Hi,hoping you can help.
1988 Mini City 998cc / Maniflow manifold / 1.75" RC40 / AAU needle / new coil, new leads, new points, new cap.
Have had the mini running now for approx 500 miles and 90% of the time no problem. Have altered the mixture a few times to get it a little smoother and this was achieved other than one every so often (especially when cold) its idle drops really low, runs lumpy and misfires occasionally and bog down. Park up and drive home after an hour and it runs great or will start running great 10 minutes into journey...
Yesterday, i set the timing and mixture etc from scratch. Started at 8deg and adjusted mixture. Ran well, no problems but really down on power. So re-timed but this time used the advance function and followed the instructions, advanced to approx 30degs @4000rpm, ran it down the road, the slightest bit of pinking underload so backed it off 2degs. Took it back out, and it flew! sweet as a nut, no flat spots anywhere - really pleased.
Today, take it out, let it get to temperature and it runs awful! Misfire under any sort of load, bogs massively, like its getting no fuel. Pulled over and richened the mixture about 5-6 sides of the nut and had to bring the fast idle up to stop it stalling. It ran better but was really burbling and still wasn't happy at low revs but it did run well with some accelerator.
Any idea what to check? Surely something is stuck / blocked? As it was set yesterday and was perfect. Now today i have altered quite a bit just to get it drivable...
Many Thanks in advance.