looks like suzuki gt250 to me. the 250a was slightly different to the ramairs. the ramairs have a green wire joined to a green/white wire just before the big plug. off the top of my head, red wire to rectifier, white wire to points, black wire to points, yellow/green to rectifier and blue to neutral light switch. unfortunately i don't have one in front of me, so just going off my terrible memory
cheers, dd.
GTS250 road registered. TS250 engine, Ramair frame.
GT250 big bang road registered. Both pistons fire the same time. USD forks.
GT285 road registered. Overbored - 58mm and TS125 +2 pistons fitted.
GT10 road registered. '65 T10 engine, GT250 frame.