Ignition timing problem

Questions and answers about Mobylette in English
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MobyJet
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Ignition timing problem

Ongelezen bericht door MobyJet » 30 jun 2012, 16:01

Ik kreeg een mailtje.. Heb momenteel even geen tijd om te beantwoorden, dus hopelijk wil iemand anders dat op zich nemen.
Heb natuurlijk verzocht zich aan te melden om het antwoord te lezen en verdere vragen te stellen..

We gaan internationaal!!

Hello Mobyletteforum!

Got a problem! I have a Mobylette AV 44 1964 with an AV 7 engine (the older type with a rounded top) nr 4 563 047. It has a Gurtner AR 8-7-525 carburetter and a Novi type M.A. nr G 001618 LS - 6V 18 W flywheel magneto with an external high tension coil.It is of the Dimoby automatic clutch-type. It has no Variator. The moped was intended for the Swedish market and is boght from an authorised Swedish dealer. As Mobylettes were quite rare in Sweden, I have´nt succeeded in my efforts to find an accurate manual. I need to know the correct timing. Different sources states different timings: 2, 2.8, and 3 mm BTDC. Which is the correct one? The trial and error method involves quite some work, so I would find it more easy to at least get a hint on a correct starting point.

Eagerly waiting for a response and best regards

Kjell Hellström

Stockholm/Tyresö
Sweden

GROENEKAN
Berichten: 2004
Lid geworden op: 05 jan 2011, 12:32
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Re: Ignition timing problem

Ongelezen bericht door GROENEKAN » 30 jun 2012, 19:34

Dear Kjell,

As far as I know the best timing will be 2.8 mm before BTDC.

Good luck and all the best, Joop

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Harrie
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Re: Ignition timing problem

Ongelezen bericht door Harrie » 01 jul 2012, 13:43

Hello Kjell,

End of 2011 we had some information exchange about the colour chaudron.
Well, the timing of most models equipped with the AV 7 after 1962 is 2.5 mm.
2.8 is just for the oldies of the fifties and early sixties. (correction!)
Kind regards,

Henk van Kessel (Harrie on this forum).

ruudk
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Locatie: Lellens (prov. Groningen)

Re: Ignition timing problem

Ongelezen bericht door ruudk » 01 jul 2012, 19:52

2.8 is just for the oldies of the fifties and early fifties.
It is completely obvious that Harrie meant the fifties and early sixties :lol:
Kind Regards,
Ruud

GROENEKAN
Berichten: 2004
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Re: Ignition timing problem

Ongelezen bericht door GROENEKAN » 01 jul 2012, 20:19

You are a sharp reader, Ruud ! Gr. Joop

GROENEKAN
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Re: Ignition timing problem

Ongelezen bericht door GROENEKAN » 02 jul 2012, 07:38

Hoi Jet,

Mail jij reactie Harrie naar Kjell ?

Dank en groet,

Joop

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Franky
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Re: Ignition timing problem

Ongelezen bericht door Franky » 02 jul 2012, 08:59

GROENEKAN schreef:You are a sharp reader, Ruud ! Gr. Joop
And now the monkey comes out of the sleeve :lol: :lol:

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MobyJet
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Lid geworden op: 04 feb 2010, 19:22
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Re: Ignition timing problem

Ongelezen bericht door MobyJet » 18 jul 2012, 18:57

GROENEKAN schreef:Hoi Jet,

Mail jij reactie Harrie naar Kjell ?

Dank en groet,

Joop
Ik had hem meteen al een linkje teruggemaild dat ik het zou posten en dat daar het antwoord zou komen.
(En natuurlijk dat ie zich gewoon even moest aanmelden ;)).

Kjell
Berichten: 6
Lid geworden op: 22 dec 2011, 22:15

Re: Ignition timing problem

Ongelezen bericht door Kjell » 31 jul 2012, 11:09

Thank you all for your hints concerning my timing problem. I have now tried both 2.8 mm and 2.5 mm before TDC, but without any significant difference in performance. In Sweden the maximum output of mopeds was restricted to 0.8 hp until 1961, when an output of 1.0 hp was allowed, so maybe my Moby is performing according to authority regulations.
Regards
Kjell

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Harrie
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Lid geworden op: 05 apr 2010, 20:40
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Re: Ignition timing problem

Ongelezen bericht door Harrie » 31 jul 2012, 15:41

Hello Kjell,
What is the top speed of this mobylette?
Kind regards,
Henk

Kjell
Berichten: 6
Lid geworden op: 22 dec 2011, 22:15

Re: Ignition timing problem

Ongelezen bericht door Kjell » 31 jul 2012, 22:01

Hi Henk!

No veteran moped in Sweden was allowed to exceed 30 kph. Top speed of my Moby is about 25 kph according to my speedometer (new old stock) but I use 19" (23") x 2, 25" tires instead of the original 19" (23") x 2" tires. The speedometer gearbox is a Huret 1:1,8 (23"). Think it would at least top a bit more close to 30 kph ...
Regards
Kjell

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