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Post by sai on May 14, 2015 22:23:55 GMT -5
So today was my first tune up with the mechanic...
after riding the bike for 30 minutes, I can feel it jitter and sputter and finally it just stopped. I tried revving it and using the kick starter, no luck. I cover the air filter and try to start as well as taking the airfilter off completel, no luck.
And then I finally noticed that fuel was dripping from the air filter box... so I took the spark plug out and it was black and wet! It wasn't like this until today after being tuned by the mechanic!
What happened?? I didn't change the main jet nor the needle setting!
I luckily had a new spark plug that's dry and I managed to ride it home...
Did the main jet become too rich all of a sudden??
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Post by Elektrey on May 14, 2015 22:36:02 GMT -5
I would call the mechanic and ask him what he did, I would even take it back and have him fix it.
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Post by sai on May 14, 2015 22:39:53 GMT -5
Well before I left I asked if he did anything to the carb setting, he said he didn't even touch them...
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Post by Fox on May 14, 2015 22:56:27 GMT -5
So what the hell did he do? Nothing else to tune up on a 2 stroke besides the carburetor.
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Post by sai on May 14, 2015 23:06:18 GMT -5
Regardless I need to know if anyone has an idea what's going on..
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Post by Fox on May 14, 2015 23:24:46 GMT -5
Gas dripping from the air filter usually means the float valve in the carburetor bowl isn't shutting off the fuel flow into the carb when it should so the carb overflows and the gas runs into the air box. Tapping on the carburetor with something like a stick or the back end of a screwdriver will sometime free up a stuck float. Other times the reason is there is a small piece of debris in between the float needle and the seat preventing the needle from sealing properly on the seat and usually the only cure for that is to take the carb apart and clean it.
It could also be that a faulty fuel petcock is allowing fuel to pass through the vacuum line that opens the petcock and if that's the case then it will flood the engine as well unless it's equipped with an electric fuel pump in which case there is no vacuum line to the petcock cause there is no petcock.
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Post by sai on May 15, 2015 13:51:34 GMT -5
I checked the floater and it seems to move about just fine when I took the bottom bowl out.
The scooter is a Kymco SUper 8 50cc with complete kit to 70cc exhaust, etc...
1. I had a BR9HS plug and according to the mechanic (brought it back) I am using the wrong one and it's too cold... I should have used a BR8HSA...
2. Also, I went from a 91 jet to 89 just so I can run the bike again.
And frankly, I'm not very happy with the service... I'm opening a new thread asking you guys opinion, specially if any of you have had experience with them.
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Post by 190mech on May 15, 2015 14:14:39 GMT -5
If the "mechanic" changed the inline fuel filter,he could have possibly got some dirt in the fuel line during the change making the float needle stick open..It may flush through,but a carb cleaning would be the best bet..
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Post by sai on May 15, 2015 15:13:53 GMT -5
I'm not sure if he did or not... he said he didn't touch the carburator nor the lines.
I took the carb out and sprayed carb cleaner into it...
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Post by sai on May 15, 2015 19:28:33 GMT -5
So just got the bike back... they said they couldn't find anything wrong with it... they went down a jet and went for a hotter BR8HSA spark plug ...
One thing that's interesting... he said that I should get rid of the oil splitter line that's too thin and have 1 bigger line that goes direct into the crank case... what do you guys think of this?
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Post by 190mech on May 15, 2015 20:16:48 GMT -5
I think Kymco knows how to build a scoot engine..If you are going to mess with the factory designed oil injection system,take it all off and premix it!OR maybe leave it as designed and fix the real problem,,flooding...
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Post by sai on May 15, 2015 21:29:41 GMT -5
The "mechanic" said that he couldn't find anything wrong with it... so now I just have to ride it for a while and see if it flooded again or not.
I can still hear the blubbering sound on the lower end from 0-10mph for some reason despite going down to 89 from 91 main jet and using a hotter spark plug.
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Post by 90GTVert on May 15, 2015 21:50:56 GMT -5
Maybe it was what 190mech said and if the float was adjusted or accidentally adjusted during checks or cleaning it could be causing a rich condition. Maybe they fiddled with the mixture screw?
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Post by sai on May 15, 2015 22:35:33 GMT -5
They said they never touched the carb at all, not even the settings. But then again... I don't really trust them.
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Post by themajekalbum on May 16, 2015 0:28:37 GMT -5
Did they clean and oil your air filter during the "service"? Was it maybe not oiled before? Maybe over/wrong oiled?
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