My 250cc came out of the showroom with rearsets fitted , ace handlebars and what looks like Higgspeed Expansion chambers,its only got just over 4000 on the clock and was last taxed in 1981 and up to present just stored away .
I have a couple of questions regarding what oil mix and ratios are required bearing in mind the expansion boxes and possibly rejetting it possibly had done at the time. Oh and one more thing ,what type and make of oil would be best recommended (Klotz r50) ??

I realise there are not many 250 Benellis with this spec around nowadays but any advice is gratefully recieved !