Yesterday, 08:36 PM
Zenith 30VM downdraft carb (similar to that on a Nippy). The Ulster was running really well when it slowed and would not rev, only tick over. Checked that the fuel pump was working and fuel getting through. Removed the float bowl and the three jets, which were all clear. Blew the jets out anyway - and the holes in the bowl. Reassembled - and it revved cleanly. Has anyone had a similar problem or knows what the cause of this sudden-tickover situation might be?