No start so time to start diagnosis

13699 Views 29 Replies 7 Participants Last post by Gibbster, 10 mo ago

Gibbster

Discussion Starter · 12 mo ago

Well i have too long put off and time to tear into my 2016 motor to figure out what went wrong. Story is after returning from a 100 mile or so ride it smelled a little hot but not overheating at all. After shutting down and attempting to restart it cranks and no start and if i try a few times it pops or somewhat backfires lightly. Now i finally got our shop put up and now have room to work so starting out with first (front cylinder) spark plug electrode white and other two plugs look about normal. Looking like time to prep and pull motor, pull head and oil pan and see what failed and bring it back to life!

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pilotzenith

· #2 · 12 mo ago

Do you think its white from being lean, or white from not firing? Is it wet, smells like gas?

Gibbster

Discussion Starter · #3 · 12 mo ago

I am not getting spark so now tracing down and to check crank sensor and wiring with multimeter, so for that i have a friend coming to help and see what is really going on. My wife and i just cannot part with the yxz so it has to get fixed. To much work into this machine already.

Gibbster

Discussion Starter · #4 · 12 mo ago

Compression test next also today.

Gibbster

Discussion Starter · #5 · 12 mo ago

After diagnosing and finding no spark tests leading to crank sensor failure with ohms test at a little over 200 and specs call for 445-544. Tore down and removed rear cover and ordered parts and more for some additional maintenance while apart. Fingers crossed this will bring it back to life and both me and wife are ready to drive the yxz again.

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fortrdb

· #6 · 12 mo ago

I bet that fixes it. Must be an internal short inside the pick-up coil causing the low resistance. I have had to replace two crankshaft sensors now and both of those failed wide open. So you have found a more subtle failure mode of the crankshaft sensor. I do not believe the ECU can detect that condition..... so no code 12 was showing, right?

Reactions: 1

Gibbster

Discussion Starter · #7 · 12 mo ago

fortrdb said:
I bet that fixes it. Must be an internal short inside the pick-up coil causing the low resistance. I have had to replace two crankshaft sensors now and both of those failed wide open. So you have found a more subtle failure mode of the crankshaft sensor. I do not believe the ECU can detect that condition..... so no code 12 was showing, right?

Correct, i had no code.

Gibbster

Discussion Starter · #8 · 12 mo ago

fortrdb said:
I bet that fixes it. Must be an internal short inside the pick-up coil causing the low resistance. I have had to replace two crankshaft sensors now and both of those failed wide open. So you have found a more subtle failure mode of the crankshaft sensor. I do not believe the ECU can detect that condition..... so no code 12 was showing, right?

Well my stator has some damage and so does rotor. Also found one tooth chipped in starter idler gear. Have not found any other damage yet or chip but looks like it was like that for a bit. Now having to save for new rotor and need to figure what tool i can use for rotor removal other than factory flywheel/rotor removal tool for around $400! Next search is on and it sits longer.

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Gibbster

Discussion Starter · #9 · 12 mo ago

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Gibbster

Discussion Starter · #10 · 12 mo ago

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Gibbster

Discussion Starter · #11 · 12 mo ago

Looks like it has been this way for a long time and finally wore so bad and then crank sensor failed. Wish something would have shown up earlier where i had extended warranty. And that idler gear would have been on Yamaha for defect!

fortrdb

· #12 · 12 mo ago

Well that is certainly a bummer.... did the crank sensor show any signs of damage from debris impact? At least you found it.

YumaYXZ

· #13 · 12 mo ago

Good on you for getting in there and figuring it out. Sucks it happened but now you can move forward......

Reactions: 1

Gibbster

Discussion Starter · #14 · 12 mo ago (Edited)

fortrdb said:
Well that is certainly a bummer.... did the crank sensor show any signs of damage from debris impact? At least you found it.

Starter idler gear tooth broke off some time ago and looks to be ground up and imbedded in rotor surface and stator. All parts including yamaha patended overpriced rotor puller ordered.

Reactions: 1

fortrdb

· #15 · 12 mo ago

Are you replacing the starter one way clutch while you are in there? Given the problem you found, I think I would be replacing that too while I was in there. Curious about this rotor removal tool. Do you have PN and pricing?

Gibbster

Discussion Starter · #16 · 12 mo ago

fortrdb said:
Are you replacing the starter one way clutch while you are in there? Given the problem you found, I think I would be replacing that too while I was in there. Curious about this rotor removal tool. Do you have PN and pricing?

90890-01362-00 part number for rotor puller $341 best i could find except some untrusted out of country company with no one to talk to. And yes i ordered starter one way clutch also. Found my best prices with free shipping at Chaparral expect for the tool which is coming from Partzilla.

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Gibbster

Discussion Starter · #17 · 12 mo ago

Gibbster said:
90890-01362-00 part number for rotor puller $341 best i could find except some untrusted out of country company with no one to talk to. And yes i ordered starter one way clutch also. Found my best prices with free shipping at Chaparral expect for the tool which is coming from Partzilla.

The yxz must live again! I must shift again! Have a KRX for crawling in mountain trails here, fun enough but there is nothing like the yxz.

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Gibbster

Discussion Starter · #18 · 11 mo ago

Well looks like i am stuck indefinetly at this time for a backordered rotor puller with no eta available. Being told be everyone i call none available. This is crazy for a tool not to mention the rediculous price. Looks like yxz sits for another year.

fortrdb

· #19 · 11 mo ago

Will a harmonic damper puller work? Looks like that is about all the fancy Yamaha puller is to me. Might be worth a try.

Gibbster

Discussion Starter · #20 · 11 mo ago

fortrdb said:
Will a harmonic damper puller work? Looks like that is about all the fancy Yamaha puller is to me. Might be worth a try.

I know, trying to find something that fits.

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