Top 3 things: carb clean on v4 Honda is a job.... slow jet/choke/idle circuit tuff to get clean.... Springs, main jets, emulsion tubes, needles Fronts diff from Rears, if wrong ya gotta pull em again, all ya need is float bowl o-ring and maybe mix screw o-rings to clean. mix screw very easy to get at even on bike. I got lucky just cleaned mine on bike w/Yam carb cleaner worked fine. Electronic dash... even has its own service manual from Honda. Most important is camshaft lobes / rocker arms. most all Honda v4 of this time period had cam probs scoring pitting I pull valve covers before offer $$ many bulletins and there is a tool and spec for lash for each and every engine/model. If cam bad noise slowly keeps rising w/rpms. 4 cams 8 double armed rockers. Heads usually OK. Cam chain tensioner if bad will make noise up to 3k then get a little quieter. I worked on these all thru 80's 90's. I have 2 v65's and a full extra set of near perfect heads cams rockers valves cam ch tensioners sitting next to them. Battery spark plugs good oil + filter blah blah..... I would try to get running even with start fluid and hold throttle open to hear engine run for a little bit.
TIME TO STRETCH THE RODS
ROLL THAT BEAUTIFUL BEAN FOOTAGE