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My 1968 Spider is original Euro spec with Webers and I have a problem with getting the engine to pull past 3000 rpm under load, but only when the car is on the first run of the day. Starting off from cold, I can drive for 10-15 miles and get the engine fully warmed up and still have the problem. But if I just drive a few miles, stop for a couple of minutes and then restart the engine the problem disappears and it pulls strongly all the way to the red line.
I did refurbish the carbs a while ago with a rebuild kit and checked all the jettings and float levels were standard. The rubber mounts were also replaced and I've tuned the carbs with a balancer and a Colortune - idle is very good. I'm thinking it is some kind of vapour lock or air bubble that is purged from the system when sat for a couple of minutes?
I did refurbish the carbs a while ago with a rebuild kit and checked all the jettings and float levels were standard. The rubber mounts were also replaced and I've tuned the carbs with a balancer and a Colortune - idle is very good. I'm thinking it is some kind of vapour lock or air bubble that is purged from the system when sat for a couple of minutes?