Congrats on your "priceless" acquisition. No bike in India including the comet can beat the "Fun to Ride" factor that this bike has. IMO, the Yezdi 350 and the Fury came close but again RD is in a different league all together. Some advise/suggestion from an ex-RD owner(I regret having succumbed to the wish of my folks to sell it but anyways I sold it to a close friend of mine who takes very good care of the bike and allows me to ride it once in a while
). Here goes..
Try and restore the bike to its originality as much as you can. This will require a lot of patience and gujari-hunting but it is worth every bit of money and time. The joy of finding a spare that you need is like finding a treasure. Think twice, thrice or even ten times before replacing an original part with a substitute.... if you search, you will find the spare. There are some RD350 Yahoo groups which will be of help.
I suggest you continue for a few more days with the bike's current mechanic and then find a different mech if the current one is not good.
Good RD Mechanics in Bangalore are:
Torque Center(Zak) in Vijayanagar. Let me know and I can introduce you to him.
Powercrest(Murugesh) in Vyalikaval below the Sankey Road Bridge.
DTW(Shekar) in Shantinagar
Joe on Queens Road
IMO, Chinoy is over-hyped and does not fit into the above league. When it comes to RD, everyone is expensive.... so get used to it. Like cool_sizzlers said, you have to be your bike's mechanic and know everything about the bike.
Don't worry about your silencers, they are original High Torque. Don't give up your point set for a CDI ignition unless you get the original CDI ignition that came with the bike around 1988.
Not to discourage you, but there are a lot of things on your bike that are not original(this is normal and is due to lack of spares)....you have RX100 indicators, Yezdi headlamp unit, switches, yolk and levers are from various bikes. Rear mat like Mud-flap is missing but very important for originality... should be very easy to find a new one. Get orginal seat cover and beeding.... Rao seats in Shivajinagar can do this for you.
Try and get the original Carrier and original high-torque rd's handlebars. Hunt for original indicators(I got a set of 4 indicators from 3 different gujari shops over a period of 4 weeks). FYI, the RD175 and the RD350 share a lot of parts like Engine-kill switch, yolks, levers, mirrors, tail-lamp assembly etc.
Some spares are available at:
MCC in JC Road, Bangalore.
Anand Automobiles on GP Road, Chennai.
Gujaris in all cities.
Sorry for such a long post but this I get mesmerised when I hear the word RD and more so when I hear the sound of its exhaust.....pure music.