Brrrr. Cold start issue

[Volvi]

never have cold start probs. always fires up first time, recently stood for over 2 mths, ezy start. Maybe coz I have only been using BP Ultimate for the last 10 yrs on the bike. supposedly keeps injectors clean due to additive in Ult. ps. battery is always on trickle charge. My CBR is a nightmare to start, if standing longer then 3 days. 25yo bike reckon the carby has never been cleaned in its life, so looking to do that one day.