NF Mighty NF forum 2016x>




Author Topic: rubnning rich  (Read 51 times)

guzzied

  • Newbie
  • *
  • Posts: 3
    • View Profile
rubnning rich
« on: October 01, 2022, 11:55:52 am »
my NF seems to be running rich; The spark plug sooted up and stopped sparking until I cleaned it; Is there a mixture adjustment on the carb or could it be a worn needle?   Many thanks for any info,

Share on Facebook Share on Twitter


banquo

  • Administrator
  • Hero Member
  • *****
  • Posts: 981
    • View Profile
Re: rubnning rich
« Reply #1 on: October 03, 2022, 11:47:08 am »
Could be any number of things.
The only adjustment is the pilot jet which has little influence above tickover.
When my plug has fouled with soot, it's usually been caused by failure of the coil (twice) and condenser (once).
If you're sure it's carburettor, the first thing to check is the enrichener plunger. There's a rubber seal at the bottom which is supposed to stop fuel passing except when the enrichener is open. The rubber hardens and perishes, and can then allow fuel to pass even when the enrichener (choke) is closed.
Obviously, make sure the cable for the enrichener is seated and adjusted correctly, so the plunger is fully down.
That's the most likely cause.

guzzied

  • Newbie
  • *
  • Posts: 3
    • View Profile
Re: rubnning rich
« Reply #2 on: October 03, 2022, 11:49:24 am »
thank you, I'll have a look.

Gaffertape

  • Newbie
  • *
  • Posts: 18
    • View Profile
Re: rubnning rich
« Reply #3 on: November 27, 2022, 08:09:22 am »
Had a similar issue with mine  when i first got it  years ago , it was the choke  cable seating at the carb , the cable wasnt returning the plunger fully , i replaced the cable and adjusted it , no problem since
cheers
Ric
Like Like x 1 View List