HI i recently purchased a 75 cb 400f it had been in storage for 10 years, when i got it i gave it a service ie. oil change filter ,plugs air filter gave the carbs a good blast of carb cleaner a new battery and she fired up when i kicked her over but she sounded like a v twin ducati not good any ideas . no smoke at all when she starts but just wont fire on all 4 there is a spark on all plugs can anyone help or give advice many thanks