Won't shift into third when cold????

[Radioguylogs]

My Recollections

Thanks Phil.

Ben: Accidentally kept you re-entertained for a half hour.

I have read the debate about hardening, and the only thing I have to add is that I toured the Chrysler transmission plant in Kokomo, Indiana 1978 or 1979. At that time, the technology for hardening gears was a carburization furnace with hydrogen and carbon in the atmosphere at very high temperatures.

I remember asking how if there was a risk of explosion, and the guide said it never happened before. A few weeks later there was an explosion and 3 guys died. That stuck in my memory, but I don't find anything when I search for it online today. Maybe my memory is fogged by college vices.

Anyway, carburization would harden the surface of gear, but I don't know how deep. Probably less the Dremel amount.

[donebysunday]

2nd gear fix

When I did my one and only 2nd gear angle shaping of dogs and slots and washer swap fix with that Dremel barrel stone it went well. The guy I sold the bike to stopped by this summer and after 5 years it's still good.

On another bike I wanted to lower the fender by elongating the bolt holes there by dropping it down 1/4"-3/8". I still had the barrel stone I used on the dogs and slots to fix that trans. I went to work on the bolt holes in the fender and nothing, the stone would not cut. I went to Ace and bought two more of the same stones and they would not bite into the metal of the reinforced/inner brace of that fender, I used a rat tail file that did the job. ?????

[DiverRay]

The chrome on the fender is harder than the gears. I use a rotary file for the drill and it works well on most metals.

[donebysunday]

The chrome on the fender is harder than the gears. I use a rotary file for the drill and it works well on most metals.

Really wasn't any chrome it was a Midnight front fender and black chrome does not match the hardness of real chrome.
I feel the temper/hardness of the gears slot and dog surfaces are not as hard as we generally think.
Or IMHO the transmission gears/teeth are hard, dogs/slots are not all that hard/hardened. The point I was trying to make back near the beginning of this thread, when I mentioned using an automatic center punch impact depth to determine the hardness of different surfaces of the gear/dogs. The gears teeth are hard but dogs/slots themselves are soft and very malleable. Yamaha skimped on the hardening of the entire gear. Some one more knowledgeable may see a reason for a softer metal inner gear, less resistance, easier lubrication ? ? ? Or cost cutting ?

[DiverRay]

The dogs are probably not hardened to keep them from breaking. If the gear was hard all over, the shaft would have a lot of wear as well as the dogs. soft + soft wears a lot, hard + hard wears a lot, but soft+hard will last longer on something moving at different speeds.
Also, if you push the bike with hardened dogs, you can fracture them easier than "normal" steel. Hardening also make the steel brittle, and a lot easier to fracture with a "hit" at one point.

[donebysunday]

The dogs are probably not hardened to keep them from breaking. If the gear was hard all over, the shaft would have a lot of wear as well as the dogs. soft + soft wears a lot, hard + hard wears a lot, but soft+hard will last longer on something moving at different speeds.
Also, if you push the bike with hardened dogs, you can fracture them easier than "normal" steel. Hardening also make the steel brittle, and a lot easier to fracture with a "hit" at one point.

I had not thought of the hard/hard, soft/soft, soft/hard or hard/soft is basic ying yang