Are sure that the pipe and jetting changes are part of the problem? from looking at the other thread, the two may be unrelated. It doesn't make sense that your bike ran good after the change, then after attempting a jump start with the booster the problem started.
Buy the Yamaha service manual, (I have it on DVD and a real book)
get the multi electrical tester ( Radio Shack) and work your way through the system, probably the only way you are going to get to the root of the matter.
Are you friendly with the local dealer? I would try to pick one of the mechanics brains if they will help. ( I personally dont use the dealer mechanics, but they do know the bikes)
Is it possible that, when you re-jetted the carbs that some debris was floating around in there and finally made its way into a bad place? ( I am inclined to think this is not it)
Have you checked the battery that it is still good? I am new to the Vstar myself, but I use to have a 81 GPz1100, it was fuel injected and therefore had something of a computer. If the battery could not deliver a full 12 volts it would not run right. I would charge it up, it would crank up and run, however because the battery was weak and old it would run down and start misfiring, no power and eventually left me stranded.
I would have that battery checked, and start working through the ignition system to make sure it is all working properly.
Without hearing or seeing the bike, that is the route I would take.
Best to you.
I see that you did flush the tank. My bad for speedreading.
“Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.”
Last edited by Vstarlindy; 05-24-2014 at 08:37 PM.