TD 14 carb will not turn up engine rpms. up

I just bought this good looking TD14 at Bookers Auction.I can get it started on gas,but it will not rev up to turn over to diesel.I have removed the carb.,cleaned it,I have ample gas to the carb.The little screen on the inlet is clean.carb back on engine,same problem.Could it be in the valve on the carb. inlet, that is operated with the change over process?
 
They don't run real fast at start. You should be able to maximize RPMs with the choke as it warms up, after it has run for a minute or so it should show full rpms with the choke fully open (800-1000 RPM or so). The throttle disc at the output of the carb can be set to change the idle RPMs, I believe the book spec is 7/64" clearance between the disc and the carb body. If it still needs part choke to run best after two minutes or so there is probably still a restriction in the carb jet. E-mail me back if you want to talk more. Brian
 

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