75CC Wiring Diagram

C

chris78jota

Senior member
Location
England
Hi,
does anyone have a wiring diagram for the 1953/54 75cc models please? (That run without a battery).

I have a copy of the 100cc (battery) version that someone kindly posted a few years back, but it's not the one I need.

Thanks in advance

Chris
 
chris78jota said:
Hi,
does anyone have a wiring diagram for the 1953/54 75cc models please? (That run without a battery).

I have a copy of the 100cc (battery) version that someone kindly posted a few years back, but it's not the one I need.

Thanks in advance

Chris
Click to expand...

I'll have a look. Not sure diagram is the right term.

Paul
 
(Paul answered while I was waiting for my internet to come back, but I'll post this anyway)

I have a '53 75cc, there are only about 4 wires on the thing! :)  No battery or fuses, just two coils in the sidecover, one for ignition and one for headlight/taillight.  What do you need to know?

Of note is that should you wish to remove the RH engine sidecover, you need to carefully disengage the gear selector key from the groove in the selector shaft without pulling the central selector shaft out.  If you do all the gear engagement balls fall out and you have to split the cases to correct it.  So I have been told by the ever helpful Wilfried, who helped me get mine going when he was here.
This axially sliding selector shaft style box is similar to those used by Hodaka, and amusingly it bears some similarities to a modern motogp seamless shift box.
 
Cheers guys, many thanks for your advice and help.
Wiring is a mystery to me, so I'll take some advice from people and come up with something simple.

Fascinating comment too about the sliding selector :-) unfortunately I'm not sure there's enough room to add two or three more gears to match the MotoGP machines! 

The selector balls are unlike any needle rollers I've seen - is it possible to get replacements from anywhere? - one of the gearclusters I've accrued has none.
Chris
 
This gearbox design was very popular with european tiddler manufacturers of the 50's and 60's.  Simple and effective, but gear selection is often quite vague, see Z?ndapp!  I noticed the similarity to the modern seamless boxes as well... another case of going full circle!

As far as I can tell, the little pins are unique tto Laverda.  I think they are no longer stocked by local Laverda dealers. :D  Most other designs I've come across used simple balls to engage the gears through the hollow mainshaft.

Chris, as Steve stated, the wiring is VERY basic.  You could consider the battery as an add-on, simply leave out the battery circuitry from your diagram and you should be quite close.

piet
 
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