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SD12. Dead

THE BAD parts without crank sensor. You can see the wires are cut.
 

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The plug for this gets plugged into front of machine into the voltage regulator. And then the smaller white plugs go together. This small white plug is the one you would use for testing the crank sensor also. Is up front under the fuse block and just to the left if you standing in front of machine.
 
jonlafon1 said:
I’m up and running! Thank you Clutchmaster for your help, a nice warm garage and of coarse ALL TOOLS a guy could need. This is a pretty time consuming job. Took us 6-7 hours BUT we also cracked the chaincase for fun as Clutchmaster was dying to check my upper gear bushing! He was like a kid on Christmas morning just dying to tear open a present. So the exhaust has to come off. Oil has to be drained as you need the oil lines disconnected. Oil needs to be drained out of lower access panel also. This helps to prevent oil from contaminating your gasket. The cross brace needs to be removed which is in front of magneto case cover. 3 bolts the go from the turbo to this cross member were removed. 2 needed heat and one is behind the cross brace and kind of a hard one. It’s possible with a knuckle socket and some swearing or wait I mean some patients which I have less then Clutchmaster! No it’s true really! With the cross member removed the turbo Did remain on. Which I believe is a better option but hey their is more then one way to skin a Yamacat! Once you can get at the magneto cover then it’s removing bolts. 2 are black and have arrows on the cover as to where they get reinstalled. Theses 2 black bolts also need silicone and or the Grey Yamaha bond which is what we used. Once your ready to remove cover be prepared for the magnets to “play with you” some. We may have used different words. But you have to fight the magnets some when removing And installing the cover back on. ALSO two cylinder like posts/pegs that are on the seal area make sure to watch for these. With cover removed then it’s time to clean old gasket off. Fun! Removing the old parts from within the magneto case can be fun as they are VERY tight and have thread locker. The 2 bolts for the crank sensor had to be heated to be removed. We melted the sensor some but it was junk anyway. Installed new parts and used blue locker. IMPORTANT make sure the starter gear is in proper orientation when reinstalling cover as the pin which the gear is on sits in the cover. New gasket should also be purchased for install. Getting the cover back on onto pegs and starter gear pin can be a challenge. I tried a couple times and Clutchmaster finished the job. PATIENCES REQUIRED on the install for cover. Watch your fingers as the magnets want to pull the cover on very fast when you get close. The wire plug that comes out of case needs some silicon/Yamaha bond also when reinstalling.
O and the top gear bushing was about damn near perfect after 2500 miles. I think Clutchmaster was impressed and that’s not easy to do! He might just be switching chaincase lube. Any questions for someone down the road doing this install can surely reach out to Clutchmaster and or myself.
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Congratulations! All I can do is shake my head in frustration as I read your repair story. Another marvelous design on the Yamacat. Parts like crank sensor should be aerospace quality so they don't fail! Charge me $20 more for the sled if you have to! It's just too critical of a part, in a really difficult to get at place, for it to fail! Glad you got it going. Merry Christmas.
 
Now this was in the package with the new stator/crank sensor. I believe is says something about a OCD guy from Maine and belts, socks, and guns??
 

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Turboflash said:
Congratulations! All I can do is shake my head in frustration as I read your repair story. Another marvelous design on the Yamacat. Parts like crank sensor should be aerospace quality so they don't fail! Charge me $20 more for the sled if you have to! It's just too critical of a part, in a really difficult to get at place, for it to fail! Glad you got it going. Merry Christmas.
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I agree. Plenty failed on early year Apex's also.
 
Sounds like you better hurry and send Pat's and clutchmaster an extra special Christmas card...lol
Kudos to both!
 
cannondale27 said:
I should have pointed you to this thread ahead of time. Bet you guys had fun anyway. I agree coming from Yamaha would think this issue would have been solved already. Been happening since first FI sleds. Maybe before. I will say if paranoid could run the Viper/Nytro and Winder at same time. one fails just plug other in. Thats how mine is set up for now.
https://ty4stroke.com/threads/sidewinder-stator-pickup-coil-flywheel-and-cover-on-viper.154623/
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No problem you still provided plenty of help. Merry Christmas bud
 
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