Sd12/5506rpm

[Matt Moak]

2017 winder 240 hurricane tune . Bunch of other goodies and 10,500 ish miles . Been in the garage since November fired up fine when I changed oil back in November . Went to fire it up today and got sd12 and tach reading 5506 rpm. My research is telling me I have a bad stator/crank sensor. I will do the appropriate diagnostic I wasn’t able to do tonight . Just wondering what any of you guys have to say ? Thanks in advance

 

[journeyman]

I would make sure your battery is good first.
Common Causes & Solutions:

• Crankshaft Position Sensor (CPS): The most common culprit; it tells the computer when to spark.
  • Fix: Often requires replacing the entire stator assembly as the sensor isn't usually sold separately.
• Stator Coils: Failing coils can produce incorrect signals or voltages.
  • Fix: Test stator output (should produce AC voltage while cranking) and replace stator if readings are low.
• Voltage Regulator: A bad regulator can also cause the SD12 code.
  • Fix: Test the regulator or replace it if other components check out.
• Fuel Pump: In some cases, a lack of fuel due to a priming issue can manifest with this code.
  • Fix: Verify the fuel pump is priming correctly.

Troubleshooting Steps:

1. Check Battery & Fuses: Ensure a strong battery and good fuses.
2. Test Stator Output: Unplug the two-wire plug near the voltage regulator and check for 5-7V AC across the wires while cranking.
3. Inspect Wires: Look for damaged wires leading to the stator cover.
4. Check CPS Resistance: (For Arctic Cat models using same engine) Test CPS resistance (around 336-504 ohms).
5. Listen for Fuel Pump: Make sure the fuel pump primes when the key is turned.

Key Takeaway: Don't ride if you have this code; it indicates a critical system failure that will leave you stranded. Replacing the stator/sensor assembly is a very common solution for this specific SD12 code on Sidewinders.

 

[Matt Moak]

I would make sure your battery is good first.
Common Causes & Solutions:

• Crankshaft Position Sensor (CPS):The most common culprit; it tells the computer when to spark.
  • Fix: Often requires replacing the entire stator assembly as the sensor isn't usually sold separately.
• Stator Coils:Failing coils can produce incorrect signals or voltages.
  • Fix: Test stator output (should produce AC voltage while cranking) and replace stator if readings are low.
• Voltage Regulator:A bad regulator can also cause the SD12 code.
  • Fix: Test the regulator or replace it if other components check out.
• Fuel Pump:In some cases, a lack of fuel due to a priming issue can manifest with this code.
  • Fix: Verify the fuel pump is priming correctly.

Troubleshooting Steps:

1. Check Battery & Fuses: Ensure a strong battery and good fuses.
2. Test Stator Output: Unplug the two-wire plug near the voltage regulator and check for 5-7V AC across the wires while cranking.
3. Inspect Wires: Look for damaged wires leading to the stator cover.
4. Check CPS Resistance: (For Arctic Cat models using same engine) Test CPS resistance (around 336-504 ohms).
5. Listen for Fuel Pump: Make sure the fuel pump primes when the key is turned.

Key Takeaway: Don't ride if you have this code; it indicates a critical system failure that will leave you stranded. Replacing the stator/sensor assembly is a very common solution for this specific SD12 code on Sidewinders.

Battery is brand new but I will still check it out. Appreciate the reply will be tearing into it shortly . Will update with culprit/fix

 

[Matt Moak]

Update it was the crank position sensor . Yamaha was back ordered till the end of the month and arctic cat was back ordered till may. Shout out to rmstator in Quebec I had a new stator with the crank sensor within a day . 30 day money back and a 2 year warranty. Likely about a 4 hour job worst part is the 1 turbo bolt on the backside of bracket that goes across subframe and scraping the ole gasket off.

 

[sideshowBob]

Update it was the crank position sensor . Yamaha was back ordered till the end of the month and arctic cat was back ordered till may. Shout out to rmstator in Quebec I had a new stator with the crank sensor within a day . 30 day money back and a 2 year warranty. Likely about a 4 hour job worst part is the 1 turbo bolt on the backside of bracket that goes across subframe and scraping the ole gasket off.

Did you complete the new stator install yet? No starting issues now?

 

[Matt Moak]

Did you complete the new stator install yet? No starting issues now?

Yes starts and runs fine now. But was a little discouraged after install i turned key on engine off and the cluster was still showing the same code and engine rpm till I started it and all good now.

 

[sideshowBob]

I have a spare RM stator in my " parts heaven" for the eventuality that my 2019s stator needs replacement. Good to know the RM stator works good.

 

[Matt Moak]

That’s not a bad idea. I normally try to run oem parts for most things but that just wasn’t an option this time around.