Laverda 750 SFC 1974 replica

Need infos :D

How much axial play must be between selector drum and engine block? i measured mine and there is 0,4mm
 
You need to check gear selection.
Put the gear shafts with the cogs in the lower crankcase and go through the gears. Make sure that the cogs are engaging properly and that there is a sufficient gap between cogs to allow for heat expansion.
Paul
 
Paul Marx said:
You need to check gear selection.
Put the gear shafts with the cogs in the lower crankcase and go through the gears. Make sure that the cogs are engaging properly and that there is a sufficient gap between cogs to allow for heat expansion.
Paul
Click to expand...

I have done that everything engages ok. Currently i have few problems radial play in selector drum (i can feel it but don't know how much play is allowed there ) i tried to undo the nut on selector drum but without success is there any trick?  I also have bad bronze bushes some of them are cracked,.. and a lot of radial play. And i have to figure it out which gear is which so that i can measure axial play  so that i can buy correct shims. I have only done that few times on ducati but it's not the same so i'm a little lost here :D
 
If it's the same as a triple gearbox then you need a slimmed down spanner to free the nut holding the selector drum.
 
Paul Marx said:
You need to check gear selection.
Put the gear shafts with the cogs in the lower crankcase and go through the gears. Make sure that the cogs are engaging properly and that there is a sufficient gap between cogs to allow for heat expansion.
Paul
Click to expand...

By the look of the new avatar, seems Paul is a specialist in clutch crutch activation.
 
Grant said:
If it's the same as a triple gearbox then you need a slimmed down spanner to free the nut holding the selector drum.
Click to expand...

I can reach the nut with normal spanner but i can't loose it. Question for those that have done this. How much was the nut tighten?
i put a block of wood under the selector drum and than i tried to undo the nut. But i stopped because i had a feeling that i will bake something :D
 
Nut is normally tight for its size - in the unlikely event you do break something - there are loads of spare ones around I should think.  - Regards - Phil
 
I run to another problem :D  i think that  5th gear on  layshaft was installed wrong way around . And i don't know if i have original spacer between 4th and 5th. there are really rough marks left from machining  and there is a lot of radial play (i know that it's not so importat)

i'm looking exploded views in manual and it looks like that raised edge in center of 5th gear is facing to the spacer is this correct ?. i also have shim between 3th and 4th gear on layshaft was that from factor ??

 
I have another question. bush in my clutch drum fell out and someone mention me that it can be modified using needle roller bearing as on some later laverda models. I'm wondering if shaft is hard enough so that needle roller bearing can run on it ? because bush have bigger contact surface area and is softer as rollers in bearing. http://www.skf.com/group/products/bearings-units-housings/roller-bearings/needle-roller-bearings/needle-roller-bearings-with-machined-rings/with-machined-rings-wo-inner-ring/index.html?designation=NK%2022/16&unit=metricUnit
 
I've converted a couple to needle rollers without issues.  Only difference between twin and triple mainshaft is the length, hardness etc is identical.  Bushes will wear soft shafts very quickly...

Can supply oversize bushes. :D

piet
 
sfcpiet said:
I've converted a couple to needle rollers without issues.  Only difference between twin and triple mainshaft is the length, hardness etc is identical.  Bushes will wear soft shafts very quickly...

Can supply oversize bushes. :D

piet
Click to expand...

What bearings did you use same as on the link above? 
 
Simply took one (2, actually) out of the box for the triples, #22 805 443, gabbia a rulli 22x28x16... life's simple.

piet
 
dsc0004.jpg
  is this gear instaled ok or is it rotate for 180 degrees
 
don't forget the pin retainer for the selector shaft, opened a number of engines where that has been left out by some previous engine builder
 
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