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-   -   1983 YZ490 Gear Box Pleaseeee Helpppp Meeee. (http://www.advrider.com/forums/showthread.php?t=855617)

athomerecords25 01-14-2013 04:48 PM

1983 YZ490 Gear Box Pleaseeee Helpppp Meeee.
 
What would cause my gears to not line up like this?

http://http://p.vitalmx.com/photos/u...jpg?1358207210

http://p.vitalmx.com/photos/users/25...jpg?1358207210

Shocktower 01-15-2013 01:19 AM

Where are the shift forks, it just looks neutral to me :ear

stainlesscycle 01-15-2013 08:58 AM

put the shift forks/shift selector drum in there and then take a look. it's gotta all be there to hold the gears up...no shift forks, and they gears will foul.

athomerecords25 01-15-2013 10:14 AM

Quote:

Originally Posted by Shocktower (Post 20487336)
Where are the shift forks, it just looks neutral to me :ear

That was just a picture of the top, the shift forks are there.

Here is a pic from the bottom. I know it is dark.

From the bottom:
http://p.vitalmx.com/photos/users/25...jpg?1358269763

athomerecords25 01-15-2013 10:15 AM

Quote:

Originally Posted by stainlesscycle (Post 20489329)
put the shift forks/shift selector drum in there and then take a look. it's gotta all be there to hold the gears up...no shift forks, and they gears will foul.

Everything is in there, Selector Drum, Shift Forks, Gears, Everything.

stainlesscycle 01-15-2013 10:45 AM

those pics are really dark, hard to tell what's going on. . can you put the shift drum in neutral, and take a look and see what's not mating properly? is the main and lay shaft all the way in - with any shims that may be against the bearings

athomerecords25 01-15-2013 02:32 PM

I remembered I had an old friend that used to have a 1982 YZ490 some years ago. So he comes over and takes a look at it, and messes with it and gets the gears lined up but now the selector star does not meet the end of the thing on the shifter shaft that turns it (selector star doesn't stick out far enough now).

He did say that it looks like every gear is brand new and I agree. There is no wear, no gouges, no pits nothing. It looks like the guy that had it before me put in entirely new transmission internals.

So I ask him what happened to his 1982 Yamaha YZ490? He says he split the cases and couldn't get it back together so he took it to the dump. I wish he would of told me that before I let him start messing around with my Transmission.

He thinks I should take it to the shop. I know most will agree.Yet...I am going to try to locate my Manual or purchase another one and try to do it all on my own.

I just want to be riding.

stainlesscycle 01-15-2013 02:49 PM

i'm assuming you have the cases back together right? or are you fiddling around with it trying to get it to work not together...?

so shift selector drum end is not far enough out of the case to meet with selector ratchet? is the shift detent (spring loaded shift position stopper - part #3R4-18140-00-00) lined up properly with the groove on the selector drum - i guess it could be hanging up on drum which binds things up?? - if cases are back together can you manually shift the trans by turning the end of the selector drum by hand? ( you will need to turn output shaft by hand to aid the shifting...)

is the selector drum firmly and fully inserted in the right side case? the shift detent can get in the way if it's not put in the right place...you may have to pull it back and out of the way when you insert the drum, then let it snap back into the groove..

i looked at pic - USUALLY i install the shift selector rod/ratchet after the cases are back together - i assume you can do that on this motor - it's just one less thing to dick with when you're trying to get the cases back together...

FJ_Kevin 01-15-2013 06:51 PM

Alright, I'll take a crack...
 
These usually go together pretty easy.

First, are you sure all the gears are in the right order on the shafts?

You can put them together on the bench to make sure the gears on each shaft mesh with their partners on the other shaft and the shafts are still parallel (boats.net will also list the number of teeth on each gear if you need to check).

If you are pulling parts from multiple sources be careful about using the correct shift fork in the right place. Any chance a 465 fork from a 5-speed is in there?

Good luck, let us know how it turns out!
Kevin

athomerecords25 01-15-2013 09:30 PM

Quote:

Originally Posted by FJ_Kevin (Post 20494107)
These usually go together pretty easy.

First, are you sure all the gears are in the right order on the shafts?

You can put them together on the bench to make sure the gears on each shaft mesh with their partners on the other shaft and the shafts are still parallel (boats.net will also list the number of teeth on each gear if you need to check).

If you are pulling parts from multiple sources be careful about using the correct shift fork in the right place. Any chance a 465 fork from a 5-speed is in there?

Good luck, let us know how it turns out!
Kevin


You may be on to something as my Shift Fork that has a number 2 on it, I believe has 4-5 on the flip side. I will go into the garage and check for sure tomorrow.

I think I am going to halt on everything until I can order another Manual.

bluebye 01-15-2013 09:38 PM

Threads on the countershaft are DEAD.

athomerecords25 01-16-2013 08:34 AM

Quote:

Originally Posted by bluebye (Post 20495628)
Threads on the countershaft are DEAD.

Good eye.

athomerecords25 01-16-2013 09:24 AM

3R4-18140-00-00
STOPPER LEVER ASSEMBLY

One last question before I leave this project alone for a little while. Is the Stopper Lever Assembly supposed to lay slack? Or is it supposed to have tension to it (it has the spring there) or be connected to something?

Thank You everyone for all of your help.

stainlesscycle 01-16-2013 09:34 AM

it needs to have tension on it. it's what stops the barrel from slipping into another gear. it is the positive stop for each gear..

athomerecords25 01-16-2013 08:18 PM

Quote:

Originally Posted by stainlesscycle (Post 20499198)
it needs to have tension on it. it's what stops the barrel from slipping into another gear. it is the positive stop for each gear..

stainlesscycle,

I have been seeing your posts and information. I haven't been ignoring them. I am a single father so I get very little online time. I don't really get to type much and then a child needs me.

From your post earlier. I still have the Bottom End unbuttoned and am messing with it and trying to get everything to work right before I button it all back up, that way I won't have to resplit the cases if I didn't put everything back together correctly.

What is the Stopper Lever supposed to rest on if anything?

I don't know if my Shift Fork that has a #2 on the front is supposed to have a 4 5 on the back of it or does that mean it is from a YZ465? The 1983 Yamaha YZ490 is only a 4 Speed. and only has 2 Shift Forks.

I am so frustrated. I don't get much free time and have been working on this bike for some time. I can now see why my buddy just took his 1982 Yamaha YZ490 to the dump. You get frustrated.


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