RD400 Dyna ignition modification

[220 Ohms]

Dyna used to sell an ignition (points replacement) for the RD400 but stopped as it would also allow the bike to run backwards, which I guess created a situation they didn't want to be liable for.
I'm looking at adapting a Dyna S system from another bike which is a fairly straight forward process but am wondering if there was any modification that could be made to stop it from running backwards. Advice only goes as far as getting the timing set spot on 2mm BTDC and making sure to kick it right through when starting and checking the tach for a reading to indicate it is running the right way.
I found one discussion where someone had been advised they could add another magnet on the rotor just behind the existing one (as far as how it triggers is concerned so that if it did kick backwards the added magnet would trigger first and being too far advanced for the low speed the engine wouldn't fire) but this seems like it could cause other problems, anyone got any ideas?

[Grumph]

Just fit the dyna. The chances of your ever having it start and run backwards are slim at best.

[husaberg]

What Grumph said, it will not harm the engine running backwards, just the owners underpants.If it ever happens.
I had a soft tuned trail bike that used to do it on occasion. No harm ever occurred
Ignition wise There is little else available for the Rd400 anyway, unless you are going to race it.
From memory the points cranked RD400 accepts any of the TZ spec ignitions of that era, but not the CDI version.

PS Coffin tanked RD400's are f-ing epic
Post a pic.

[220 Ohms]

Thanks for the replies guys, I'll get the Dyna S on.
Still in the middle of a big rebuild, was a bit of a basket case when I got it so it has been completely stripped.
Full engine rebuild, expansion chambers, EU spec wire wheels blah blah blah
getting a bit carried away I think, just bought some new decals for the switchblocks :)

Top pic was when I got it 2ish years ago
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[F5 Dave]

Ahh bollocks, won't run backwards unless the timing is stupid far out.

Cool bike. I'm watching a couple I know of. Need spare money and the right moment to pounce.