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Scooter Engine Trouble

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    FatHandedChap
    16 Sep 2008 - 7:33 PM

    Any mechanically minded people who could have any ideas.
    I've got a four stroke 125 scooter which is playing up. It starts fine, ticks over fine, but has sluggish acceleration (especially if you wind it right open) and also goes really sluggish once it reaches 45mph ( it was previously really nippy and easily made 60mph). My thoughts are something around the carb, but I'd be happy to be proved wrong.

    Cheers

    Tony

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    dougv
    dougv Site Moderator 108376 forum postsdougv vcard England3 Constructive Critique Points
    16 Sep 2008 - 7:40 PM

    It certainly wouldn't hurt to clean the carb out Tony.
    It sounds like the main jet has a blockage which will make it run weak at anything except tickover.

    A long time since I did anything with carburettors.

    Smile

    FatHandedChap
    16 Sep 2008 - 8:06 PM

    It ran fine the other day for one journey, but has been pants for the past couple of weeks and the scooter is only 3 months old!

    Dugi34
    Dugi34  7917 forum posts United Kingdom
    16 Sep 2008 - 8:25 PM

    I would take it back to your supplier if it's under warranty, or you may void any warrnty on the scooter. It could be an electrical fault, especially if you have been caught in our "summer" weather, Check the spark pug and h.t. lead as well as the carb if you are going to attempt a repair. good luck.
    Doug

    FatHandedChap
    16 Sep 2008 - 8:28 PM

    The joys of a chinese import, warranty is for parts only. Just wondering if it's something simple before I take it to a bike shop.

    Dugi34
    Dugi34  7917 forum posts United Kingdom
    16 Sep 2008 - 8:33 PM

    Did you by any chance run out of fuel or run the tank almost dry before it started playing up ? it could be a simple blockage in the fuel line or filter if it has one, or the carb as previously suggested.
    Doug

    cameracat
    cameracat  108578 forum posts Norfolk Island61 Constructive Critique Points
    16 Sep 2008 - 8:54 PM

    ? Has it got very wet in recent days......?

    It's possible that some damp or water lodged near the ignition coil/leads/Plug cap etc....Will allow the engine to run, But because of a weakened spark ( due to damp ) cause loss of power, Especially under load........!

    HTH......

    brian1208
    brian1208 e2 Member 1110269 forum postsbrian1208 vcard United Kingdom12 Constructive Critique Points
    16 Sep 2008 - 8:54 PM

    Sounds like a carb and or fuel filter problem to me too.

    One thought, have you had the scooter out in this recent wet weather, I'm wondering if you've got a slug of water in the fuel / carb?

    FatHandedChap
    16 Sep 2008 - 8:55 PM

    Always a couple of quids worth of fuel left in the tank before a fill up, will check fuel filter and carb tomorrow.

    Not a fair weather rider so it has been enjoying a shower or two lately.

    Last Modified By FatHandedChap at 16 Sep 2008 - 8:56 PM
    ripleysalien
    17 Sep 2008 - 10:22 AM

    3 months old, parts only or not, take it back as it is not fit for the reason it was sold. 12 months standard on goods in the uk regardless of where made, take it back and TELL, dont ask them to fix the problem or return it for a new one.

    Steve

    jondf
    jondf  82475 forum posts
    17 Sep 2008 - 9:32 PM

    Could be timing or as already said, carb setup. However, I had a Vespa 50 once. It developed a similar problem. I went back to the garage where it was bought and a mechanic took hold of a longish metal bar and rammed it up the exhaust half a dozen times then revved the engine a bit and a load of rubbish flew out. It was ok after that. However, can't remember whether it was 2-stroke or 4

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