, there is a brass gear on the crankshaft that drives the impellor shaft that will spin. it is pressed on between two bearings and since the brass heats faster than the crank, it will work properly for about 10-15 minutes until the metals even out in temp and the gear free spins on the crankshaft, basically not turning the impellor shaft, and the overheat occurs. careful here as the water pump shaft also spins the oil pump.
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post #6 of 8 (permalink) Old 01-13-2013, 06:20 PM
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79 yamaha 700sx overheating

If you can't see water flowing through the cap good chance you need a new pump impeller. The impeller has splines made of softer metal than the shaft, mine wore off near smooth . Lack of pump power to flush air is likely a sign of this.
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post #7 of 8 (permalink) Old 01-14-2013, 05:55 PM
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This is from 2010
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post #8 of 8 (permalink) Old 01-15-2013, 08:16 AM
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Different people search for answers every year
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