thanks guys. that looks like the problem. the inner cable was detached at the carburetor end. i have tried to fix it on to a screw as shown in attached pic. I believe this is the place it should go in. can you please confirm?

also while doing this I had to remove the throttle lever so stretch the cable enough. i seem to be having problem getting the throttle lever back with the right tension for the inner cable so that it stays on and would actually accelerate. pics attached. i couldn't take the pics just before removing the throttle since it just popped out after unscrewing the cover. I am not sure if i got the throttle spring etc assembly correctly fitted.

i have one more problem. the fuel line is cracked and would need to be replaced. both the fuel lines - one to the primer and the other one to the carburetor have cracked at the same time. glad i noticed it while doing the inner cable. any suggestion on where can i get the fuel line and step to install. looks fairly straightforward but would like to follow steps from experts here.

many thanks again.

cheers
dhiren [Linked Image]
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