TransMISSION Impossible?

[Guest Rev'n Ahead]

OK, so one more go at the 1st Gen Transmission issues:

 

My 84 with 51.000km is popping out of second, into neutral, when accelerating under load. I double shift up into 3rd and it keeps going fine... just know it's going to get worse not better.

 

So, here's my question for the PROs out there - can I swap out the transmission from a 1998 1300cc bike in and mate it up to my 84 1200cc engine? I found an 89 with a messed up engine which I can get for cheap... seems a lot of the newer bike is in better shape than mine so I'm thinking of stripping it and using some parts... primary is the transmission though.

 

WILL THIS WORK?

Is it worth doing? I'm not looking forward to rebuilding my transmission... and having it go again in 40,000km...

 

Thanks EVERYONE.

[dingy]

If it is an 89 it will fit right in, you said 98 at one point which is Royal Star era.

 

Depends on what is wrong with motor also. I got a used 1300 motor last year and it had a bad bearing that parts of it went through the middle gear and chewed it up.

 

Gary

[Peder_y2k]

The 1989 transmission is interchangebale into the 84. Just a lot of work, and lots of parts and pieces to account for. Take lots and lots of pictures for reference, because you'll need them. it may take less time and involvement to simply repair the '84 tranny with the 2 improved parts (washer and clip) and leave the '89 alone. With the repair, one can expect the tranny to outlast the engine, or you (your interest in the bike)......... whichever comes first.

-Pete, in Tacoma WA USA

'83,88

[dingy]

The 1989 transmission is interchangebale into the 84. Just a lot of work, and lots of parts and pieces to account for. Take lots and lots of pictures for reference, because you'll need them. it may take less time and involvement to simply repair the '84 tranny with the 2 improved parts (washer and clip) and leave the '89 alone. With the repair, one can expect the tranny to outlast the engine, or you (your interest in the bike)......... whichever comes first.

-Pete, in Tacoma WA USA

'83,88

 

Depends on how long the bike has been run like this. It can also take out the gear pair that is disengaging and one of the shift forks.

 

Gary

[Dano]

I guess you'd want to undercut the pins(5th gear) and slots(2nd gear) then, that way you can NEVER get 2nd gear to slip again! :cool10:

[Marcarl]

I guess you'd want to undercut the pins(5th gear) and slots(2nd gear) then, that way you can NEVER get 2nd gear to slip again! :cool10:

That's what I would did and would do again.

[DragonRider]

That is exactly what my 83 did and I did a tranny swap on my 83 with one from an 86, just replaced everything from one to the other. There is a writeup in the tech section on pulling the engine that makes it fairly straight forward. I did it, so just about anyone can do it. You will need to replace all the gaskets because you have to split the cases to get to the tranny, you may need to straighten or replace the shift forks, all I did was a tranny swap and now my 83 runs like new. Here is the link to doing the 2nd gear repair. Good luck.

 

http://www.venturerider.org/forum/showthread.php?t=508

[stanG]

I would have to agree with Marcarl. Repair the existing trans with the new parts. When I did mine I replaced the clips and washer, the 2/5 shift fork and undercut the gears. I had my brother undercut the gears with some precision grinding equipment but there is good info on this forum on how to do this on a drill press. I have had zero problems and can hammer second gear as hard as I want now. While I had it opened up I also replaced any seals and orings along the way. About $175 into parts and some serious labor to remove the motor and open it up but I did it all myself in the off season.

[Condor]

Instead of repairing the tranny you might look at R&Ring the entire engine with one from a 1300 MKII. Most of these engines go fairly cheap on the used market. Why?? Because they last so long and after the 83-85's 2nd gear problem are pretty much bullet proof.

http://www.cast-aways.com/CONDORPICS/Sam-Side.jpg

[icebrrg3rd]

If I had to do it again, I would go with a whole engine swap. Less hassle, easier to do, and you don't have to worry if you forgot to put something back in and have to pop it open again . I'm not saying that it's overly difficult to replace 2nd gear, I'm just saying to me it's worth it to do a whole engine swap and skip most of the headache. Hindsight is 20/20.

 

-Andrew