Static ignition timing

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syrup head
Posts: 21
Joined: Wed Apr 24, 2013 1:52 am

Static ignition timing

Postby syrup head » Tue Jun 12, 2018 12:05 pm

I have a 1968 5 speed narrow case 250cc Scrambler and I cannot find any reference to the static ignition timing in the manual. Does anybody know how many degrees it should be? Thanks.

Eldert
Posts: 572
Joined: Sun Nov 01, 2009 3:23 pm
Location: Hazerswoude Rijndijk Netherlands

Re: Static ignition timing

Postby Eldert » Tue Jun 12, 2018 2:29 pm

what automatic advance unit do you have ?

the AA 367 B ( advances 18 degrees ) or the AA 359 ( advances 28 degrees )

Eldert

Bevel bob
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Location: Bromley Kent UK.

Re: Static ignition timing

Postby Bevel bob » Tue Jun 12, 2018 6:04 pm

I think the units only advance half those amounts but its doubled by the gearing?.

Eldert
Posts: 572
Joined: Sun Nov 01, 2009 3:23 pm
Location: Hazerswoude Rijndijk Netherlands

Re: Static ignition timing

Postby Eldert » Tue Jun 12, 2018 8:43 pm

Bevel bob wrote:I think the units only advance half those amounts but its doubled by the gearing?.


so what would be the crankshaft degrees advance then ?

Bevel bob
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Location: Bromley Kent UK.

Re: Static ignition timing

Postby Bevel bob » Tue Jun 12, 2018 8:51 pm

Just looking for clarification Eldert, btw I dont think the crankshaft advances at all,its all done by the advance unit.

Bevel bob
Posts: 773
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Static ignition timing

Postby Bevel bob » Tue Jun 12, 2018 10:13 pm

The advance and retard units have a code number on them, with a bike of this age anything could be in there and they vary a lot . If the bike has a non std ignition system this may dictate what advance and retard would be the best,and the easiest to live with. More information would help.I'm not even sure a 68 NC scrambler was made.Is it a Spanish made bike?. There are experts on this forum who will help .

ducwiz
Posts: 271
Joined: Tue May 22, 2012 12:52 pm
Location: near Frankfurt, Germany

Re: Static ignition timing

Postby ducwiz » Wed Jun 13, 2018 5:23 pm

You might find your engine no. in this booklet http://www.motoscrubs.com/Ducati_Electrics/Ign_Flywheel.htm. Possibly it helps tpo identify the bike.

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Bevel bob
Posts: 773
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Static ignition timing

Postby Bevel bob » Thu Jun 14, 2018 9:45 am

Its very likely this is a mototrans built bike, all could be different. Spill the beans.

syrup head
Posts: 21
Joined: Wed Apr 24, 2013 1:52 am

Re: Static ignition timing

Postby syrup head » Thu Jun 14, 2018 2:09 pm

It is an Italian narrow case from 1968, I know they were not supposed to make them but this is one, I have the original Italian log book to prove it.

Bevel bob
Posts: 773
Joined: Thu Apr 15, 2010 8:01 am
Location: Bromley Kent UK.

Re: Static ignition timing

Postby Bevel bob » Thu Jun 14, 2018 2:29 pm

Does it have a battery?. Does it have points/.


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