New Air Filter = GL500 won't go past 45 mph...Carb issue? - Page 3
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Thread: New Air Filter = GL500 won't go past 45 mph...Carb issue?

  1. #21
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    Have you had a chance to re-tune it. If you tuned it and then changed the dirty filter, then you tuned the mixture and idle to compensate. Otherwise it's possible you bumped a wire loose. A bullet connector I guess are used on these, I only remember them from the real old days working on 60's Fords.
    They look like one of these. https://www.digikey.com/products/en/...FduNswodppEHZQ

    Adoom was referring to that type of connector that feeds the ignition coils I'm guessing. I haven't had to get to into electrical much yet, knock wood
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  2. #22
    Senior Member Interstater's Avatar
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    From his initial description I would suspect the vacuum fuel petcock is starting to fail.
    A dirty filter = more vacuum which a weak petcock might work with.
    A clean filter = less vacuum that a weak petcock might not work ok with.
    Rebuild it or replace it with a manual one.

    When the petcock went on my silver GL the bike would start and run ok, but would not pull above 45mph or so.
    purplecx500 likes this.
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  3. #23
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    Interstate that makes sense. I think I will look into that and try that.

    Thanks,

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  5. #24
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    Thanks Interstater. I rebuilt my petcock and it runs better but still struggles. I am wondering if I need to do more. I am going to pull the strainer out and clean that, and then run some SeaFoam through the engine. I also thought about replacing the fuel lines. But I don't exactly know what I am doing. can someone explain what function the three lines (two small and one larger) serve in the fuel system? The two small lines run off toward the middle of the bike, ones goes straight into the carbs(?) and then other threads down through the frame and hangs open below the bike. That seemed strange but I know very little here. The third larger line goes off the side of the petcock in the direction of the rear of the bike.

    Any help on what these fuel lines are doing and also, maybe a suggestion on what to try next to get my acceleration and top speed back to normal?

    Thanks!

  6. #25
    Super Moderator Sidecar Bob's Avatar
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    Did you ever check the vacuum line that runs from the left side of the right carb to the petcock? If it is loose or cracked it can cause the vacuum petcock to not open completely, which could lead to fuel starvation.

    Also, when you rebuilt your petcock did you clean the strainer that goes over it inside the tank? It should come out with the petcock but sometimes they get stuck in the hole.

    BTW: Your bike can't be an '83 GL500. They were only made in '81 & '82
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  7. #26
    Senior Member purplecx500's Avatar
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    1 fuel line petcock to carbs large

    1 vacuum line side of carb. to petcock

    2 drain hoses from carb lower area going down

    sorta to back

    when you say larger don't look at O.D.

    Inside diameter is what matters.

    Have you read FSM section dealing with carbs.?

    It is very clearly shown.

    Or block vacuum port and use this::

    M18x1 Gas Fuel Petcock Tap Switch For 1982 - 1983 FT500 1981 -1982 GL500 Silver | eBay
    Last edited by purplecx500; 05-30-2017 at 07:11 PM.
    SideCar Bob's settings. http://cx500forum.com/forum/general-...ould-make.html
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  8. #27
    Super Moderator Sidecar Bob's Avatar
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    Quote Originally Posted by TheRoyalYouth View Post
    The third larger line goes off the side of the petcock in the direction of the rear of the bike.
    I didn't notice that you asked about that until Purple posted (+1 on what he said). As he said, the large one is the actual fuel line. On a GL500 it should go from the petcock directly to the inlet on the carbs, just below and a few inches rearward from the petcock and in the open where you should be able to see it clearly.
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  9. #28
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    G-Loria's Story including Part III > I miss her dearly, but she is in good hands. Part III included at the end of the link.

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  10. #29
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    Thank you guys! I am not seeing nay improvement unfortunately. So far since changing the air filter I have:

    Rebuilt the petcock

    Replaced Vacuum Tubing and Fuel Line

    Cleaned the fuel strainer

    Added SeaFoam to my gas tank

    It still doesn't want to go above 45-50 mph. When I try to rev high I get the "sound" of higher rpms but it feels bogged down and slows down. When I listen to the sound of my exhaust it gets louder and sharper than the normal engine noise coming out. Its like I am just not getting the power I need in the 5th gear.

    Any more ideas? I keep asking because I have very limited time to work on it. So when I DO get the time I want to make sure I use it wisely.

    Thanks.

  11. #30
    Super Moderator Sidecar Bob's Avatar
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    Is your tachometer working? What happens to the RPM when all of that happens? If the RPM increases but the speed doesn't your clutch may be slipping....
    Summer - Mr. Honda ('83 GL1000/Dnepr)
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