Breva 750 Gearbox..... Again

[Muzz]

Yo Mal. I thought it was the V7lll that had the 6 speed. May be wrong there though.  The injected Nevada will be the same.  The carbed Nevada probably has the sometimes problematic early pattern pre-selector fork fitted.

Will be good to know just what fits.  I don't think this one will be long for this earth.

[malik]

Yo Mal. I thought it was the V7lll that had the 6 speed. May be wrong there though.  The injected Nevada will be the same.  The carbed Nevada probably has the sometimes problematic early pattern pre-selector fork fitted.

Will be good to know just what fits.  I don't think this one will be long for this earth.

Then that's something to watch carefully (& photograph) (the pre-selector fork) when I get to take the carbed Nevada's box apart. I seem to remember the Nevada box also has a drain plug at the bottom front like some of the big blocks. There may be other differences. But there's grinding noises when the main shaft is turned, I take that to indicate that the bearings are shot. Want to look in there anyway - need to find out how to ensure that the selector shaft stays rigid on reassembly, and not flop around.

[Muzz]

Then that's something to watch carefully (& photograph) (the pre-selector fork) when I get to take the carbed Nevada's box apart.

Difficult to tell with the naked eye Mal. If you can push the forks fully back in to the body it is the early pattern.  Because of the slight repositioning of the rivets the later pattern will not allow you to do this.

[Muzz]

While I was putting everything back together I took the time to run up another gearchange linkage.  The original one used to bend; I always thought it was very light. Measured the exact length that I needed and lathed down a it of 12mm bright steel, and threaded each end so that when it was assembled there was no thread showing.  Seems to work fine and hopefully this won't bend.

Took it for a few miles around town.  Box works fine.  4th is just audible, I thought it would have been worse.  5th sounds terrible.  Called in to Ripco and bought a couple of bottles of Moreys and threw some of that in.  A bit quieter but not much.  May last a bit longer.... Sucked a bit of oil out before the Moreys went in and I could just see the incandescence in it so doesn't look good.

Never mind, around town up to 4th is just fine.

[sign216]

Muzz,

I don't know what to say.  I know some riders used to live w the 5th gear howl, and their bikes would run that way for miles and miles.  One in particular, from Spain, but I think he (not the bike) has left this earth.  Sad that I can't reach him anymore.

You need 5th, ... but you also don't want to go crazy in this.  Not sure what to say for the next step. 
Well, keep us posted.

Joe

[Muzz]

At the moment Joe 5th is being used basically as a spacer.

Starting the scout around for a second hand box at this stage.  Pete Morcombe of Reboot Guzzi spares has one but it is off a carbed Nevada. Not sure on whether that is the best way to go.  It is affordable but a bit more research needed I feel.

This afternoon's job is fit the other neutral sender.  Now I have my original one in my possession I can see that the one from the box Pete sent us didn't have the plunger in it.  No wonder it doesn't show neutral.

[stubbie]

My Breva 750 whines like that. Not had a problem yet. It is rather annoying, especially going down hill when it starts to free wheel.

[Muzz]

My Breva 750 whines like that. Not had a problem yet. It is rather annoying, especially going down hill when it starts to free wheel.

When the gears were new (x2) the box was dead quiet. Every 12,000 big chunks come off 5th (and now 4th as well).  That's why it whines, in fact it sounds like a siren.

[Muzz]

I finally ended up getting a 2006-7 Breva gearbox out of the States on ebay.  A firm of bike wreckers, The Motorcycle Guys had wrecked a complete bike, minus the gauges because something rather heavy obliterated them.  Got a couple of other bits from them at the same time.

Firm was absolutely excellent to deal with.  good communication, came to the party with freight and pricing, and had the box in NZ within three days.  The, NZ Customs sat on it for about 9 days before making any contact.

Everything was buttoned up and a trial ride undertaken; all seemed good.  Went for a longer ride today and everything still look and sounds good. Nice to be on the bike again and not have it sounding like a cop car.

Hopefully, this box won't give the problems that the original box did.

[Chuck in Indiana]

  The Breva box I have in AeroLario has been fine. Hopefully yours will, too.. finally. 

[Muzz]

The Breva box I have in AeroLario has been fine. Hopefully yours will, too.. finally. 

You and me both Chuck!

From all the experts consulted no one has had the litany of disasters that mine has had.  <shrug>

[steamdriven NZ]

I picked up a rag in the garage yesterday and it smelled of gear oil......hopefully the last time it's your gear oil in my garage!

Good job, pleased you're mobile again 

[Muzz]

I picked up a rag in the garage yesterday and it smelled of gear oil......hopefully the last time it's your gear oil in my garage!

You and me both Kev!

I took it out yesterday afternoon, over Dyers pass, around from Govenors Bay, up Gebbies pass and branch off and do the Summit Road to link back on to Dyers.

Box felt good. A bit of whine from the transfer gears and a slight whine in 4th. Top dead quiet. Just about got taken out on the Summit. Coming up to a corner and a car came around on my side of the road....and kept on coming. For the first time on that bike I actually locked the front wheel, front gave a bit of a flick but I stayed upright, and at the very last minute the car headed back to their side of the road.  If I had been in a vehicle we would have hit.

It's a narrow gutted road with a drop on my side.  With nowhere to go when someone is coming straight at you it's a bit unnerving.

[malik]

That was a decent miss, Muzz. An extra birthday present. Won't need a lottery ticket for at least a month.

[Muzz]

Smell it Mal, I was sitting in it!   It was pretty close.