74 SF2 Disappearing Gears ????

M

mtnduc

Junior member
OK .... as I try and figure out the final Lav gremlins this popped up today.

The bike has never shifted in to 5th since I've been riding it the last 2 weeks.  In fact, until I checked the Green book tonight I thought it was a 4 spd (go ahead an laugh here) but, today it wouldn't shift past 3rd.

Comments/diagnosis/etc........

Still chasing my Generator/Voltage Reg issue in tandem but, that's for another post.

TIA

Brian
 
Brian,

You will need to remove the small gearchange cover (place a small block under the RH centre stand leg or lean the bike against a wall, but best to have the rear wheel clear of the deck) and loosen the larger sprocket cover.  With the selector mechanism and lever in situ, juggle the cover around a bit whilst changing through the gears.  Most probably you will end up by forcing the cover slightly towards the front of the bike, allowing the selector sprockets to mesh more loosely.  Once all gears can be selected, slightly tighten the cover and change through the gears once again.  If all is OK, tighten the cover and re-fit the other bits, replace the oil that might have drained and off you go.  If selection becomes difficult, the selector gears linking the outer selector with the inner selector drum are binding at a certain position.  Put the gearbox in the final gear it reaches, loosen the cover again and give it a tap forwards/backwards/up/down with a hide or plastic mallet till you can select all gears.

Production tolerances sometimes allow the gears between the 2 selector drums to bind a bit, often making it impossible to change through all the gears, usually stopping at 4th.  Giving the gears more room solves the problem.

HTH,
piet
 
Piet -- Thanks again.
Any chance you are writing a Laverda Owner's Manual for DUMMIES book because I think I need a copy!! :D

Another stupid question: While I'm performing the gear change operations am I doing this with the engine running or off?  I'm assuming off but, odd repairs like this may require it on.
 
Brian,

Please do not perform with the engine running.... or are you in some form suicidely endangered??

Just turning the rear wheel by hand is enough to spin the gearbox to allow the gears to change.

No, don't think I'd like to write a book.... :D

piet
 
Well, after spending a fair bit of time with some tools and a mallet I think I have discovered the gear change issue.
Ahhhh the joys of buying a bike in parts ...... the 5th gear pin in the gear selector was missing and the 4th gear pin fell out and was laying in the oil when I popped off the side cover..  After talking to Wolfgang I discovered there is supposed to be a large washer between the end of the gear selector shaft and the case cover that assists in keeping the pins in place.

New parts on the way!!

Now we'll see how bad I messed up the eccentric when I put it all back together.

Thanks to all ..... again!!!!
 
Ah, the joys of learning by doing! It's always nice when it is something simple to take care of. Over the years I've found most of the problems are in one way or another "operator error" instead of the bike itself.
If you do not have a parts diagram simply look into Andy Wagner's website. He has diagrams to go with his part numbers and quite often shows most of what you need to know as to how the parts go together.

Tom
 
Brian, stick with it. These are teething troubles.
Just think, soon they will be behnd you, and then you can enjoy the bike in the knowledge it is finished and raring to go.
Use it hard and it will reward you.
 
Figured out the issue with the missing gears.
The pin for 4th gear in the gear selector shaft fell out and was laying in the oil, the pin for 5th gear was never there.  Thanks to Wolfgang I also discovered there was supposed to be a large washer on the end of the selector shaft that holds the pins in place.
All installed last night and Viola ....  she's a 5 speed again.

Thanks to all!

After 9 years and last being titled in 1984 she's a rider!!!
 
How about a picture or two of the finished bike? I certainly like to see please. Not enough 750 pics on here to look at or draw inspiration from
 
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