Hi Dan, if you are going to trial the bike, it’s very simple, you only need the following
 
	black with red band from alternator to the cdi unit
 
	The two wires from the pick up to the cdi unit, green and a blue/yellow from memory 
	Black and green wire from cdi to ignition coil
 
	Black/white and green from cdi to stop switch
 
	if you are re powder coating frame I found it better to earth the cdi unit to the engine rather than the frame as the grounding is only for the engine, the green wire from cdi, doing this avoids any bad ground due to the powder coating
 
	the white red is the neutral switch again not needed if you trialing the bike
 
	colin at Tyoffroad has an updated cdi unit which works very well, this is a link to his site for these, don’t be alarmed at the price when they are back in stock they are not this price, he does get them in stock quite regular, they also come with very easy to follow instructions, by the way I have no link to Colin’s business just used his products in the past and found them very good
 
	https://www.tyoffroad.co.uk/store/p283/CDI_UNIT_FOR_HONDA_TLR200_TLR250_RTL250_(REF.H079).html
 
	hope this sort of helps
 
	Gary