750 Bosch Voltage Regulator adjustment

With more than over 250,000 km with several 750 Laverdas, I never had a problem with the starter, alternator, ignition coils or the regulator.

Why also? Same type of dynamo, ignition coils and regulators were used in millions of VWs (beetles and buses) and ran for hundreds of thousands of kilometers without any problems.

But I often had to help Laverdisti who had problems with these parts.

The cause was always wrong treatment.

Regulator:
- Rubber storage is missing or defective
- no ground connection
- Cable connections broken off / vibrated because solder was used or the cable feed was too tight.
- Connections to the battery are rotten

Ignition coils:
- Cable connections broken off / vibrated because solder was used.
- The fastening clamps of the ignition coil broken, because the two original aditional reinforcement plates were not used.

Battery destroyed:
Battery not attached and / or no cushioning rubber pad under the battery

Often, cable terminals are crimped incorrectly or even soldered - it has to break!
No ferrules on the cable ends in the fuse box is a "no go".

In the digital world you would say "problem in front of screen". ;-)

Thomas aus LAU
 
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Thomas aus LAU said:
Thanks - corrected.

Thomas aus LAU
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Apart from some middle east export GTLs of course. :rolleyes:

Paul

PS. Thomas, were you with a group who stopped off whilst we were eating on our way to Breganze in July 2019? Somewhere in the mountains. There were 4 of us. 1970 SF and Atlas from Belgium, my SF2 and Corinnes Triumph.
 
I have a friend working on a Lav 750 that's touring Tasmania. Its generator has died (windings open circuit) and the guy wants a quick fix because he's in the middle of a trip. Is the Bosch generator readily available? It's just a belt-driven DC generator so I'm wondering if it was in common use in cars of the period, like VW. Maybe he can scrounge one from a car wrecker somewhere. Is there a Bosch part number that I could search?

This question may have been asked before, but I couldn't find anything with the search function.
 
Dellortoman said:
It's just a belt-driven DC generator so I'm wondering if it was in common use in cars of the period, like VW. Maybe he can scrounge one from a car wrecker somewhere.
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Here are some examples: Dynamos on ebay

The alternators for cars are more powerful at 30 A instead of our 11 A. You have to pay attention to the correct direction of rotation.

I have already used these alternators several times as a replacement for old tractors (Fendt).

Thomas aus LAU
 
Paul Marx said:
PS. Thomas, were you with a group who stopped off whilst we were eating on our way to Breganze in July 2019? Somewhere in the mountains. There were 4 of us. 1970 SF and Atlas from Belgium, my SF2 and Corinnes Triumph.
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Yeah I think we met us in 2019.

We traveled with an 69 Eagle, an Jota, a 3C, an SF1, an SF (0) and a 650 Zane.

I think you were the 2 older (sorry) motorcyclists and a female motorcyclist from France or Belgium.
We stopped there because we saw Laverdas in the parking lot. As far as I can remember, the woman did not have a Laverda.

I think it was somewhere east of Trento in the mountains.

Crazy how time flies....

Thomas aus LAU
 
Thanks to you all for your advice.....I'll pass it on to Tim and hopefully it'll help him get mobile again. Appreciate it.
Aldo
 
Am following this thread with interest. on Dragging the GTL from the back of the shed, where it’s been for decades, I find the regulator hanging on it’s wires beneath the frame where it is supposed to sit. I do remember that the red charging light was flickering and not going out when revved before layup. So I suspect I have some learning to do.
 
Thomas aus LAU said:
Yeah I think we met us in 2019.

We traveled with an 69 Eagle, an Jota, a 3C, an SF1, an SF (0) and a 650 Zane.

I think you were the 2 older (sorry) motorcyclists and a female motorcyclist from France or Belgium.
We stopped there because we saw Laverdas in the parking lot. As far as I can remember, the woman did not have a Laverda.

I think it was somewhere east of Trento in the mountains.

Crazy how time flies....

Thomas aus LAU
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Yes, that was us.
2 from Belgium, 2 from France. The lady is my wife Corinne who was with her Triumph Street Twin. 40 000 km in 4 years with her Triumph.
( following me on my Laverda )
The oldest was Jean-Claude who was 70 and still did Breganze to Liège in Belgium in one go on his 70 SF on the way back because his father was unwell.


Paul
 
Allways che
Paul Marx said:
Yes, that was us.
2 from Belgium, 2 from France. The lady is my wife Corinne who was with her Triumph Street Twin. 40 000 km in 4 years with her Triumph.
( following me on my Laverda )
The oldest was Jean-Claude who was 70 and still did Breganze to Liège in Belgium in one go on his 70 SF on the way back because his father was unwell.
Paul
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Forgot the orange SF(72) and the Buell M2 in our group.
Mathias found a picture he had made.

Thomas aus LAU
 

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I never had problems with my Dynamo but that damn regular I had to replace 2 or 3 times as I added Hi-Power head lights and fog lamps - I did a lot of long distant night riding in Northern Ontario.

Always wanted to change out to an alternator considering my riding environment but I did make due for some 45 years with that dynamo ;o)
It would NOT keep my battery fully charged after a night of riding with all my lights on. Just had to live with it !

Day light long cruising with head lamp on low beam - No issues.

AT night: Head Light on Halogen Hi-Beam 65 watts - 2 LED Fog Lamps at 35 watts - That's 100 watts - Somewhat over powers a 13.8 Volt, 30 Amp, 65 Watt 750SF Dynamo (Think I'm close to specs - Correct me if I'm wrong) and Regulator ;o)
 
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