Just linked from "forum desmodromico" : how to machine stock heads to place a second spark plug!
Just get drunk watching pics!!!

no links

With dual spark conversions you really have to know what you`re doing. If the timing is not set exact you can ruin your engine pretty fast.

They have modified many 900cc Supersport(91-97) syl. heads for 2 spark plugs, but that is easier in that air/oil cooleed engine... Some of them used Harley coils.

main site link is here for those interested written English also available

http://www.desmodromico.com/homepage.htm

here's the link! It didn't worked yesterday
The write about 350, 650 750 and 900 heads machined to place a second plug!
I have not enough time to read the entire topic
So busy by now!

Unfortunately, it can't be read by not registered users.
I tried to register to that forum, but seems the administrator has to authorize me before I can read that forum.
Ciao

This is the work made by a guy from Torino



This is the site of another one from Milano

And this is from an american site...

Very interesting.
On a 900 engine, he has reached 92hp, from 78hp of the stock engine.
If someone needs the translation...
Ciao

So he has raised the compression to 13:1 with a new set of pistons,ported the head with new valves,added Benzene to the fuel as well as the additional spark
not your average street mod

More compression=more power, simple. But lifetime of engine will be much lower. Its wiser to make more CC*s, than only compression...

But Ducapaso is very good in marketing, as he put some pipe there(upside down, like newer Ducati forks... ) with stamped "made in Italy"... Are you working with marketing ???

I wonder what power increase you could have by a mild compression boost, say 10:1 and the port and polish with the extra spark. Adding the second plug seems to be fairly easy and I do have a spare set of heads and cylinders,hmmmmm another project to put on the todo list, if I ever get through the honeydo list
Antti! your a genius

Dual spark is not bad idea at all, as also factory have gone that way.... Its good for fuel burning surely. Its much easier to do to air/oil cooleed engines, than to water cooleed ones. If do such to water engine, then have to be VERY sure about water/oil lines in sylinder head. Surely that can be done also, but i wouldnt do it to my OWN "water heads". As i told earlier, many guys have done it to air /oil cooleed 900cc SS engines with quite good results, but its not only way to get more power.... There is also big bore kits, etc... ALL depends, HOW MUCH MONEY u are ready to invest such old bike, as Pasos are... I think that allways... With enough money u can also take flight to space...

What is the power difference between 2V 1000 & 1000DS?
I think dual spark is mainly for emissions, not power,
but what do I know....

dual spark is strictly a flame propagation thing, related to higher octane fuels required for higher compression ratios.don't think anyone wants to go there ...again
that is why he adds green benzene in the 13:1 version of his mod
I don't actually think dual spark would add anything to a normal compression engine but it would sure be cool