Mainshaft splines refurb' company in the UK?

N

Nick

Full member
Well the Atlas mainshaft fix hasn't worked out so well...Despite a bespoke tight fitting and broader shouldered sprocket the chocolate mainshaft has whittled itself away. So the problem seems to be that Laverda omitted to case harden the mainshaft.

Any recommendations on a UK company that could weld up and recut and case harden the splines at a reasonable price - it's the same problem triple owners get if they fit loose sprockets (except of course triple owners don't experience the problem if their sprockets are tight because Laverda did case harden these mainshafts).

Merry Christmas.

Nick :-)
 
That would be Nigel Billingsley at NBS, Moto Guzzi specialist. Good guy and definitely worth speaking to him, you can get him on 07958 584889.
 
Distortion is going to be the main problem - and a bad one. You may find that after welding it's too bad to recut. If it doesn't distort too badly welding, case hardening could well put it too far out..Metalspraying can do the same as the recipient piece has to be hot enough to bond - which can release inherent stresses - and distort....
Sorry to be a doomsayer but i've been there making gearbox mainshafts and know what you can run into.
Can you source a replacement ?
 
I've been looking at this too here in Germany. There are companies that will make new ones but it all comes down to the price per unit equation. I simply cant afford to have 20 shafts made, sell five, and then have the rest sitting around collecting dust.

Nick keep your eyes peeled for somebody selling 500 Alpino gearbox parts. The shafts are the same but Laverda's supplier got the hardening done correctly. Just about all of the Atlas shafts show wear to one degree or another while all of the 500s I have had here have been fine (I'm sure there are knackered ones too, just haven't seen 'em).

Tom
 
Nick keep your eyes peeled for somebody selling 500 Alpino gearbox parts
Click to expand...

  That could be me - if anyone can identify these parts. They came in a job lot  of loads of cogs etc I got from Bob Dixon - there are some 650 parts in there too - don't know enough about the 8 valve twins to identify it all - I expect someone else can. - Regards - Phil





The gearbox sprocket is on the layshaft - not the mainshaft - I presume that's what you need Nick??
 
All 650/668/750 stuff Phil.

The 500/600s do not have the extended exit shaft.  Probalbly no problem slotting in a complete box if 1st gear doesn't match the original, the shaft extension can be removed, or a 650/668/750 sprocket cover with outriger bearing can be fitted, just omit the hydraulics.  Perhaps a new sprocket retaining plate groove needs to be machined, haven't looked into the spacing of the chain run yet, probably a bit wider than on the early bikes with their skinny tyres.  AfaIk, the clutch fixing method is the same on all 8-valvers.  Bearing locations/dimensions and shaft centre distances are also the same, good chance it will slot straight in.

piet
 
Tom Eatman said:
There are companies that will make new ones but it all comes down to the price per unit equation. I simply cant afford to have 20 shafts made, sell five, and then have the rest sitting around collecting dust.
Tom
Click to expand...

we did the CNC programming for the 180 triple output shaft/final drive gear when we programmed the billet 4th gear for the triple gearbox
I spent that months R&D budget on the billet 4th gears as I needed them more at the time but just used my last new output shaft on the race engine so may revisit these shafts next year
would need to know what interest there is from the various dealers, have already asked Wolfgang who is the only dealer I work with anyway and he is in for a dozen or so
will think about it over the next few weeks



 
redax5 said:
we did the CNC programming for the 180 triple output shaft/final drive gear when we programmed the billet 4th gear for the triple gearbox
I spent that months R&D budget on the billet 4th gears as I needed them more at the time but just used my last new output shaft on the race engine so may revisit these shafts next year
would need to know what interest there is from the various dealers, have already asked Wolfgang who is the only dealer I work with anyway and he is in for a dozen or so
will think about it over the next few weeks
Click to expand...

So, are you putting your hand up for the Atlas ones as well?  Not that I need one at the moment....

 
phil37 said:
Piet -- Are you saying that these shafts would work on a 500/Atlas with a 650/750  g/box sprocket?
Click to expand...

Wouldn't be surprised if they do.  Have wanted to look closer for quite some time, just haven't got around to it.  As both are 6-speed, more or less the same construction with identical shifter stuff (might need the selector forks, really dunno) and all basic dimensions are identical, not much speaking against it. :D

piet
 
Check with your local BMW dealer. I would assume that in the UK they have the same spline problems on the R and K bikes we have here. I have had both an R100RS and K75S splines welded with hard facing and reground. Parts were better then new after the repair.

Here is one place that does the work.

http://www.brunos.us/
 
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