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Post by builditright on Jul 30, 2011 16:08:12 GMT -5
I have a 50cc 4st with about 700 miles on it. I got a good deal on it so you know how that is I had to get it. I drove it home after putting a new fuel valve on it.
When I got close to home it started to flood out. I limped it home and since then here is what I have done.
New fuel valve, two (2) new carbs checked timing and valve adjustment, float adjustment on one carb also float needle. I just cacnnot seem to figure out why it keeps flooding the carbs. It runs great when it is not doing this.
Any help would be greatly appreciated.
Thanks
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Post by Fox on Jul 30, 2011 16:45:27 GMT -5
Sometimes a bad CDI or stator will act like a carb issue. They run okay for a few and then once they get hot they start crapping out.
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Post by builditright on Jul 30, 2011 18:51:47 GMT -5
Fox , no I have ruled out everyting but the carb. IE taking off the vacum line and it runs great after the extra fuel gets out of the bowl. Thanks
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Post by Fox on Jul 30, 2011 19:17:35 GMT -5
Well, nothing else to do but keep lowering the float height I guess. :dunno:
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Post by jmkjr72 on Jul 30, 2011 19:29:45 GMT -5
well i would start by makeing sure you dont have leaky floats all it takes is a tiny hole and a tiny bit of gas for a float to hang low and not shut fuel off when the bowl is full
then i would check to make sure the float needle and seat are clean and in good shape
and before setting the float height i perosnaly would put it on the scoot with out the bowl on
hook up the fuel line and turn the fuel on and make sure the needle is working by manualy operating the float
then i would pull it back off doulbe check for smooth operation of the float and set the height and keep adjusting till it works right
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Post by Fox on Jul 30, 2011 19:39:15 GMT -5
You can tell how high the fuel level is by attaching a clear tube to the drain and then with the tube running up from the drain above the carb you fill the bowl. The tube will fill up to the same level as the bowl.  |
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Post by builditright on Jul 30, 2011 22:28:15 GMT -5
ok I will try that on the first carb that was originally on the scoot. I tried two (2) new carbs on the same scoot but that was still the same, CARB STILL FLOODING. I am at my wits end with this thing. I have never had a scooter act this way. If I did not know better I would sware it was blowing gas out of the fuel valve so the float needle could not hold.
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Post by jmkjr72 on Jul 30, 2011 22:32:44 GMT -5
as long as you dont have a pump there is no way it should get past a good needle and seat
the thing is on my old ford tractor with an updraft carb and the rusty old tank i am either haveing the clean the carb (getting the crap off the needle seat or blowing the rust out of the fuel line)
if you think for some reason your tank us building preasure try running with the gas cap off to see what happens
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Post by builditright on Jul 30, 2011 23:44:52 GMT -5
thats the thing, I have done that and everything else I could possibly think of but still it keeps flooding it.
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 31, 2011 1:46:56 GMT -5
I agree with whoever said it could be a cdi... my wifes was doin the same thing.. i replaced it and it hasnt had a problem sense... there is simply no way for the carb to be flooding if the float checks out ok and your not having starting issues. If you have your old non performance one just try putting it in for a while see if it makes a difference. or buy one they are 7 bucks on ebay.
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Post by builditright on Jul 31, 2011 6:55:27 GMT -5
Tried the new CDI no change.
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tango
Scoot Enthusiast
Ad agendum semper parati
Posts: 389
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Post by tango on Jul 31, 2011 7:50:56 GMT -5
What about the spark plug? Is it really any good? Not because you see a spark coming from it when you look at it outside the engine means that the spark is strong enough to withstand the pressures of the combustion chamber.
Are we certain that the plug is getting proper current from the coil? I was working on a 150cc 4 stroke the other day and it turned out that one if the wires going from the CDI to the coil was frayed. A quick splice and that solved the matter. It certainly looked to be a flooding issue (especially since I had just correcetd a flooding issue: a bit of dirt was clogging the float valve).
What about the spark plug gap? If the gap is too wide or to close it can cause a plug to not fire correctly for that application.
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Post by builditright on Jul 31, 2011 7:59:59 GMT -5
Ok, all that is fine. The scooter starts right up. It will run but when I give it throttle it has no power. If I take off the vacum hose and let it run it will pick right up when it runs the excess gas out of the bowl.
I have tried two (2) other BRAND NEW Walbro carbs that are a known good carb. It does the same thing. It is all fuel related I have ruled that with checking everything else out. I just cannot figure out why it keeps flooding the carb.
And I do appreciate all your help guys.
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Post by Fox on Jul 31, 2011 10:08:55 GMT -5
Have you tried lowering the carb needle by raising the clip to lean out the mixture a little?
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theo547
Scoot Enthusiast
Posts: 497
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Post by theo547 on Jul 31, 2011 11:25:24 GMT -5
dont know how this could happen but have you checked the inlet to the manifold made sure thats clear?
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