1st Gear - Broken Tooth

[Viper]

I thought my first gear was broken. First gear would work, but would clank abit.

I pulled the engine apart, and lo and behold first is broken.

Does anyone have any recommendations to source out a new gear?

Will any other bike's gear fit as a replacement?

My xs is a 78 special, which i've heard has different gears then the earlier models. Is the difference the 2 lines on the top of the gear teeth?

 

[xsjohn]

Looks like a later trans with the groves across the tops of the teeth...(if I am seeing it correctly from the picture)..not sure a older trans gear will mesh properly.....might should stay with a later 78+ replacement.......ebay whatever..............xsjohn

 

[72XS2]

I just find it on eBay.

http://cgi.ebay.ca/NOS-1972-84-Yama...rcycles_Parts_Accessories?hash=item2c47f06efd

 

[xsjohn]

It says 72-84 ......guess that the trans modification on the later models didn't include 1st gear.........wondered about that........xsjohn

 

[Viper]

Can anyone reconfirm that more ? Are all 72 to 84 first gears the same?

 

[xsjohn]

Go on line to a site that gives the part numbers......OEM Yamaha Parts ect......and check the early numbers as compared to the later numbers..........try this site or others for the part numbers......click on OEM yamaha parts......this site I use may have the part numbers assoiciated with the parts.....xsjohn

http://www.stadiumyamaha.com/

 

[Viper]

That's excellent. First gear remained the same over the years, the other gear wheels changed.

Why did they add the grooves? Less Noise?

 

[xsjohn]

You are good to go if the #'s match........The grooves across the top of the gears just marked the gears that were changed so you would know...78+...think it was the pitch of the teeth as an improvement in noise I would guess....many have commented that they couldn't tell the difference between transmissions....who knows.......?

xsjohn

 

[XSLeo]

Ebay usually has complete transmissions at reasonable prices, just swap out a complete tranny. That way all the gears will mesh right. And if you get a late model tranny you can put Mike's new 5th gear in. A few less revs at cruise speed.