[Mgs] HIF Carb Hesitation

[PaulHunt73]

This could be either initial enrichment or fuel delivery as you seem to have two symptoms. 

You can check the damping for initial enrichment by unscrewing the cap, lifting it up, and pressing it back down.  You should feel significant resistance before the cap reaches the piston cover.

For fuel delivery remove the pipe from the front carb (it may spurt if the ignition has been on recently), direct it into a container, and switch on.  It should deliver a minimum of one Imperial pint per minute and in practice at least double that, in a continuous series of pulses with minimal bubbling.

Hesitation can also be caused by the earth wire inside the distributor having failed, and flat spots at higher speeds from an incorrect needle profile.

PaulH.
  ----- Original Message ----- 
  From: daybell7--- via Mgs 
  To: mgs at autox.team.net 
  Sent: Thursday, June 07, 2018 9:58 AM
  Subject: [Mgs] HIF Carb Hesitation


  My ‘72 B hesitates when I accelerate, especially when I initially press the pedal.  I switched to a 20w dashpot oil, but no change.  I’ve used carb cleaner on the pistons and cleaned the jets.


  I could tolerate the hesitation upon initial hesitation, but the car misses once on the highway at high speed.  If I back-off the acceleration slightly, the engine will catch.


  I bought the car 10 years ago but never rebuilt the HIF carbs.  I don’t use it regularly and haven’t had the problem until recently.  Besides the pistons not responding properly, I thought maybe it’s fuel flow or a float sticking?


  Thanks for help in advance.
  Steve Hughes
  Gainesville, FL







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