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Made up another exhaust stack for the C-125 this morning. The one on was an old BSA motorcycle silencer. The outlet pipe was rather holey, with a cut up tin can wrapped round and held by jubilee clips. So cut off the bad bit off the BSA one and the tail end off a tractor one. The result.

thanks guys, here's a video

The C-121, Black Horse, started to refuse to run right after standing all night in the cold at the HVC rally. Would only run on half choke. Managed to get it to where it was on display with it's stable mates. When the rally ended and I eventually found the time to load up, it refused to start at all. With some help it was pushed up onto the trailer. Back home and rolled off and put away. The following morning I decided to investigate, as I wasn't due back at the rally site till after lunch, (1 day rally. 5 days work.) to collect the cattle trailer loaded with rally equipment., to take back to the farm. Good spark from the plug but plug dry. Disconnected pump from carb and a good flow through the pump. Removing float bowl from carb revealed bits of black dirt in there. So off with carb and cleaned out the jets. In line filter look clean so I drained the fuel tank. Some dirt was evident in the fuel, so I removed the tap. I then poured fuel into the tank to flush it out. After putting everything back together, the engine fired up straight away. I then tuned the carb and now he Black Horse runs as normal. I suspect the bouncing of the trailer disturb some bits of dirt. Hopefully all will be back to normal, but if it happens again I will take the tank out for a thorough clean and also replace the fuel lines in case the are starting to deteriorate inside