A10 12volt no start

[Catz]

As per instructions from Muskrat i've posted up over here,
i've put a 12v ignition by Boyer Bransden bought from SRM and just can't get the bike to fire up.
It nearly wants to, has a few backfires and that's it. New Yuasa 12 volt battery, getting a spark at the plugs, set it up as per SRM instructions. There's an on/off switch when at one stage today i turned it on and it backfired without kicking over. Everything is new apart from the dynamo, could it be that? No air filter, took it out as i thought it might be restricting air flow. Jets are standard for the 1960 A10 with Monobloc 389, also all clean. Petrol comes out when tickled.
I'm at my wits end with it though i know it can't be much needed to fire up. Any help is much appreciated.

[Rex]

The obvious first question would be, did it run before you fitted the BB unit?

[Catz]

Yes mate, ran good.

[Greybeard]

I know nothing about electronic ignition but.... your symptoms sound like swapped HT/firing positions.

[Catz]

I'll go and swap the leads round but it shouldn't make any difference if it's a wasted spark set up should it?

[Greybeard]

I'll go and swap the leads round but it shouldn't make any difference if it's a wasted spark set up should it?

Well, that was why I prefaced my comment with "I know nothing about electronic ignition but."

[Catz]

I tell you what mate, you're my hero, it's only gone and fired up. Glory be. Thanks a lot. 

[Greybeard]

You have no idea how pleased that makes me! 👍

[Rex]

I tell you what mate, you're my hero, it's only gone and fired up. Glory be. Thanks a lot. 

Sounds like one of the plug lead/caps wasn't making good contact then, as they both fire together on a wasted spark system as you said.

[Catz]

Thanks for your reply, i'll check it out when i tidy it all up. Don't want to mess it up now.

[Bsareg]

GB the resident sparky !!🤔😀

[muskrat]

G'day Catz.
Yes depending on where the "pick ups" are when you turn the unit on it will give a spark.
Do you have a coil with two leads coming out? It should. The Boyer sparks both plugs at the same time so one side is "wasted".
I'm going with Re on this one.

Now I've said it a dozen times. The only real way to time them is with a strobe and degree wheel. A bit of a job but once it's set you can forget it for 50,000 miles or until you rebuild the motor.
Cheers

[Catz]

Now then Musky,
yes it has a coil with two leads coming from it.
I've left the degree wheel in place on the end of the crank and i've got an old strobe light in my cabinet and i'll give that a go ASAP.
I'll say it again, top forum with top people.

[bsa-bill]

Just a thought, I don't know anything about Boyer, but I fitted a Pazon to one of my bikes which I think could be similar, I removed the A/R unit and replaced it with a solid alloy gear as the electronic ignition takes care of the A/R bit itself

[Catz]

Just a thought, I don't know anything about Boyer, but I fitted a Pazon to one of my bikes which I think could be similar, I removed the A/R unit and replaced it with a solid alloy gear as the electronic ignition takes care of the A/R bit itself

Yes, that's the same as the BB.

Now onto the use of the strobe which i think i know what i'm doing but just need a bit of clarification as the SRM  instructions are not the best in my opinion.
Warm the engine up and set the tick over at 3000rpm, i've got no tacho so i'll just set it spinning fast, then point the strobe at the timing disc and pointer while adjusting the pick up plate until, according to SRM, the reading is at 33° BTDC for unleaded fuel.