Diagnosis Conundrum! Carbs...

Information and questions on GL1200 Goldwings (1984-1987)
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Posts: 1
Joined: Mon Sep 17, 2012 3:59 pm
Location: North Hollywood, California
Motorcycle: 1986 GL1200 Interstate

Diagnosis Conundrum! Carbs...

Post by jp3rks » Mon Sep 17, 2012 4:14 pm

I am having some trouble really figuring out the problem here. Your help would be great!

The bike starts fine. It runs great while the choke is ON. However, when I take the bike off choke, it won't rev. It just chugs. (It will rev if the choke is on.)

Here is what I've done (or investigated) so far:
  • Cleaned out Pilot Jets, main jets
    New gas
    New Fuel Filter
    Replace fuel cut off relay
    Replace fuel pump
    New Spark plugs
I recently went through and thought the fuel pump wasn't pumping, because the bike acts like it is not getting enough gas. However, I put a new fuel pump in and it had the same problems.

Any thoughts would be much appreciated!

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Posts: 88
Joined: Wed May 30, 2012 6:16 pm
Location: Norwalk, Ohio
Motorcycle: 1986 Gl1200A Aspencade

Re: Diagnosis Conundrum! Carbs...

Post by bwagner6 » Mon Sep 17, 2012 4:57 pm

I think you are on the right track.... sounds like it is way too lean since useing the choke helps. Keep in mind a lean condition could be lack of fuel OR too much air in the mixture. I would check all the vacuum hoses for leakage. Did you do a complete carb cleaning? lots of tiny passages that can get clogged too.... Good luck and keep us posted.

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Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
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78 GL1000
81 GL1100
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84 GL 1200 I

Re: Diagnosis Conundrum! Carbs...

Post by virgilmobile » Tue Sep 18, 2012 12:29 pm

Stick a mirror down the plenum and verify the slides pop up when you snap the throttle open.air flow should lift them.All 4 of them at least 1/3 stroke up.Stuck slides will lean the engine.The "choke" is actually a fuel enriching valve that let's more gas bypass the jets.

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