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Ex500 issues

  1. #1
    Newbie Johnpewpew's Avatar
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    Ex500 issues


    So I got an issue with the ex500 I picked up. One of my cylinders is running cold. Like when the bike is up to temp I can touch the left side of the header. But I can't touch the right side. You can also feel the difference in exhaust gas temp. Now I cleaned the carbs good and changed the plugs. That took care of the running ruff for the most part.
    When I'm riding and let off the throttle I get some popping.
    Where should I look to try and solve this? I'm not too carburetor savvy.

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    World Trackday Champion xxaarraa's Avatar
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    Re: Ex500 issues

    LOL this is going to be good.

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by xxaarraa View Post
    LOL this is going to be good.
    I hope so this problem is bugging me. Lol

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    Soul Rider Paul_E_D's Avatar
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    Re: Ex500 issues

    EX500s most common problem is the cheap blade connector to the coil. Check there first.

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    Re: Ex500 issues

    Did you take one spark plug cap off and see if it runs any different?

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by csmutty View Post
    Did you take one spark plug cap off and see if it runs any different?
    No I did not.
    I will also check the blade connector.
    Unfortunately this I'll have to wait till tomorrow it started raining pretty good.

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    Re: Ex500 issues

    Does it 'come into it' with throttle and revs, or is it just one lunging it the whole time?

    As noted, check the basics first, do you have spark, when you pull the plug to inspect it is it wet or dry? From there, is there gas in the bowl of that carb?

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    Re: Ex500 issues

    Just message BJ on Facebook. Literally, about anything EX related. He's forgotten more about EXs than Kurlon knows about rulebooks.

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    Lifer
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    Re: Ex500 issues

    check compression while your there. you may not have enough to fire the mixture.

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    Re: Ex500 issues

    Bring it with you this weekend to the track when you come to meet BJ and the remnants of the EX Mafia to snag a bellypan. One way or the other you'll leave with a running bike.

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    So I'm out doing some more work on the bike and I take the spark plugs out.Ex500 issues-20170808_184819-jpg
    The one on the right came from the cylinder that was running good the one on the left came from the cylinder was running bad what do you guys think I'm currently swapping the ignition coils to see if the problem Falls are cylinder.

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Ok got the coils swapped and the problem is still in the left cylinder. It did not follow. So I'm gonna assume the ignition system is good and say it's a carb issue. Any thoughts

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    Re: Ex500 issues

    Just to make sure, pull the bad plug, put the lead on it and hold THE BOOT so the plug is pressed up against something metal, turn it over and verify you see spark. Could be a bad pickup / CDI which would give you the current symptom set of no fire on one side. (If you hold the plug itself, and it fires, expect a new hairstyle.)

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Kurlon View Post
    Just to make sure, pull the bad plug, put the lead on it and hold THE BOOT so the plug is pressed up against something metal, turn it over and verify you see spark. Could be a bad pickup / CDI which would give you the current symptom set of no fire on one side. (If you hold the plug itself, and it fires, expect a new hairstyle.)
    Yeah that was the first thing I did and both plugs are getting spark

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    Re: Ex500 issues

    Ok, so yeah it's either a lack of compression or something carb related. Do EX500 carbs have bowl drain screws? If so, turn the fuel off then drain the bad carb's bowl and see if anything comes out.

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    Re: Ex500 issues

    Quote Originally Posted by Kurlon View Post
    Ok, so yeah it's either a lack of compression or something carb related. Do EX500 carbs have bowl drain screws? If so, turn the fuel off then drain the bad carb's bowl and see if anything comes out.
    Will do.

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Johnpewpew View Post
    Will do.
    Turn the fuel off open up the drain it drained out all the fuel that was left in the line then in the bowl.

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    Re: Ex500 issues

    Ok, so you know fuel is getting to that carb. On my GS both carbs had vacuum nipples for syncing that normally have caps blocking them off. Anything like that on the EX carbs? Also, when it's running, if you bring the revs up/give it some throttle does the bad cylinder come into it at all?

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Kurlon View Post
    Ok, so you know fuel is getting to that carb. On my GS both carbs had vacuum nipples for syncing that normally have caps blocking them off. Anything like that on the EX carbs? Also, when it's running, if you bring the revs up/give it some throttle does the bad cylinder come into it at all?
    Both carbs have a vacuum line one is capped one is left in the open.
    And yes when I get up around 6 K it seems to come in

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    Re: Ex500 issues

    Now we're getting somewhere, fire the bike up, put your finger over that vacuum line and see what happens. Additionally, with the bike running and that line blocked, spray some parts cleaner at the carb boots so you get some around the interface between the carb and boot and see if the bike's behavior suddenly changes.

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  21. #21
    Super Moderator TheIglu's Avatar
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    Re: Ex500 issues

    That nipple typically is hooked up to a vacuum operated petcock.....

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  22. #22
    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Kurlon View Post
    Now we're getting somewhere, fire the bike up, put your finger over that vacuum line and see what happens. Additionally, with the bike running and that line blocked, spray some parts cleaner at the carb boots so you get some around the interface between the carb and boot and see if the bike's behavior suddenly changes.
    I started it up and put my finger Over the Hole the RPM picked up but it seem to run a bit more shity. I sprayed some starter fluid on the boots and it really didn't seem to do anything. I sprayed about 5 times and 2 out of those five times the idol picked up like some fluid is making it in.

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  23. #23
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    Re: Ex500 issues

    So, question 1) Why is that vacuum port left open? Is there a line to the petcock from somewhere else, or has the petcock been gutted so it doesn't need vacuum to operate? If the answer is gutted petcock, cap that vacuum port.

    From there, might be worth looking over those intake boots for tears, but given it was a semi inconclusive spray test (if you had a proper rip the revs would JUMP) I'm betting they aren't the major issue you're chasing now.

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    Newbie Johnpewpew's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Kurlon View Post
    So, question 1) Why is that vacuum port left open? Is there a line to the petcock from somewhere else, or has the petcock been gutted so it doesn't need vacuum to operate? If the answer is gutted petcock, cap that vacuum port.

    From there, might be worth looking over those intake boots for tears, but given it was a semi inconclusive spray test (if you had a proper rip the revs would JUMP) I'm betting they aren't the major issue you're chasing now.
    Ya I don't think the boots are any of the issue as well. Digging around the vacuum line went to some sort of Emissions Control.

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  25. #25
    Straight cash homey Pittenger5's Avatar
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    Re: Ex500 issues

    Quote Originally Posted by Johnpewpew View Post
    Ya I don't think the boots are any of the issue as well. Digging around the vacuum line went to some sort of Emissions Control.
    Whats your email address, you can PM to me if you want.

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    Quote Originally Posted by Pookie View Post
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