Prprobably best to start with removing seat and fuel tank and doiing an inspection of wiring harness...all good, inspect each light socket for damage....include any added items on the harness.
If all that looks good...try temporarily unplugging horns...on Yamahas the horn is usually electrically "hot" and then runs to horn button where it is grounded.
A defect in the horn can short out and blow signal fuse.
SOURCE: my 2007 yamaha v star 650 keeps blowing the fuse
There seem to a 'live' wire (in the turn signal, brake light or horn circuit) touching the frame of the bike and thus the fuse blowing.
You will have to trace out the short-circuit.
You can start wth removing the connections to the turn signals thn fit the fuse and see if it still blows ....like wise remove the wire to the brake light and thn check if the fuse blows, same to the horn.
In short ..you can remove all the wires connections to these and thn fit the fuse and refit the wiring connections one by one ,where the fuse will blow after connecting the wire to say brake light thn the problem is at the brake light wiring ....likewise to the others ...onces you identify the circuit tht has the problem thn it will be easy to trace it and rectify it.
Hope this helps!
SOURCE: i have 2007 650 vstar
the mixture screw is under the the carby , back it off 1/4 of a turn this should stop it backfireing on deceloration
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