ive recently bought gsx 750 es, i have real trouble starting it off the key, the battery usually dies b4 it as started. once ive got it started, its gr8 and sounds n rides really nice. even after riding it several miles, when i turn it off, it wont start agen. the engine cranks over fast enough, but just wont start. so i av 2 result in jump starting it, which is an effort. has anybody got any ideas please?