Dltx 16 runs best with idle needle closed

SLH4250 · May 25, 2023

I have a model D with dltx 16. It runs ok but if I close the idle needle it smooths out and runs great. Open the idle needle and it s running rich smokes and hunts a bit. Load needle open about 1 turn and fuel level in the bowl is 3/4" below the gasket. What should I look for? I have gone through the carb with the right drill bits and instructions from Roberts but did I miss something?

Mark-Ia · May 25, 2023

You missed the secret passage at the bottom of the stem

SLH4250 · May 25, 2023

I took it apart again and cleaned all the passages. While
blowing it out with air I put in the plugs in order to make
sure every passage had good airflow. With the air gun
pointed down the vertical idle passage, I felt air pressure
rushing out around the brass plug that guards the secret
passage at the bottom of the stem. Looking closer I can
see that the hole is way oblong on one side so the plug
wont seal. It still threads in good but theres an obvious
leak there-the idle needle cant control the fuel flow.
Right or wrong I put the brass plug back in and put a tiny
dab of jb weld on. Will see if it helps when it sets. The
hole almost looks like it was drilled that way

Dltx 16 runs best with idle needle closed

SLH4250

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Mark-Ia

Well-known Member

SLH4250

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