Thanks very much for previous advice.I replaced the twin carbs on my 1977 1500 HL using studs instead of bolts,and found it easy to do that.I replaced all the gaskets,sealing them heatshield to manifold and carbs to heatshield.I got the carbs balanced,jets adjusted etc by a trusted mechanic while I watched,and he got it idling smoothly at 800 rpm.I then took the car fro a run of about 6 miles,and a couple of shorter runs.Everthing went well.However when I went on a longer runs of 15 miles,every time I had to stop at lights etc,the revs crept up to around 1500,with my foot off the pedal.I had previously fitted a new return spring and had made sure the throttle cable was not sticking and the choke was off the cam.Spraying carb cleaner on the throttle shaft ,engine running,did not effect the RPMs at all.Wondering what the problem could be,as it seems to only happen when the engine has been running for a while and the temperature is midway on the guage. Any advice much appreciated.Joe.
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