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post #1 of 17 (permalink) Old 04-15-2013, 12:33 AM Thread Starter
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zuma issues

just got my 99 zuma running but it still will bog down as if it wants to die when given full throttle, then after like two seconds it picks back up, I also noticed that when i turn it off there is gas leaking from the carb. Im guessing it needs the float but before i go tearing it apart id like to be sure. Any advice helps, thanks in advance
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post #2 of 17 (permalink) Old 04-15-2013, 05:57 AM
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Clean the jets while you are in the carb. Unscrew the jet, run some thin wire through the hole, follow up with some carb cleaner. A fresh spark plug is also in order.
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post #3 of 17 (permalink) Old 04-15-2013, 06:59 AM
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'99? I'd suggestion a top end rebuild too, chances are it hasn't been done in a while, it is a two stroke after all

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post #4 of 17 (permalink) Old 04-15-2013, 12:59 PM
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the vacuum activated petcock is no longer shutting off the fuel flow to the carb as well.

bogging is due to the carb being dirty

how many miles are on it?
Im at 9k with my '04 and the engine still pulls well enough to get me around at 40mph and Ive never touched the engine.

-Jason
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post #5 of 17 (permalink) Old 04-15-2013, 02:14 PM
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^^^^

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post #6 of 17 (permalink) Old 04-16-2013, 06:30 PM Thread Starter
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thanks for the hep guys, I got about 4k on it, i have only owned it for about 300 miles. I put the brand new spark plug in it Saturday and it did help. I will pull the carb off tonight and look whats going on in there. As far as a top end rebuild I am putting that off as long as possible till I decide to do a 70cc kit. As for the vacuum petcock how do i go about fixing that.. . Replace the petcock?
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post #7 of 17 (permalink) Old 04-17-2013, 12:28 AM
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Before you go tearing into the carb... Just a thought, but is the air intake modified in any way? Like the filter removed? Intake snorkle opened up( there's a rubber collar that fits in the intake snorkle that reduces its diameter, the zuma runs like crap without that little piece..

-Jason
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post #8 of 17 (permalink) Old 05-15-2013, 04:31 PM Thread Starter
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So I started messing with the zuma again and now it does not start. Is is necessary to get a new petcock to have it run? Also are my jets soppost to be screwed out a certain number of turns? How many turns out should the 2 adjustments be on the side of the carb?
Thanks
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post #9 of 17 (permalink) Old 05-16-2013, 04:24 PM
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if the petcock doesnt open and allow fuel to flow then yes its necessary, and it loks like from the parts diagram, the petcock isnt repairable youd have to replace it.
check to make sure the vacuum line is intact and sealed and that the hoses are hooked up to the correct ports on the petcock.

as for the jets (i think you mean needles?) id have to check my manual for that answer

-Jason
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post #10 of 17 (permalink) Old 05-16-2013, 04:40 PM Thread Starter
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it was letting out fuel prior to me pulling the carb off but the petcock does not just flow fuel unless the bike is off, but I am still having the issue of the carb over flowing once the bike is off. I am talking about the jets int the float bowl i know some carbs require them to be turned out a certain # of turns. And I am also curious of the needles.
Thanks
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post #11 of 17 (permalink) Old 07-05-2013, 12:24 PM Thread Starter
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I know this is a very old thread but i cant seem to stop my carb from leaking out of the overflow. I got a new carb float and needle valve, along with a new petcock and it is still leaking after shutdown and while running. I have read somewhere there is a little o-ring for the needle valve. I cannot seem to find that part, any help would be great since I cannot seem to join zumaforums without knowing who the lead administrators are. I have been driving it as it but im getting pretty bad mileage since im pissing gas everywhere

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post #12 of 17 (permalink) Old 07-05-2013, 12:31 PM
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http://www.dgy.com/OEMpartfinder.htm..._(YW50S_-_2004)

there is no oring for the needle valve, your float/needle isnt shutting off the flow of fuel into the carb. pull it back out and clean out the area where the needle seats with a q-tip and carb cleaner im guessing there is gunk preventing a seal

it shouldnt leak after shutdown the petcock on the fuel tank is vacuum operated and should shut off fuel flow to the carb with the engine off

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post #13 of 17 (permalink) Old 07-05-2013, 12:58 PM Thread Starter
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Thanks for the quick response. That is why its really confusing me, its a brand new oem genuine petcock, hopefully it isn't defective. But i will get to cleaning now and see where that takes me. If this thing wasn't so fun id just sell it as is. I may try an inline fuel filter.
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post #14 of 17 (permalink) Old 07-05-2013, 04:24 PM
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a fuel filter isnt gonna have any influence on your problem of the carb overflowing,

look at the carb even without the petcock, it shouldnt overflow

-Jason
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post #15 of 17 (permalink) Old 07-05-2013, 04:53 PM

 
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only a guess here, did you install the seat upside down?

Is it a float style carb? If so, check that the float is not defective.

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post #16 of 17 (permalink) Old 07-07-2013, 08:13 AM Thread Starter
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No it was all installed correctly, but I did the cotton swab in the needle valve seat and also replace an iffy looking hose and now it does not leak a drop so im not sure what realoly fixed it. Thanks.
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post #17 of 17 (permalink) Old 07-07-2013, 03:09 PM
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good to hear

-Jason
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