I (well my 86) recently have been blessed with Steve Sefsick's Shoodaben Engineering, two minute mod & carb jets, as well as a 7degree Performance Exhaust Cam Sprocket. I want to thank Colin Prior for wanting to install the jets and sprocket while at the national rally in Vermont. I guess she wasn't fast enough for Colin.
I have to say that it seems to have livened up the old girl a bit. She seems to run right along with a better low end. And hauling a guy my size around isn't easy on the motorcycle!
Of course I also have Steve's overflow tubes as insurance to prevent the possibility of hydro-lock. Although I had the overflow tubes on the carbs already, before Colin's COG National C10 modifications.
Whether you like to work on your own carbs or have Steve do the work. I feel the gains are well worth it. This would make a big difference if your bike runs a little rough lately (especially in the lower rpms). I understand that funds can be tight now a days. But if you can manage to scrape together the price for these mods, or better yet, for Steve to perform a carb service on your C10's carburetors. I bet you'll feel it's money well spent, once you ride your Concours afterwards. But don't ask me. Ask some of Steve's customers. I'm sure they'll chime in.
I know this sounds like a commercial. But I have no affiliation with Steve and Shoodaben Engineering other than being brothers in a great club known as Concours Owners Group. I really need to give a lot of the credit to Colin. Since Colin provided the parts and labor. I only provided the Concours. It was nice of Colin to do this for me. So after riding my C10 with these upgrades. I thought a shout out for these two guys was appropriate. Colin for the gift of the parts. And to Steve for making them in the first place!
If your interested in checking out Shoodaben Engineering's web site. I'll include a link. http://sites.google.com/site/shoodabenengineering/intake-and-exhaust