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Thread: Zx9 carb issue

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    Zx9 carb issue

    Trying to fire the escort for the first time since the rebuild. We're having a few issues tho. The pump runs when the pipe near the carbs isn't attached and pumps fine. When attached to the carbs it stops like it's built the correct pressure and doesn't pump during cranking. so I have a few questions

    shpuld the pump be live on the crank cycle too as well as position 2 or should all power go to the starter and just the vacuum on the engine be enough to suck enough fuel through to get it going ?

    also at what point should the idle screw wire be set and choke. Could these be causing a pressure lock and unabling it to bleed the fuel through ?

    Thanks

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    World Champion Decade Plus User alladdin's Avatar

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    Zx9 carb issue

    If bowls are full then pump not running during cranking shouldn't matter for now.
    Is ign live during cranking ? That matters obviously


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    Re: Zx9 carb issue

    Bowls are not full. It seems to turn the pump off as if the correct pressure has been reached when the fuel just gets to the fuel filter. Filter is fine I've had it off and blown through it and pumped fuel through it too. Like they're a something blocking the fuel to go through. Will Holding the choke or accelerator open help in any way or does that just do the flap and nothing to do with the fuel ?

    if ignition left on it pressurises the system but then like it has a massive air lock or blockage in the carb so pump turns off

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    Re: Zx9 carb issue

    Firstly what pump are you using? You'll generally never completely fill the fuel filter - mine is usually only a 1/3 to 1/2 full at most! If a bike pump then as soon as the bowls are full the backpressure will stop the pump - they ain't called interrupter pumps for nothing!

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    World Champion Decade Plus User alladdin's Avatar

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    Re: Zx9 carb issue

    is it pumping uphill ? i dont think they like that. also i dont think they will pull from tank - need a swirl pot local maybe.(not sure on that one)

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    You need the pump directly below the tank to work properly. They don't like to suck.

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    Re: Zx9 carb issue

    Yeah it's the pump from the same bike as the carbs. Also the pump is directly under the tank and the tanks half full so quite a weight pushing the fuel down. I've heard of swirl pots before but I'm sure before I bought them i read bunerous times people don't need them

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    Re: Zx9 carb issue

    The pump on my bike is below the tank bottom and pumps happily enough up about a foot to the carbs which are above the engine - its a vee twin.

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    Re: Zx9 carb issue

    So it's not the location of the pump that's the issue. Anything in the carbs to check or do that could of possibly stuck closed ?

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    Re: Zx9 carb issue

    Or blocked

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    Re: Zx9 carb issue

    And they carbs or kekins or something. Can't remember the exact name without looking. Going to have another bash shortly

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    Daft suggestion but just make sure you've got the pipes on the pump the right way round.

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    Re: Zx9 carb issue

    Is it true the carbs need to be at the same angle as when in the bike otherwise the needle valve in the float closes too early.

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    Re: Zx9 carb issue

    Quote Originally Posted by a.south1234 View Post
    Is it true the carbs need to be at the same angle as when in the bike otherwise the needle valve in the float closes too early.
    Its a good point and is so true! There are basically two angles - sidedraught and downdraught. Side can be from flat to mildly angled, down draught are markedly angled down wards BUT with both types the critical item is the float bowl joint which must be level / parallel with the ground. So carbs that are normally transverse and parallel to the road could be fitted at an angle of 4 - 8 degs in a RWD install. Using a downdraught carb mounted 'flat' will not be successful - either leaking, running rich or lean.

    @OP - why do you think there is something blocked or that the bowls aren't full? These pumps don't produce 'pressure' as such - flow is more important. After a weekend doing nowt, the pump on mine click 4 or 5 times and bowls are full for running. From empty you'll get maybe 20 rapid clicks and its done! Is the choke connected - have you tried it?

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    Re: Zx9 carb issue

    Got the pump and supply sorted there was a bung pushed really far into the fuel supply that we didn't see. We now have fuel and oil pressure which was my main concern. Had the car almost running but the back 2 carbs seem to be flooding the engine.

    The plugs are wet through and there is fuel coming out of the breather on top like a hose. You can also feel fuel splashing out of the carb where it draws air in too. Is there anything that can cause both of these to do this or do they have the same issue coincidentally. I have no idea with carbs so want to just get an idea before I remove them to strip.

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    Re: Zx9 carb issue

    Float valves !

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    Re: Zx9 carb issue

    Stuck ? Is it a big job to do. What's the problem with them do they need cleaning or replacing ?

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    Re: Zx9 carb issue

    Could this of been anything from when they were stripped and modified to run on a car

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    Re: Zx9 carb issue

    Unlikely - bike carb float valves are moderately delicate and have a finite life in use but if its just a couple of carbs its likely dirt so a clean might help. Easy enough to do with a bit of TLC - take the float bowls off and all will be revealed. Replacements, if required, aren't cheap though......bike stuff never is! If you have access to an ultrasonic cleaner it wouldn't hurt to use it!

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    Re: Zx9 carb issue

    Stripped the 2 at fault down and couldn't really see much, no real rubbish in the valves, possibly a tiny bit could this be the problem ?Click image for larger version Name:	GetFileAttachment-41.jpg Views:	50 Size:	9.0 KB ID:	81361
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    I wouldn't even really say it was debris. There was a feint mark in the valves where the needle had been resting like a water mark. Does everything else look OK?

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    Re: Zx9 carb issue

    They've been sitting around with old fuel in / dried out - the powdery green shite is a give away - they need a damn good clean cos if its on the outside, it will be in the jets and other orifices as well!

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    Re: Zx9 carb issue

    Would the best way to clean then just be with carb cleaner ? What's the actual part that will be causing it to just flood fuel through tho ?

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    Re: Zx9 carb issue

    The best way is ultrasonic cleaning, you'd be surprised what crap comes out of them.

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    Re: Zx9 carb issue

    I don't have that luxury unfortunately. Probably just clean it out best I can with carb cleaner. Strip them al down to check and retry it

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    Re: Zx9 carb issue

    Ok a quick update on this. got the car running after taking the carbs apart. it turns out I need to use the choke. Fault with cylinder 4 carb where its like it almost backfires intermittently. sounds like it draws air in for a split second and then a slight pop like its misfiring. Plugs and timing etc are all ok so not really sure where to go with this now.

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    Re: Zx9 carb issue

    makes sense, you wont start something on bike carbs without choke, bikes included.
    no 4 could be a bit lean, if its only doing it at idle unwind the mixture screw a bit

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    Re: Zx9 carb issue

    Doing it at all revs, wRm and cold, will be OK for a few seconds and then it might do it a few times, then for a different period of time it will be OK and then it happens again

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