I have just brought a yamaha dt but it has no spark the wirings a mess any ideas what it could be?? 

Hi Luke, first thing is GO TO New members section and say Hi, it's normal to say hello before you ask  "how do I fix my bike " question. Second thing DON'T plaster your problem all over the site, folks get stroppy about repeat postings. Then do you have a manual for the bike? That is where you should start, if the wirings a mess then if you can repair it as best you can then look out for a spare one from EBAY or some such, until you've done that there's not much anyone can tell you about what's wrong as the fault might not even be the wiring but a mechanical fault masked by the wiring issue.

Bonnie bike ,   elimination process,   diagram & meter is a must,,,

Edited July 29, 201510 yr by blackhat250