85 250r 5 speed?

[Tri-Z Pilot]

WHAT?!?!

Guess I should have been a little more clear on that. You usually see mx guys doing it, they usually only need 2nd and up since their ing out of corners all the time.

[Nick_R_23]

Getting off topic, but the dogs on the trans gears are angle cut, so they can "slide mesh" together, and then they are sometimes also put together with springs between them so that when one is engaged, it snaps together the next one. Atleast thats how I understand it.

So once you kick it into gear, its almost like a 'domino effect' and the first gear knocks the next gear into place and so on??

-Nick

[Bryan Raffa]

well not really off the topic ..a few of these guys could have stumbled on some cut gears possibly...or verry well took 6th out for close corse racing

[NINJA]

Any update on this NINJA? I'm curious to know.

Man I forgot about this post! I had tried to call Craig and he wasn't in. I'll try calling again but obviously next week cause now it's the weekend. I WILL get down to the bottom of this though. You guys all know how I love debating things like this. I will keep you posted.

[GPracer2500]

So once you kick it into gear, its almost like a 'domino effect' and the first gear knocks the next gear into place and so on??

-Nick

No, no, no. They're called override transmissions and they're setup to skip gears. There's no "auto-shifting" involved. For example, in a 1-4 override drag tanny you'd shift out of 1st and the next gear would be 4th. They are common in drag Banshees and available in various combinations: 1-4, 1-5, 2-5, 1-6, etc. Sometimes all the gears remain in place and sometimes gears are removed.

[GPracer2500]

Getting off topic, but the dogs on the trans gears are angle cut, so they can "slide mesh" together, and then they are sometimes also put together with springs between them so that when one is engaged, it snaps together the next one. Atleast thats how I understand it.

What you're describing is called undercutting. The gear dogs are backcut slightly to create a more positive shift that's less likely to disengage itself. Here's a pic that shows a set of gear dogs engaged. The dogs are cut in a slight trapezoid shape so when they first contact each other they are inclined to pull themselves together into full engagement. A tranny with undercut gear dogs is still shifted like any other sequential gearbox.



Many sportbike motorcycle transmissions are undercut from the factory. And it's a fairly common racing mod for sequentially shifted trannys in racing engines that weren't originally cut that way. I had a roadracing tranny undercut. It's a neat feeling. You just barely engage a gear and you can feel the gears pull themselves together the rest of the way almost by themselves. You can have just the upshift dogs undercut or both the upshift and downshift dogs.

I've never heard of springs being added.

[GPracer2500]

Unless someone can provide very convincing evidence that proves otherwise: All '85+ ATC and TRX 250r transmissions are 6 speeds unless something is broken or modified.

[Rustytinhorn]

Here is a 250r with a 3 speed tranny.
http://www.ksl.com/index.php?nid=218...lpid=2&cat=145

[NINJA]

I posted the update to this thread in the first post.