The usual first question with hard starting is what kind of battery do ya have?
An old, wet cell battery could be low on acid, causing difficulty in starting.
New plugs would be better than sanded old plugs. Ya may have opened the gap a little too much.
Have the airfilters been cleaned?
AKA: Tim & 'The Adventure Cycle' VROC #24567, NEVROC, SteelCity VROC
"When life throws you curves,
Aim for the apex."