We cleaned these carburettors from a Yamaha RD350B for a customer restoration. Despite being stood for a long time, the bike was in excellent condition. The paintwork is very good however the air box and carburettors had a few problems
As with any aluminium part that has been left standing with some moisture or water penetration a very hard white material forms, nobody seems to know precisely what the material is but it is very hard and difficult to remove with anything other than some strong chemicals that have safety and environmental issues
The results are very impressive considering they are over 40 years old. We recommend advanced treatment such as ultrasonic cleaning is undertaken to remove all traces of the original corrosion and blast media
Before and after Vapour Blasting :-
