erickson483 Posted April 17, 2012 Report Share Posted April 17, 2012 I was getting ready to assemble my cases and while testing the transmission for shifting, I found that It does NOT want to shift from 3rd to 2nd. Going from 3rd to 2nd is the only trouble spot. I pulled the trans gears out and went through the gears again with just the forks and drum in it. The shift fork 1 closest to the shift star is getting stuck on the drum. From there I took everything out and saw a flat spot worn into the shift fork and a flat spot on the drum where it is transitioning between 3rd and 2nd. So my question is should I try to repair the flat spots, buy a new fork, or buy all new forks and a new drum? Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted April 17, 2012 Report Share Posted April 17, 2012 I was getting ready to assemble my cases and while testing the transmission for shifting, I found that It does NOT want to shift from 3rd to 2nd. Going from 3rd to 2nd is the only trouble spot. I pulled the trans gears out and went through the gears again with just the forks and drum in it. The shift fork 1 closest to the shift star is getting stuck on the drum. From there I took everything out and saw a flat spot worn into the shift fork and a flat spot on the drum where it is transitioning between 3rd and 2nd. So my question is should I try to repair the flat spots, buy a new fork, or buy all new forks and a new drum? are you spinning the trans shafts while testing? 90% of the time the transmission won't seem like its shifting right on the bench. Once assembled and engine running it will shift fine. Post pics of the "flat spots" you are talking about. I'd be willing to bet your drum is fine and it would shift fine once assembled. The drum is hardened and there is not enough play between the forks and the drum for it to wear a flat spot. I've never seen it happen with all the transmissions I've done. - Jared Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 17, 2012 Author Report Share Posted April 17, 2012 are you spinning the trans shafts while testing? 90% of the time the transmission won't seem like its shifting right on the bench. Once assembled and engine running it will shift fine. Post pics of the "flat spots" you are talking about. I'd be willing to bet your drum is fine and it would shift fine once assembled. The drum is hardened and there is not enough play between the forks and the drum for it to wear a flat spot. I've never seen it happen with all the transmissions I've done. - Jared Ya I'm spinning the primary drive when shifting it. Whether the trans is in, or if it's just the forks and drum in, you have to wiggle the shift fork to get it to shift from 3rd to 2nd. It is binding real hard. When the trans gears are in, it won't even go from 3rd to 2nd at all. I have to take the gears out and wiggle the fork by hand to get it to shift at all. Also, my shifting mechanism IS properly adjusted. I'll have to wait til i get home and use my camera to zoom in enough to get a good picture of what i'm talking about. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted April 17, 2012 Report Share Posted April 17, 2012 Bent fork?? Are the ends of any of the shift forks discolored (blue-gold), they should be a nice silver color and should be smooth to the touch all around. If they are jagged or discolored they are likely bent. Issues usually aren't in the gears or drum. Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 17, 2012 Author Report Share Posted April 17, 2012 Forks look good. I wish I could post pictures right now. The only part that is binding is where the knob of the fork slides in the drum. It does not want to slide well. I could just be overreacting, I just hate to have to split the cases again if it doesn't end up working. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted April 17, 2012 Report Share Posted April 17, 2012 Can't say I blame you there. As Jared said earlier, the shifting is hard to bench test. Very rare to have an issue with the gears or drums, but not impossible. Post pictures of the parts if/when you can. Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 17, 2012 Author Report Share Posted April 17, 2012 I hope this works....I'm trying this from my phone. The first two pictures are of the problem fork. The one that is kinda chewed works well. The first picture I tried to get a look at the little flat spot but it's really hard to see. http://m223.photobucket.com/albumview/albums/erickson483/19ffec0a.jpg.html?o=0&newest=1 Let me know if this link won't work Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted April 18, 2012 Report Share Posted April 18, 2012 you sure you have the right forks in the right place? Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 18, 2012 Author Report Share Posted April 18, 2012 Good question. Yes I'm positive. Actually, idk why I didn't do this before. I'll switch the two #1 forks and see if the problem travels or clears up. I'll post my results tomorrow Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 18, 2012 Author Report Share Posted April 18, 2012 Switched forks. Works like a champ Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted April 18, 2012 Report Share Posted April 18, 2012 Make sure you have the right fork in the right place for the pinion gears in the transmissin. One of the pinion gears has a different diameter on the part where the fork rides than the other two. Just double check everything and make sure you aren't shooting yourself in the foot. - Jared Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 18, 2012 Author Report Share Posted April 18, 2012 I noticed the size difference when trying to figure out what the hell was going on. But it's working now so I'm gonna roll with it. Quote Link to comment Share on other sites More sharing options...
Starwriter Posted April 18, 2012 Report Share Posted April 18, 2012 WOW, you have a worn shift drum and a worn fork and you're gonna put the worn fork in the good slot, and the good fork in the worn slot? Drums and forks are around all over the place for dirt cheap. Quote Link to comment Share on other sites More sharing options...
erickson483 Posted April 18, 2012 Author Report Share Posted April 18, 2012 The trans shifts perfect. What more can can I ask? If you didn't see the pictures the wear is really really small. And yes, I'm using them. Quote Link to comment Share on other sites More sharing options...
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