Can overly rich idle cause a surge

Information and questions on GL1500 Goldwings (1988-2000)
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Posts: 99
Joined: Fri Sep 08, 2017 9:08 am
Location: Clermont Ga
Motorcycle: 1992 GL1500 Interstate

1978 CB750 Supersport

Can overly rich idle cause a surge

Post by 754 » Sun Sep 09, 2018 6:32 pm

As my subject line states is it possible for an overly rich idle to cause an engine surge? I pulled the pilot screws and cleaned the passages, and replaced the orings when I cleaned the carbs when I first got the bike. I counted the turns in to seated for both screws and set them back when I put them back, and after putting a couple of hundred miles on it, it still has a small surge and is very rich at idle. I know that they are not the minimum 2 turns out like the book says to start at. I'm looking to reset the pilots per the manual, hopefully this week if I get time.



1992 Goldwing Gl1500 Interstate

1978 CB750 Supersport

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Posts: 1124
Joined: Wed Nov 10, 2010 8:09 pm
Location: Glastonbury,CT
Motorcycle: 1988 GL1500

Re: Can overly rich idle cause a surge

Post by ct1500 » Sun Sep 09, 2018 7:11 pm

Possible yes probable no. Surging is a classic case lean condition in an engine which can be easily verified with the addition of a spritz of carb clean spray into the carb intake air stream. If RPM rises and smooths out it is lean. :)
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