Re-engineering the Shift Spring

[VeeEleven]

On 7/3/2020 at 11:08 AM, VeeEleven said:

*snip*....
Road test report to follow once the weather clears.

My box was quite good before, with just the occational return binding, but felt even better during a quick 10km round the block. Crisp shifting and no binding.

Add another happy customer to the list.

[Chuck]

Always glad to see a satisfied customer..

[JRD]

Chuck, do you or Scud still have any of the new shift springs available?  I keep one of the old style in my tool kit just in case my original decides to break.  It's always on my mind everytime I take the bike out and have decided to just go ahead and change the old one out while in my garage and not leaned over on some roadside in 90° heat.

 

Jerry

[Chuck]

Yeah, I'm sure Scud has some. Don't worry, be happy. It was always on the back of my mind, too. It's *possible* to change one on the side of the road, but I'd hate to try it.

[hammershaug]

It's gonna be rain tomorrow, so finally time to replace the gear change pawl spring. Not sure if this guide has been posted here, but it looks good to me:

https://sites.google.com/site/motoguzziv11rossocorsa/home/gearbox-pre-selector-spring

 

Thanks for the springs, Scudder!

[footgoose]

1 hour ago, hammershaug said:

It's gonna be rain tomorrow, so finally time to replace the gear change pawl spring. Not sure if this guide has been posted here, but it looks good to me:

https://sites.google.com/site/motoguzziv11rossocorsa/home/gearbox-pre-selector-spring

 

Thanks for the springs, Scudder!

that looks good, it's been awhile since I did mine. One of those allen head bolts at the bottom (behind the frame rail) is a bit tricky. I sacrificed a wrench (cut it off) and used a small steel tube as a cheater bar for adequate torque. Somewhere on the forum is a Lucky Phil thread on "finessing" some of the other bits... while your in there, very worthy read.. I used three-bond 1194 (grey) to seal her up.

[docc]

9 minutes ago, footgoose said:

that looks good, it's been awhile since I did mine. One of those allen head bolts at the bottom (behind the frame rail) is a bit tricky. I sacrificed a wrench (cut it off) and used a small steel tube as a cheater bar for adequate torque. Somewhere on the forum is a Lucky Phil thread on "finessing" some of the other bits... while your in there, very worthy read.. I used three-bond 1194 (grey) to seal her up.

 

[Lucky Phil]

48 minutes ago, footgoose said:

that looks good, it's been awhile since I did mine. One of those allen head bolts at the bottom (behind the frame rail) is a bit tricky. I sacrificed a wrench (cut it off) and used a small steel tube as a cheater bar for adequate torque. Somewhere on the forum is a Lucky Phil thread on "finessing" some of the other bits... while your in there, very worthy read.. I used three-bond 1194 (grey) to seal her up.

Scudd also came up with a needle bearing option for the detent arm instead of the original Guzzi plain roller that was't covered in my thread. That would also be a good upgrade to do while you're in there.

Ciao

[hammershaug]

The new and reinforced spring from @Chuck and @Scud in place.

 

The old one has another geometry. Must be compressed?

 

A pretty straightforward task, except for the placement of selector gears when re-mounting... I didn't note what gear it was in when tearing down the gear cover. I think it was in 1st, but I moved the gear level pedal when I took it off and accindentally changed gear. Can I see it from this photo? 

 

[Chuck]

Your old spring was ready to break from over travel.

From memory the gearbox needs to be in neutral for the dogs to line up, so from memory you can't assemble it incorrectly.

[hammershaug]

Thanks, Chuck! I will set the gearbox in neutral and try to enter the side cover back on. Good to hear I can’t assemble it wrong...

 

I’m thinking about replacing the seal around gear level shaft. Anyone had a leak from it?

[Bob Maynard]

Many years ago, a leak around the shift shaft was one of the things that stopped me from buying a nice greenie. Which I regret to this day.

Don’t know how common it really is.

[hammershaug]

Neither do I, but I’m going to the nearest town and try to find a replacement seal. One less concern. I have plenty enough.

Thanks for sharing such a sad story. Someday you’ll find a 100% proofed Greenie

[al_roethlisberger]

7 hours ago, Chuck said:

Your old spring was ready to break from over travel.

From memory the gearbox needs to be in neutral for the dogs to line up, so from memory you can't assemble it incorrectly.

 

It's been what... 15-16 years since I broke and replaced mine with a factory replacement (to be replaced with the new one soon) but as I recall you are correct.  I don't think it will go back together unless it all lines up, so it kinda is fool proof 

 

 

[Jim in NZ]

Before you put the sealant around the outside of the cover, you want to do a "dummy run" and offer up the selector plate to the gearbox and make sure that it is going to go straight on. Otherwise the sealant will skin over while you muck about with it. The gear selector mechanism must be in the same gear as the gearbox for it to fit. It is easiest to have them both in neutral, unless you know for certain what gear the box was in when it locked and you haven't moved any of the selector forks.

You can set the gear selector mechanism in neutral, and put each of the selector forks in the gearbox in the middle of their travel, which corresponds to the box being in neutral. You might still have to slightly adjust selector fork positions by trial and error until they match up exactly.

Then clean the mating surfaces of any oil, apply sealant sparingly, and bolt up quickly.

Good luck!   - Jim.