I have a bunch of early 500 unit Triumphs and know a thing or 2 about them, The gooseneck frame and frame bracing and the tank issue is a topic in itself.
These have been languishing in storage and plan to make a few interesting projects out of them but plan to sell them to fund other projects.
5T speed twin, T100SC and other variants. There is a real authority associated with the VMCC who I need to contact as he is the guru on these before I proceed much further..(Some of mine are matching #s but most are orphan bits collected over the years)
So before I go off on a tangent, The distributor grew from some of the 6T preunits and on the 500 sprouts from a cast boss off the intake came with a toothed gear on the cams. I have worked with a number of people with these dizzies on early BSA unit motors (B40) several unit & preunit Triumphs and some Matchless use these as well.
My opinion??? The Dizzies on these are rubbish. Never had any luck with successful running and tuning. Im sure someone will regale with lurid tales of wild success, but I never had any. IMHO there is too much slop in the gears and too little adjustment and range in the Dizzies. On Garys Bikini T100SS, We could get it to start and idle, but any revs its a dog, Tune for mid and upper RPM and you cant start the bugger.
So, for those who want originality appearance the advice has been to fit a kit like yours. Tobin had good success with his Matchy G12 after doing the digital conversion, So did Hal.
As the other poster noted, Its a car type distributor so only one coil needed. Now,, I wont run one, I have enough parts I use the later timing covers and cams and run the EI inside the Points housing driven off the Exh cam.
## FUN FACT,, Its not super easy, but it IS possible to swap cams on a unit 500 without splitting the cases.
If you want the parts to convert, I think I have enough left down in storage.
This page and sub-pages off of it has a wealth of info on the early unit twins. Not just the 350s so dont let the link title fool you...
See:
https://www.triumph-tiger-90.com/index.shtmlOn mine, since most is just orphan parts or already modified (Some are old race machines) there is not a lot of value in restoring them, However flat track and desert sled styled bikes are huge right now in the US so my plan is to largely customize mine, right now theres 5 projects, and plan is 3 rigids and 2 swing arms.
Ill include a pix of a Gary Nixon tribute bike of what mine will evolve into...
(I do have a T100SC I could part with if someone wants to take it on, good buddy price? These are super rare but very obscure)