09 xtx start issue

[Grant Nielson]

I think you are on the right track with the starter clutch.

Have you heard of these things failing ?

 

[4strokes]

In my opinion. the Chinese starters are a huge gamble with the difficulty of changing it in a nytro. also, I have rebuilt many starters and if the brushes were burned, it wont hold up, shorted... the scraping noise you here is the starter turning backwards, making the brushes dig. I would go right back to the starter, like it or not. get a good used one from a vector or something, pop it open and be sure magnets and brushes are good, repack the bearings etc. the Yamaha ones are like 300 or so. most any Chinese starter I have ever used fell apart before too long. I went through this with my nytro last year and chose to make one good starter out of 2, just could bring myself to get the china

 

[4strokes]

or the magnet came loose, that would scrape too

 

[grizztracks]

The one way clutch behind the fly wheel can fail and destroy a starter and gears. A stuck starter relay is often blamed for keeping the starter engaged with the engine but I believe it's not always the relay but instead a stuck one way clutch that causes the failure. You need to remove the fly wheel and inspect all the starter components.

Do not roll these engines backwards. Even slightly

Read This: https://ty4stroke.com/threads/starter-gears-and-one-way-clutch-inspection.150516/

 

[4strokes]

The one way clutch behind the fly wheel can fail and destroy a starter and gears. A stuck starter relay is often blamed for keeping the starter engaged with the engine but I believe it's not always the relay but instead a stuck one way clutch that causes the failure. You need to remove the fly wheel and inspect all the starter components.

Do not roll these engine backwards. Even slightly

Read This: https://ty4stroke.com/threads/starter-gears-and-one-way-clutch-inspection.150516/

Have you seen that clutch go yourself? Out of thousands of engines I have worked on over my life, I have seen 2 or 3 bad starter hilliard bearings and I am sure was from lack of oil or filings or watery oil etc. and even then, caused it to slip and not engage, no noise, no binding.. I find it to be far superior to a dry Bendix. Although I agree with you about rolling the engine backwards with risk of jumping timing, he said he did and described it as smooth engine turn forward and engaging starter rolled backwards, which tells me the one way starter clutch is working correctly. when I change a starter, I stick my finger in and roll the ring both ways to check for binding/smooth engagement and play etc... If there is a thread here with evidence of bad starter clutches, I would like to see it.

 

[grizztracks]

Have you seen that clutch go yourself?

Several............ I guess you didn't take the time to read through the link I provided. I've been inside these stator covers more than most and will say these starters and starter gear assemblies are weak. They've been problematic for years and not just in the Yamaha snowmobiles, I've seen problems on the ATV side also.

https://ty4stroke.com/threads/starter-gears-and-one-way-clutch-inspection.150516/

 

[74Nitro]

Several............ I guess you didn't take the time to read through the link I provided. I've been inside these stator covers more than most and will say these starters and starter gear assemblies are weak. They've been problematic for years and not just in the Yamaha snowmobiles, I've seen problems on the ATV side also.

https://ty4stroke.com/threads/starter-gears-and-one-way-clutch-inspection.150516/

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Absolutely. I've changed a few of these over the years also.
I wouldn't say the failure rate is high by any means, but they do occasionally fail.

 

[74Nitro]

As others have pointed out, if you remove the starter you should be able to stick your finger in and the gear will spin freely in one direction only.
When turning the engine backwards the noise you hear is spinning the starter motor, which is normal. It shouldn't spin when engine is rotated forward of course, because of the one-way starter clutch.
I know it's not recommended to turn the engine backwards, but I have never ever seen one skip time unless the timing chain is worn out, or has a bad/weak tensioner.
Nonetheless be careful or avoid.

 

[4strokes]

wow, I appreciate it. Learn every day I guess. most of my experience is bikes and wheelers. maybe continuous high rpm is hard on it? Is it possible it is the result of a stuck relay? Are we talking viper kick back sleds? Glad you brought this up, because I thought it was a bullet proof design. Japanese have used it in bikes since day one and have daily encounters with other designs. You got any idea of what caused that, I would like to know. Mine has 25k I and I fully intend to keep it rolling. no, I didn't read the link, but will for sure. thank you