my piuma 250 also feels heavy but with footrests lowered and yokes modified to parallel it is now really nice to ride and the piuma was the lightest one made.its mostly the engine and hubs that make it heavy.
i remember someone else having this problem but cant remember the solution. jack at john lee motorcycles sorted it for him . give them a call and explain.jack used to be mechanic for adam raga and was aware of this problem.
the 199b had a 4mm bracket used fixed onto the bottom of the seat and doubled up as the seat mounting brkts .most of us back in the day moved the footrests back about one inch.
i had both bikes but felt the 199a was the better one.
on the ty175 the damage was caused by the chain tensioner spring becoming weak and allowing the chain to come off and cause this damage a common problem on that bike
no problem steve glad to help just looking at the project and thought it might be a good idea to machine some weight off that flywheel and make the bike more responsive .up to you of course .my majesty is highly modified thats why i had the hose left over. nice job though keep it up.
my 240 fantic rebuild is nearing completion but i,m undecided what size rear wheel and gearbox sprockets to fit any suggestions would be very helpful before i end up buying the wrong sizes .many thanks.