Does it start when you're not sat on it? I had the same problem with a 93 fireblade it would start when I wasn't sat on it or the seat removed but with seat on it was no go it turned out to be a break in 1 of the wires to the cdi that when pressure was on it it would break the connection it was a pain in the arse to find anyway just a possibility
Sounds like you have disturbed battery connection / wiring in that area when you fitted new seat. Was everything OK before you fitted seat? was it in regular use? Is it charging OK? Is the battery u/s.?
So have you tried it with two batteries, why have you put a new battery on? Do both batteries do same thing? Which battery was on when you took it for a short ride? Did it start ok after you put the seat on. how long was your ride? I'm confused, for us to narrow down what it might be we need a list of what you did and when. was it running OK before you put the seat on etc.
It is very difficult trying to help unless we have all the facts.
But there are lots of clever peeps on here, so it will get sorted.lol.
I did drop a battery terminal bolt through a slot by the battery housing. So it is killing me is it somewhere where it could cause a problem. Did it fall out on a little test ride? Like chasing ghosts potentially. I asked before do you have any gauges / the odometer or anything come on with the key in run mode without starting? The instrument panel has light but nothing else.
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