carb draining from bottom drain hole - Suzuki Z400 Forum : Z400 Forums
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post #1 of 18 (permalink) Old 03-04-2011, 05:39 PM Thread Starter
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carb draining from bottom drain hole

so i just got a call from my dad saying my z is leaking gas over out of the bottom of the carb drain hole while just sitting there. Im not home but im wondering, shouldnt that screw be tight to prevent that from happening?? Im hoping its just as simple as tightening the thing. Just wanna check
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post #2 of 18 (permalink) Old 03-04-2011, 05:52 PM
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needle and seat is bypassing...need to be cleaned out or replaced. same thing happened to mine

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post #3 of 18 (permalink) Old 03-04-2011, 09:53 PM
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Yep, the screw is a drain, but if the carb overflows from a faulty needle valve, it will let the fuel out of that tube.

You will want to change your oil as well, because most of the time when this happens, a bunch of gas ends up in the oil as well.

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post #4 of 18 (permalink) Old 03-04-2011, 10:33 PM
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Both my z's have had this issue. It was the o-ring on the needle valve both time. Went to Ace Hardware and found the right size o-ring and it worked both times.
It's the crappy gas and the mtbe (no longer allowed in CA).

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post #5 of 18 (permalink) Old 03-04-2011, 11:29 PM
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if i remember right i used an oring from work...part number ms28778-3 or -4 i think. you might be able to take that number and have it cross referenced

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post #6 of 18 (permalink) Old 03-05-2011, 12:21 AM Thread Starter
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well it just so happens i have some older carbs that never had that problem, Ill tear them open and see if they have better orings. I forgot to mention it IS running good.

Ill try and find a mach at lowes or something if those dont work.

thanks for the help guys
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post #7 of 18 (permalink) Old 03-05-2011, 05:09 PM Thread Starter
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well i switched needles and seats with my other carb, get it back together and it seems to be doing the same thing. Except now im noticing smoke coming from the pipes when i get on the throttle hard. It looks black/blue....
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post #8 of 18 (permalink) Old 03-05-2011, 05:12 PM Thread Starter
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could this be from gas getting in the oil???
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post #9 of 18 (permalink) Old 03-05-2011, 05:18 PM
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Make sure you don't have the carb on PRI setting and leaving it that way.

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post #10 of 18 (permalink) Old 03-05-2011, 05:26 PM Thread Starter
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I dont, in fact i just disconnected the tank while its sitting.

My main concern is if ill have to rebuild the WooterWooterWooterWooterin topend for the 3rd time
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post #11 of 18 (permalink) Old 03-05-2011, 06:02 PM
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If the carb is still overflowing it's not going to run properly until you fix the problem. Get a new needle valve, with a new o-ring and be done with it.

If you keep running it this way, yeah, it will take it's toll on the top end, and yes, you should change the oil once the problem is fixed. Gasoline is not a good lubricant.

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post #12 of 18 (permalink) Old 03-05-2011, 06:14 PM Thread Starter
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Quote:
Originally Posted by CFM-Z440 View Post
If the carb is still overflowing it's not going to run properly until you fix the problem. Get a new needle valve, with a new o-ring and be done with it.

If you keep running it this way, yeah, it will take it's toll on the top end, and yes, you should change the oil once the problem is fixed. Gasoline is not a good lubricant.
Well i already took them off an older carb that had never done this and had the same results. I keep the petcock in the ON position and it is still dripping but its only after i shut the quad off.

I bought this quad last year and have literally ridden it once. My frustration level with the POS is sky high
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post #13 of 18 (permalink) Old 03-05-2011, 06:27 PM
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Quote:
Originally Posted by mdmitchell2 View Post
Well i already took them off an older carb that had never done this and had the same results. I keep the petcock in the ON position and it is still dripping but its only after i shut the quad off.

I bought this quad last year and have literally ridden it once. My frustration level with the POS is sky high
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post #14 of 18 (permalink) Old 03-05-2011, 06:43 PM
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Most of the time it's not the Pos's fault, its the guy caring for it.

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Custom Web Cams, with adjustable sprockets,
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HSR45 carb, Custom intake,
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post #15 of 18 (permalink) Old 03-05-2011, 06:49 PM Thread Starter
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Quote:
Originally Posted by CFM-Z440 View Post
Most of the time it's not the Pos's fault, its the guy caring for it.
yeah especially when its the 3rd owner and you inherit the problems.
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