Tuning time. The heat tube to the auto choke had a crack in it so I braised it up when I did the engine overhaul, but I stuffed up and brass had run into the tube and blocked it. The choke wouldn't go all the way off. I don't think you can buy them anymore or trying to find a good secondhand one in good condition would be a big ask. Decided to make a new heat riser. I have heaps of 1/4" bundy tube and flair tool so thought I would have a go. Cut the old pipes off the old bracket that bolts to the inlet manifold and used the old nut. Flared one end of the pipe then bent the pipe in the middle around a 17mm die 180 degrees then put both ends back through the bracket/plate. Then bent the ends to the same angles as original. A bit tricky but worked out ok, then silver solder the tube to the plate.

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I had flat spots in the carby and generally wasn't happy with the way the quadrajet was working. decided to remove and strip it. The carby was reconditioned by a company that specialises in them but its been sitting around for a while and the overhaul was organised by my mate just before I purchased the van. I haven't done a quadrajet in the last twenty years and not a expert on them, but hay all carbys work on the same principals. when I stripped it I remembered how fiddly they are. Took me four hours checking and setting everything up. I found the primary jet part throttle settings was way out, and the secondary linkages were around the wrong way so they would have never opened. Had to resort to finding a sematic for the vacuum hoses on line. All sorted I put the carby back on. I also left out the plug in the top of the housing and made a mixture adjusting tool. Let it worm up and set the cold high idle step screw. Once at operating temperature set the timing and idle mixtures, then raised the engine speed to 3,000 rpm and set the part throttle mixture setting through the hole in the carby top. Reset idle speed and idle solenoid. Big, big difference. runs sweet. No rego so didn't take it out on the road but my driveway enabled me to get into third and 70kph so I think that's a good enough test.


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