Motorcycle Repair: timing 1968 ym1 yamaha, yamaha, ym1 ignition timing

Question
I've got a 1612 mile 305 YM1 and I believe the timing was 1.8mm before TDC can you confirm. Of course I can't find a service manual for a bike this old and I've forgotten the specs for this bike 'cause I'm older!  
Thanks          TD

Answer
Hello Taylor,

Although this is way before my time, I did some digging and found a lead.
It's 19mm +-1 (18-20mm).
Further more, the technician who provided the info, told me that this bike works best if set to 19-20mm.

I hope I was helpful.

Best Regards,
Lazaros.