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Static ignition timing

Posted: Tue Jun 12, 2018 12:05 pm
by syrup head
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.

Re: Static ignition timing

Posted: Tue Jun 12, 2018 2:29 pm
by Eldert
what automatic advance unit do you have ?

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

Eldert

Re: Static ignition timing

Posted: Tue Jun 12, 2018 6:04 pm
by Bevel bob
I think the units only advance half those amounts but its doubled by the gearing?.

Re: Static ignition timing

Posted: Tue Jun 12, 2018 8:43 pm
by Eldert
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 ?

Re: Static ignition timing

Posted: Tue Jun 12, 2018 8:51 pm
by Bevel bob
Just looking for clarification Eldert, btw I dont think the crankshaft advances at all,its all done by the advance unit.

Re: Static ignition timing

Posted: Tue Jun 12, 2018 10:13 pm
by Bevel bob
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 .

Re: Static ignition timing

Posted: Wed Jun 13, 2018 5:23 pm
by ducwiz
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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Re: Static ignition timing

Posted: Thu Jun 14, 2018 9:45 am
by Bevel bob
Its very likely this is a mototrans built bike, all could be different. Spill the beans.

Re: Static ignition timing

Posted: Thu Jun 14, 2018 2:09 pm
by syrup head
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.

Re: Static ignition timing

Posted: Thu Jun 14, 2018 2:29 pm
by Bevel bob
Does it have a battery?. Does it have points/.