See also in the Sportsterpedia:
A tickler is any device that is inserted into the bottom hole to 'massage' a little extra gas from the diaphragm.
With the advent off Ethanol, fuel seems to evaporate faster. 1)
By 'tickling' the diaphragm via paperclip or spring type pin, you are allowing fuel to enter the accelerator galley via gravity.
Now when you twist the throttle you will get a clean shot of fuel into the intake.
The Tillotson carburetor runs great, once started.
But even with electric start, when cold, it sometimes takes quite a bit of cranking to get it going. 2)
Sometimes sometimes twenty kicks later, no start. When warm it sometimes takes 3-4 seconds of cranking to start which still seemed too long.
(even with the carb rebuilt, timing, plugs and valve adjustment all spot on)
The one interesting symptom when trying to start it is that there is usually no sound of the cylinders actually trying to fire.
Its almost as if it's not getting fuel.
The Tillotson is unusual in that it does not have a conventional float bowl or even a float, but a fuel chamber.
It has a diaphragm that uses engine vacuum which opens the needle valve to allow fuel to flow into the carb.
This seems to be the genesis of the problem.
No or not enough fuel in the fuel chamber and not enough vacuum generated during cranking to allow fuel to flow into the carb.
The diaphragm in the V-twin kits may be less flexible than the original, contributing to this problem.
There is an old trick of using a paperclip to depress the diaphragm through a small hole in the diaphragm cover on the bottom of the carb.
Starting will improve significantly.
Using the paperclip method can be cumbersome with the fuel line, original air cleaner, circuit breaker and tach cable in the way.
This was made by S&D installed on a HD2D model.
3) 4)
Since vintage ticklers are now pretty much unobtainable, the one below was homemade.
This is an original Tillotson on a 1969 XLH.
7)
Finding and Fixing the Cause of the Degradation That Leads to Intake Leaks:
Article by Dr Dick of the XLFORUM 17)
Original P/N for a Sporty Tillotson repair parts kit 27147-66 18)
Original P/N for a Big Twin Tillotson repai parts kit 27137-66
Tillotson Carburetor repair/ refresh kit19) |