Disassembled the rear carb tonight. Throughly cleaned. The accelerator pump piston and chamber are clean. No restrictions. Nozzle is clean and ball bearing present. All passage ways cleaned. Reassembled it with new gaskets. One thing I did notice was that the nylon roller on the accelerator pump lever is difficult to spin. It catches the cam and doesn't move smoothly. Tried freeing it with a WD-40, etc. and just not getting loose. Not sure if this is a part that is available. Suggestions?