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Old 01-30-2012, 09:17 AM   #1 (permalink)
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Default help 01 yamaha SX Viper over heating

Trying to help a friend out. Have a 01 Yamaha SX Viper. This sled will sit and idol for around 5 minutes then the over heat light comes on. Ive heard that this is a common problem any idea what could be wrong with this sled? new to Yamaha any info would be great.
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Old 01-30-2012, 09:42 AM   #2 (permalink)
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Just got it running today started then there was a red light flashing on the dash. and the gauge was cutting in and out. tried to give it throttle just bogged out then back fired extremely loud and died. got it started again did the same thing.
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Old 02-02-2012, 07:46 AM   #3 (permalink)
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Need more info...

It isn't an '01 Viper, they didn't come out until '02.

The gauge cutting in and out could have simply been from a very low rpm because of the poor idle issue...the gauge will reset constantly when the idle is really low.

I assume the sled has sat for quite a while, like at least since last season?
If so, then carbs need to be gone through. Poor/no idle is a common sign of dirty carbs. Gas evaporates in the bowls while sitting over the summer, then we go to start them and all the crud that was sitting in the bottom of the bowls from the evaporated gas gets picked up by the new gas we prime into the bowls when pulling it over. Visualize a bunch of chunks swirling around in the gas. It then gets sucked into the jets and plugs them, especially the tiny pilot jets.

Never heard of a common problem on any sled where it builds enough heat after idling for 5 minutes to kick on the temp light. I don't think they would even if there wasn't any coolant in the sled. Viper warning indicator has a round, red light with a hazard triangle in the middle of it. When it comes on, there could be several reasons why. Below the light there are four different emblems, one of them will come on to indicate what the warning light is on for. If I remember right there is a fuel emblem, and engine, temperature, and oil. Check to see which one it is, most common is low fuel. Don't feel bad, many of us have thought is was temp or some other serious problem, only to realize it was simply low on fuel.

So: Clean the carbs, and verify what the warning light is on for.
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Old 02-02-2012, 09:28 AM   #4 (permalink)
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This will bog out on the trails and not run right. no throttle response. and that red light pops on.
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Old 02-03-2012, 07:42 AM   #5 (permalink)
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Which still points at the carbs needing cleaned. Has that been done?

If this sled hasn't had much maintenance, the warning light could also be because of a pull-through on the power valves.
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Old 02-03-2012, 08:49 AM   #6 (permalink)
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cooling system needs to be bled and check throttle cable tightness it might be the TORS cutting in.
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Old 02-06-2012, 11:58 AM   #7 (permalink)
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just cleaned the carbs the pilots were clogged. started it back up the gauge would not read the idol was good was not to low or to high. the gauge would just flash the red light symbol. The tach itself just sat on zero, does the red light indicate something diffrent?
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Old 02-08-2012, 07:22 AM   #8 (permalink)
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any ideas?
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Old 02-08-2012, 08:21 AM   #9 (permalink)
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wires wore through under the motor? not sure if they fixed this for the vipers but the older sx's had this problem. are the heat exchangers warm or hot?
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Old 02-11-2012, 01:08 PM   #10 (permalink)
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Test out the stator, pull wiring harness from under the motor, very common rub through. I bet you its one or the other
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