1986 Yamaha Bravo LT (Long Track) Service and Repair Manual
On a 1986 Bravo LT the code you are matching is BR250TK, and the manual is Yamaha LIT-12618-BR-01.
Yamaha wrote this one volume to serve a very long production story: model years 1984 through 2000, then 2007 through 2011, taking in the standard Bravo and the Bravo T along with the long-track machine. For an owner that breadth means a mid-eighties sled is covered with the same detail as the rest, and specifications for adjacent years sit close at hand.
The book is arranged for repair work rather than reading. Measurement limits and torque figures come before the procedures they belong to, engine and power train sections follow the order of disassembly, chassis and suspension adjustment is set out step by step, and the electrical chapter pairs fault-finding charts with wiring diagrams.