Chaincase removal and inspection

[yamadoo]

View attachment 100485
Definitely not enough time so......
This is the pan I used and needed every inch.

I for one, who I think represents many, Love your input and "How too's"

THANKS

 

[Yamadog]

Thanks alot Cannon I just put mine all back together last night now you got me thinking

 

[cannondale27]

I got the new gear will measure it. The case has a gasket. Reusable

 

[TD Max]

Any reason why they wouldn't use a needle bearing versus a bushing?

What sort of oil is in the chaincase? Is it a motor oil base or gear oil base?

 

[sxr70001]

Don't split the oil tank. Only remove chain case with oil tank attached. The chain case has a reusable o ring.

 

[cannondale27]

The wear is easily measurable. Is it enough to cause a failure? I don't know that and there is no evidence such as nicked teeth. It never ground the gears. I did have a reverse servo failure which was covered under warranty. Yamaha will get the old gear and we will see what they say as far as covering it. I am not chancing it. New gear is going in.

Thanks for the compliments guys but all of you have helped me many times so not necessary. That's what makes this site great. We are a team. Friends.

 

[TD Max]

OK so this is the upper main gear correct? And there is counter rotation in this bushing only when in reverse?

Trying to get a handle on what is wearing the bushing. Lack of lube seems to be one likely issue. Is it lack of distribution, retention, or both?

I have a 22T upper that I plan to install at first service. I also have some bearings that will be going out for coating application and could easily send this gear to be coated.

 

[stingray719]

Curious, was this gear set originally run by early Yamaha specs of finger tight and 1/2 turn out?

 

[sxr70001]

It almost looks like you could press that bushing out and put in a new one if you didn't want to replace the entire gear every time.

 

[stingray719]

It almost looks like you could press that bushing out and put in a new one if you didn't want to replace the entire gear every time.

That was my thought.

 

[drumz11]

It almost looks like you could press that bushing out and put in a new one if you didn't want to replace the entire gear every time.

You can with some if the aftermarket gears. I don't know about the stockers.

 

[TD Max]

I'm still a bit puzzled why the bearing is wearing out when it only spins while in Reverse?

Looks like it could use some sort of a lube channel to let some lube get in. That or a needle bearing.

An oil with some "climb" to it might help.

 

[cannondale27]

TD this gear spins all the time but only has power transferred through it in forward. It's the main top gear. I bet a DLC coating would work real well here.

 

[TD Max]

In normal operation (forward) doesn't it turn same speed and direction as the shaft that it rides on? Then in reverse the shaft spins and the gear disengages?

Or am I understanding this wrong?

I was thinking more of a moly dry film lube. I think DLC is something more for a solid steel piece like a wrist pin, but I may be wrong.

 

[NOS-PRO]

Took mine apart last night and the to gear is loose, but only a little more than the new 22 tooth I bought awhile ago.

Old gear measures 1.0057 and my new 22 tooth gear I never used yet measures 1.0031

Amsoil synthetic gearcase oil and 1/2 turn out from tight while warm. No reverse issues