1st gen/2nd gen trans swap...big update

[Venturous Randy]

For those few of you that have expressed any interest in the 2nd gen transmission being a viable option in a 1st gen engine, here is a great update.

I received the forks and drum today and after doing some measurements on the location of the shifting slot that controls the slider for 1st and 3rd gear, it appears that Yamaha has shifted that slot approximately .080 toward the center of the engine. As noted in the earlier post, that slider was off using the 1st gen drum to the point that the dogs on 1st gear were touching the mating gear slightly and the dogs on the other side of the slider were just barely going into 3rd gear when that gear was engaged. It does appear that the forks themselves are identical. The other change is the tabs that were bent over the end of the pins, the ones that tend to open up and allow the pins to fall out, are no longer there and now it is a machined casting. This is another big improvement in this transmission.

After replacing the forks and drum, I set the gearsets in place and it appears everything aligns perfectly and all sliders engage exactly as they should and have the proper clearances when not engaged. All the gears changed perfectly as I went thru the shift pattern. Now, I will gather up all the necessary seals and gaskets to start assembling this thing.

I will add some pictures and the last one will be the 2nd gen gearset in place in a 1st gen engine with everything aligning as it should.

RandyA

[Squeeze]

Great Info, Thanks Randy

[Lil Venturous]

looks good.