Not sure if my problem is electrical, engine or something else...
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Thread: Not sure if my problem is electrical, engine or something else...

  1. #1
    Member Honda Al's Avatar
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    Not sure if my problem is electrical, engine or something else...

    Hi all,

    I have a CL350 that revs 2000-3000rpm when coming to a stop at a junction. If I let the clutch out it does calm it down to ~1100, and if I'm in the garage trying to get it to tick over it'll stall after about 30secs (with no excessive revving). Sometimes re-starting it takes a few attempts.

    The reason I'm not sure if it's electrical is because I can see the left hand timing cover arcing across to the spark plug. I've attached a picture.

    Apart from this issue the bike once running is perfect, and pulls nicely through the gears.

    Any help or advice greatly appreciated.

    Alan




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    Last edited by Honda Al; 01-08-2017 at 09:03 AM.

  2. #2
    Senior Member doode's Avatar
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    You may want to invest in some new plug caps and plugs and good connection to the head

    What is the maintenance history?
    dtsmjr8dan likes this.

  3. #3
    Senior Member dtsmjr8dan's Avatar
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    New caps for sure !
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  5. #4
    Member Honda Al's Avatar
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    Quote Originally Posted by doode View Post
    You may want to invest in some new plug caps and plugs and good connection to the head

    What is the maintenance history?
    No idea on its history. It was a 'barn find' import to the UK. It's only been on the road with me since October.

    What do you mean by good connection to the head?


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  6. #5
    Super Moderator J-T's Avatar
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    Not sure what the "connection to the head" is either but your spark plug cap is likely cracked allowing it to arc to the head. I'd replace the caps and at least make sure you have the proper plugs installed for your bike, probably replace them too.

    I doubt this will fix your other problem but it needs to be done anyway.

    Nice camera work!
    JT
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  7. #6
    Senior Member Old Putz's Avatar
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    The revving/stalling problem is often associated with an intake leak. Do you have old/hardened/cracked carburetor boots, and do they have a good seal where they mount to the cylinder head? Nice photo!
    TOOLS1 likes this.
    Yeah, I've been doing this for a while...

  8. #7
    Member Honda Al's Avatar
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    Cheers everyone. The picture was just using my iPhone with my finger held down taking 101 pictures until I got the best one!

    I'll investigate all those points and report back.

    Any recommendations on spark plug caps?

    Alan


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  9. #8
    Senior Member mike in idaho's Avatar
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    A sticking spark advance unit can also cause hanging idle problems.
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  10. #9
    Senior Member doode's Avatar
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    To make sure the threads are clean so they ground to the head. Who knows... Maybe the threads are covered in Teflon tape or have a bunch of corrosion etc



    Quote Originally Posted by Honda Al View Post
    No idea on its history. It was a 'barn find' import to the UK. It's only been on the road with me since October.

    What do you mean by good connection to the head?


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  11. #10
    Super Moderator outobie's Avatar
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    that picture is outstanding!

    as stated above. sounds like a combination of issues.

    Fix this first - cracked spark plug boots...replace them

    Fix / test this second - cracked or loose rubber intake boots (when the idle is racing spray starter fluid all around the rubber boots. if that has an effect on your engine speed replace the boots and gaskets

    fix/test this 3rd - possible ignition advancer issue ---sticking or weak springs. check idle with a strobe light...to make sure it advances AND retards smoothly on both sides if not replace/repair the advancer
    dtsmjr8dan likes this.
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