re TriMac 210. The diaphram in the engine appears to have
lost flexibility. A replacement is obviously the answer - can
you suggest where I can obtain one. Thanks

GR Wells, March 2008

I am fairly sure it uses a zama C1U CARB.
You should remove it and look for the model number and brand.
If you take it apart you can see all the parts gaskets diaphram etc. I go to ebay to look at the kit parts and see if they match with mine to get the right kit #.
Then you can shop for price online if you want.
Lowest prices HERE
http://www.mowpart.com/carburetor-zama-p-2718.html
Be sure of your carb make and model numbers

Bob, March 2008