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#Post#: 2890--------------------------------------------------
Dynastart- relay or no relay
By: Rob vW Date: November 1, 2020, 6:59 am
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I would like to fit a dynastart instead of the standard dynamo,
having recently experienced knee problems.
If I fit one with the correct regulator for a dynastart, do I
still need to fit a starter relay?
Or, can I fit the dynastart and use the standard dynamo
regulator in conjunction with a starter relay?
#Post#: 2891--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: November 1, 2020, 5:24 pm
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I don't have one, but my understanding is that you need the
special regulator, and also a smaller (edit) pulley to suit the
Dynastart. TLM had one on eBay earlier this week
#Post#: 2892--------------------------------------------------
Re: Dynastart- relay or no relay
By: Rob vW Date: November 2, 2020, 1:28 am
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I was wondering when you would respond Banquo!
Some of the posts I have seen suggest that you need the special
regulator for the dynastart. However other posts suggest you can
use the standard militare regulator in conjunction with a relay.
Obviously if the latter is possible it will save me a bit of
money.
Also, regarding the pulley, other posts suggest a smaller one
for the dynastart. This is to get it spinning faster to generate
enough power for charging the battery.
My understanding is that the standard pulley is 90mm diameter.
The dynastart pulley is 70mm diameter. Getting a pulley sorted
is not a problem at present (until lockdown begins on Thursday).
#Post#: 2893--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: November 2, 2020, 4:12 am
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Yes, I've been a bit tardy of late. There's so little traffic on
here I don't check every day.
I'm sorry, but I don't have any knowledge of how to wire with
relay and stock regulator, but if others have practical
experience of that, then as you say, it would be a far cheaper
solution.
Smaller pully makes sense of course. I suspect my memory, as is
so often the case these days, has let me down! :(
#Post#: 2894--------------------------------------------------
Re: Dynastart- relay or no relay
By: Rob vW Date: November 2, 2020, 5:27 am
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I think I may have answered my own question by translating some
of the Italian on a diagram of the relay & dynastart wiring.
The suggestion is that if you want to use a dynastart with the
standard regulator for the Militare version, you need a relay.
The Lucas SRB 325 was specified.
The regulator for the Civile already has "protection" or is
already suitably rated to not need a relay.
I had to search round various posts regarding the pulley.
Modern pulleys are available with suitable taper lock bushes so
that mounting on different spindles is not a problem. I can
source this and the shorter drive belt quite cheaply.
It looks like I'm going to be busy!
#Post#: 2895--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: November 4, 2020, 3:58 am
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Well done Rob.
It's possible the Civile regulator is different?
A lot of the Civile came with Dynastart as standard, so maybe
they used the same reg. for all?
I'm afraid it's well outside my scope of experience.
Would be good if you could post up details of the pulley. I know
others have had problems sourcing one, and some are living with
the stock one, and only charging at high rpm.
Good luck, and hope it all goes well
#Post#: 2896--------------------------------------------------
Re: Dynastart pulley
By: Rob vW Date: November 5, 2020, 3:10 am
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The dynastart pulley is dead easy to source. There is no need
to modify the existing pulley and this is why I personally think
it is easier to restore old vehicles today. And I cannot take
credit for all of this because the answers were posted elsewhere
on this forum.
The dynastart shaft is 17mm in diameter, whereas the original
dynamo shaft is 15mm.
If you search online for a "taper lock bush", this will take you
to any one of several companies supplying parts for power
transmission. A taper lock bush is a part designed to allow any
size of pulley, including multi belt pulleys, to a shaft. I did
a search on one company website for a taper lock bush for a 17mm
shaft and on the same company for a 71mm diameter pulley and
SPZ637 v belt. All these items have been mentioned on posts on
this forum already. And don't be afraid to use the cast iron
pulley. These bikes weigh a ton already so a few more pounds
doesn't make any difference.
The dynastart itself is no more than a dynamo with an extra set
of components to turn it into a motor when required.
Again, all has been posted on this forum before. However, you
do not need the special regulator for the dynastart. By wiring
in a Lucas SRB325 solenoid/relay to the standard militare
regulator you can operate a dynastart. You just have to follow
the instructions (translate from Italian) previously posted.
Mounting the Lucas relay is a challenge as it is quite large,
but I will hide mine at the back of a side panel box to shorten
the main cable runs. The starter button will be on the right
handlebar with power taken from the fuseboard and the 2nd wire
to a terminal on the relay.
This is definitely not rocket science. It just takes patience
and time.
What with a halogen headlight, headlight relays, horn relay,
indicators, LED tail/stop light and electric start, this bike is
definitely not standard!
#Post#: 2897--------------------------------------------------
Re: Dynastart- relay or no relay
By: banquo Date: November 5, 2020, 4:23 am
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Aye, everything's easy when you know how!
I didn't remember that all this had been covered before, but not
remembering things is increasingly normal these days... ::)
However, I'm delighted to hear that you found most of what you
needed on here already, proving that although we might not have
much traffic in these days of social media, a forum is far
better for retaining and locating important information than
Facebook will ever be.
Hope it all goes well for you.
#Post#: 2898--------------------------------------------------
Re: Dynamit-relais ou pas de relais
By: monohorizontal Date: November 5, 2020, 4:48 pm
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salut j'ai un régulateur avec relais intégré sur mon falcone
bleu avec dynastar et un régulateur électronic seul avec un
relais extérieur sur ma falcone sport rouge c'est comme ont veut
et j'achète les courroies chez conrad ;)
HTML https://guzzi-nuovo-falcone.forumactif.com/t55-regulateur-electronique
hi I have a regulator with built-in relay on my blue falcone
with dynastart and an electronic regulator alone with an outside
relay on my red sport falcone. It's like have wanted and I buy
the belts at conrad
#Post#: 2899--------------------------------------------------
Re: Dynastart- relay or no relay
By: stevelindsey Date: February 14, 2021, 7:47 am
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I know this is an old thread, but it was very useful to me in
helping getting my old tractor electric starting. Here is what
I ended up doing. I bought a HC-Cargo 110061 dynastarter. The
drive belt is a SPZ type, 10mm x 645mm. Now the interesting
subject of the pulley. It is suggested that the correct size is
71mm. I tried a 71mm pulley. The starter worked but quite high
revs were required for the charge light to go out (over 30mph on
the road). I have retained the original regulator which could
have something to do with it. I ended up with a 60mm pulley.
This gives better torque for the starter and the charge light
extinguishes just above tickover. I was a little worried about
overrevving the dynastarter but I figure if the charge light
goes out at the correct revs all should be well. I got my
pulley from Bearing Shop UK (APZ060/1). They will also machine
it for you. You need a 17mm bore and a 4mm keyway. £32.99 all
in. As supplied, I found I could get the dynastarter shaft nut
on but not the lockwasher. There is always loktite of course
but I prefer belt and braces. I dont have a lathe but using a
woodworking router at low speed with a sharp bit, I reduced the
pulley boss by about 4mm to give room for the lockwasher. The
original pulley had holes for a holding tool but I found I could
tighten the nut well by using a strap wrench to hold it. I saw
the suggestion of using a taper lock pulley. These are good
devices (I used them extensively in a factory years ago) and I
did try this solution. However, I found there was not enough
shaft length on the dynostarter for the taperlock to grip. Yes,
it would have worked but only gripping a short length of shaft.
I would not trust it. On the electrical side, I used the Lucas
SRB325 solenoid and a cheap handlebar push switch both of which
worked well. I used car battery lead for the heavy solenoid
connections and added a similarly heavy earth lead. I did have
a few problems which might have been to do with buying the
dynastarter and leaving it on the shelf for 18 months before
getting round to the job. First off, it would not motor. Ended
up spinning it round on the kickstart with the starter button
pressed (decompressor in of course) and eventually it got the
idea. Similarly it would not charge but that was not unexpected
and was solved by flashing the unit in the time honoured
fashion. All in all a successful exercise and the starter works
well, hot or cold.
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