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Thread: Pit bike wont start

  1. #1
    Should Get Out More Trogladyte's Avatar
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    Default Pit bike wont start

    Wont start.

    Tried to remove plug but cap snapped in my hand. Plug is also rusty. New plug and cap. Is there a spark? Yes. Check.

    Won't start.

    Squirt of easy start. Vroom. Chugga cough. Stop.

    OK lets look at fuel.

    Fuel reaching float chamber. Check. Main jet clear. Oh. No. Not clear. Clear it with carb cleaner and compressed air.

    Wont start, except with easy start for a second or two.

    Take carb off. Carb cleaner and compressed air everywhere. Replace. No difference. Plug does nbot smell of petrol.

    WTF?


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  3. #2
    Should Get Out More maccecht's Avatar
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    Default Re: Pit bike wont start

    Did you take the pilot out and clean that? Also some carbs have a small drilling in the corner of the float bowl which can clog up. Soak the carb in a bottle of cheap coke for a few hours the carbonisation helps clean all the little drillings out. doesn't have to be coke mind

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    Should Get Out More Trogladyte's Avatar
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    Default Re: Pit bike wont start

    Quote Originally Posted by maccecht View Post
    Did you take the pilot out and clean that? Also some carbs have a small drilling in the corner of the float bowl which can clog up. Soak the carb in a bottle of cheap coke for a few hours the carbonisation helps clean all the little drillings out. doesn't have to be coke mind
    No. I just fucked with the main jet.

    OK. Thanks. I kind of knew I needed to clean the stupid carb more.

    Coke? Are you sirius?

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    Should Get Out More maccecht's Avatar
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    Default Re: Pit bike wont start

    Quote Originally Posted by Trogladyte View Post
    No. I just fucked with the main jet.

    OK. Thanks. I kind of knew I needed to clean the stupid carb more.

    Coke? Are you sirius?
    Very, all the little bubbles break down the varnish old petrol.

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    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Pit bike wont start

    Blocked pilot jet and possibly blocked cold start jet.

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    Default Re: Pit bike wont start

    Quote Originally Posted by Julian_Boolean View Post
    Blocked pilot jet and possibly blocked cold start jet.
    Thanks. Sounds like a good call. Had enough of it for today. It's already given the boy a very sore foot (kicks back like a mule). I'll do the carb a bit more thoroughtly tomorrow. Everything else works - so it must be a carb issue.

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    Default Re: Pit bike wont start

    If you clean the carb and it still wont go, buy a new one. Try Petrol Scooters, cheap as chips.

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    Default Re: Pit bike wont start

    This is driving me bonkers.

    I've stripped and cleaned the carb twice, and it still wont go. WTF? doesn't help that due to my asthma/COPD I can't persist too long with kickstarting it. I'm beginning to think about leaky valves and other random shite. It kiscks back like a twat and tries to start on easy start, but only runs for a second or two.

    I'm close to torching it.

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    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Pit bike wont start

    Has it got a spark?
    Is the plug wet?
    Does it have compression?
    Is the valve timing correct?

    There isn't much else to check.

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    Default Re: Pit bike wont start

    Quote Originally Posted by Julian_Boolean View Post
    Has it got a spark?
    Is the plug wet?
    Does it have compression?
    Is the valve timing correct?

    There isn't much else to check.
    Yes, there's a spark.
    The plug is not noticeably wet.
    Yes, it has compression - although I think a valve does stick sometimes - just occasionally it will kick through a cycle too easily.
    Valve timing seems most unlikely to have slipped - as it hasnt been apart.

    And with a squirt of easy start it'll go for a second or two.

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    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Pit bike wont start

    Is fuel getting into the float bowl?
    Have you checked the float height?

    Is it worth getting a mechanic to look at it?

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    Default Re: Pit bike wont start

    Quote Originally Posted by Julian_Boolean View Post
    Is fuel getting into the float bowl?
    Have you checked the float height?

    Is it worth getting a mechanic to look at it?
    Yes - there is fuel getting tot he float bowl, and I have removed the float and needle valve and cleaned them out, and I've dropped the drain on the float bowl - when you turn the fuel on, it pissed fuel, so it's getting to the bowl.

    I've also removed the pilot jet, main jet, and emulsion tube, and blasted them with carb cleaner and compressed air. And no I haven't ckecked float height, but it shouldn't have changed. should it?

    And yes - I may have to get a grown up to have a look. But FFS, I SHOULD be able to fix it!

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    Should Get Out More Julian_Boolean's Avatar
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    Default Re: Pit bike wont start

    I had a GT185 that would change it's own float height, only reason I suggested it.

    I also had an XR250 that if you left it for a couple of weeks would take about 50 kicks to start.

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    Default Re: Pit bike wont start

    New carbs are stupid cheap. Much cheaper than your time and stress trying to fix one which may or may not be busted. Just a thought.

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    Default Re: Pit bike wont start

    If the float height is out it can either get no fuel or way too much flooding it straight away. Do you have a manual to get the float level? Get a bit of clear plastic tube put it in the drain from the float bowl and make a U shape so it is up the back of the carb. Open the drain screw and see where the fuel level gets too it should be roughly 5mm below the top of the float bowl [average on most bikes] . However the manual will give you the correct level. You should get it near enough so the bike will start. Just need to tweak the float tang a little to change the level.

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