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  1. #1

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    Default 95 XL possible valve guide seal leak?

    Rear exhaust pipe was blowing out some gray smoke today. Someone once told me that it's normal on a cold start for the bike to puff a little smoke. This how ever was completely different. The bike was at full operating temp. And it was more than just a little puff.
    So my question is how can I tell If the valve guide seals need to be replace with out tearing down the bike?

  2. #2

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    If guides worn i'd do a leak down test. At least it will tell you if valves and piston are worn or not. Odds are off comes it's head.

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    That's not a good sign to start smoking... Like he said do a leak down test..... What do your plugs look like???

  4. #4

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    I'll start there no check the plugs. Thanks for the help

  5. #5

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    I haven't checked yet. I'm going to do that today. Thanks

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    Grey (to black) exhaust smoke is typically indicating a fuel related issue - too rich.
    What were the conditions that lead to the grey smoke - just starting when warm - smoke when revving and RPM coming down - at idle - at a certain RPM? Did you recently changing anything?
    Was it only the rear exhaust - nothing from the front?
    Grey smoke is usually fuel related - a rich mixture, blue smoke is oil burning - is your air filter clogged? Air passage in carb blocked? Fuel leaking through your choke (enrichener) system?
    You sure it's not blue?
    Like he said^^^, check your plugs and research to find out how to read your plugs - what your plug color means.
    Last edited by TriNortchopz; 07-08-2018 at 9:04 AM. Reason: added spacing for easier reading

  7. #7

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    this is the second time that i have noticed the grey smoke. The only thing that i have done recently is check the filter.

    It was only the rear exhaust nothing from the front. The inside of the pipe appears to be wet as well.

    I pulled the rear plug and found it to be very black and dirty. A little slick, the front plug was clean, super clean.

  8. #8
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    How is your float level? If too high,it could cause fouling of rear cylinder. Try swapping plugs - front to back.

    Here is a good post by Sterling on V-Twin forum, from this 2003 thread;
    Rear Cylinder Fouling Plugs

    "I had a similar problem once , it turned out to be the intake manifold rubber gaskets,
    Did you have check your plugs?, ( ie flip them around, if the problem tracks, your plugs are OK) if not, change the plugs, then try flipping the spark plug wire around,
    if all is OK, then take a serious look at your manifold gaskets, What I suspect is happening is your front rubber is leaking, causing the front cylinder to suck air and run a little leaner than normal, unfortunately the air leak wil cause the rear cylinder to take the lions share of the fuel, hence it runs rich and fouls the plug. the backfires are a consequence of fuel overload in the rear cylinder."
    http://www.v-twinforum.com/forums/ev...ing-plugs.html

  9. #9

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    If the plugs were fouled wouldn't they smell like fuel?

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    Quote Originally Posted by zipzip View Post
    If the plugs were fouled wouldn't they smell like fuel?
    Not really.....Not if it's oil fouled.....

    I'm not going to say what I think it is just yet until you do a leak down test.....

    My guess is w p k h s o, r b..... I will fill it in later......
    Last edited by Tattooo; 07-08-2018 at 7:47 PM.

  11. #11

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    My guess is w p k h s o, r b..... I will fill it in later......[/QUOTE]

    That'll ruin anyone's day...

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    Replace the manifold seals if you pull the manifold for inspection. Best to have new ones in hand before you start.

    Plugs aren't akways a "fires or doesn't" issue so I replace (or blast clean the old ones for troubleshooting if you have a blaster, but the roughened blasted plug surface will foul quicker than new) them when troubleshooting. I keep spares since plugs are consumables.

    w p k h s o, r b
    I'm eagerly awaiting this new acronym.

  13. #13

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    Your killin me. What the heck does w p k h s o, r b mean? Don't think I'm gonna be able to do a leak down test anytime soon.

    Put Some new plugs in waiting to see how they look in a day or two. Still have a little bit of smoke puffing out of the rear exhaust, not gonna lie.

    Also thinking about getting one of those Nubs tools. To replace the valve seals while leaving the heads on the bike! And thoughts on that?



    QUOTE=Tattooo;793474]Not really.....Not if it's oil fouled.....

    I'm not going to say what I think it is just yet until you do a leak down test.....

    My guess is w p k h s o, r b..... I will fill it in later......[/QUOTE]

  14. #14
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    Quote Originally Posted by zipzip View Post
    Also thinking about getting one of those Nubs tools. To replace the valve seals while leaving the heads on the bike! And thoughts on that?
    It would be a waste of time and money.....

    What does w p k h s o, r b mean? That's my guess to what I think your problem is considering the year of your bike..... here is a hint h is has... o is out

    I don't want to say because I hope I'm wrong...
    Last edited by Tattooo; 07-12-2018 at 8:18 PM.

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    A patch job is usually a short time cure...

    The bike is 23 years old and most likely could stand a complete top end job done to it...

  16. #16

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    Think I'm going for the top end rebuild. Might as well just get in there and see what's going on.


    Quote Originally Posted by Dragstews View Post
    A patch job is usually a short time cure...

    The bike is 23 years old and most likely could stand a complete top end job done to it...

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    Quote Originally Posted by zipzip View Post
    Think I'm going for the top end rebuild. Might as well just get in there and see what's going on.
    Before you pull it apart, it would be good to do a compression test, and if possible, a leak down test and record the results - they will help with diagnosis upon inspection and measurement of disassembled parts.

    Here is some basic info for leak down test - including building your own tester:

    A leak down test will pressurize the engine through the spark plug hole while at top dead center (TDC). When at TDC, all intake and exhaust valves will be closed, and the piston will be at the top of its stroke. The only way air pressure can escape is through the valves, piston rings, and head gasket...
    https://www.howtomotorcyclerepair.co...est-diy-build/

    Even just connect an air hose to the spark plug hole for a basic leak down indication, and listen for air escaping with piston at TDC on compression stroke.

  18. #18

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    So are we going to find out what the heck this means???

    w p k h s o, r b

  19. #19
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    ....... Curiosity Killed the Cat .......

  20. #20
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    I wouldn't pull it apart without testing, and if I'm gonna replace all the same parts eventually anyway a bit of smoke doesn't bother me. Of course if you're gonna pull it apart you could add a few more ponies.

    So are we going to find out what the heck this means???

    w p k h s o, r b
    It's obviously broshkpw spelt backwards and posted with broken formatting to further obfuscate it.
    Last edited by farmall; 07-18-2018 at 6:55 PM.

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