just found myself in a similar predicament, fitted a 14 series Yuasa about 4 weeks ago - all has been good until this evening,
left work at 5 went to start the bike and it was only turning over briefly before dying
luckily my mate was still at work so after an attempt to bump it, he drove to the local garage for a set of jump leads,
started straight away from his landrover
so got off up the M40 to home, got to junction 10 came off the slip road and was just getting to the roundabout when all the lights and engine just died
luckily i wasnt half way round the roundabout with a HGV up me butt
called AA man who arrived about 8.10pm, bike started 1st time when he put his portable battery on but my battery was only reading 12.6V & was slowly reducing as it was running - got down to 10.8V
Charging circuit ?? Alternator gone ?
so put bike on the trailer & eventually got home at about half 9, tired, cold, hungry & thoroughly piddled off
so have got the cage for the next 2 days & will order a new alternator & gasket & hopefully install it thursday if i can get it quickly.