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Post by shayne0121 on Feb 12, 2015 17:18:01 GMT -5
Hi all I have a yamaha Neo's 2t 50cc which runs a lot better with choke on? from stand still with the choke off it will gradually build up its speed but when the choke is on your can feel a major difference in power any one know what I can be? thanks in advance  |
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Post by Fox on Feb 12, 2015 20:36:47 GMT -5
Sounds like it's getting too much air or not enough fuel. Does it still have the stock air filter or did you change it to a Uni pod or some other "performance" filter?
Other possible suspects would be:
Cracked vacuum hose somewhere.
Cracked snorkel tube between the air box and carb.
Cracked intake boot between carb and engine if so equipped.
If still running the stock filter and there are no air leaks then I would venture to say the carb is dirty. (jets)
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Post by niz76 on Feb 12, 2015 23:49:33 GMT -5
What Fox said^^^^. The (manual) choke is letting more fuel in when you pull the lever... if it's running better with more fuel- upjet! The two strokes love fuel and oil! lol. It's actually dangerous to be running too lean since the engine relies on the fuel/oil mixture to cool it down...
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Post by shayne0121 on Feb 15, 2015 15:39:05 GMT -5
Thank you for your replys Fou d out there was screws missing for the airbox so it was hangin :/ i secured it with new screws and gave it a go around the block and it was bogging through out the rev range. Pull was shockimg too :/ so i removed the screws so its just hanging again and the power is back now :/ the bike is stock apart from naraku coil, naraku cdi and viper exhaust. Im guessimg it needs a upjet? Also is there a restriction in the carb restricting the air? thanks in advance |
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Post by 90GTVert on Feb 16, 2015 10:59:01 GMT -5
So the air box is not connected to the carb now? You're probably too lean with the air box disconnected and perhaps too rich when it's connected. If you'd like the engine to last you need a filter or air box or some sort. I'd inspect the air box and reinstall it. Then tune the carb.
Was the exhaust just added? Some pipes will kill the low end power and require CVT tuning. If you have that going on along with carb issues everything will be harder to sort out.
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Post by shayne0121 on Feb 16, 2015 14:16:30 GMT -5
Hi Yes the oem air box is connected but there's only 1 screw holding it together instead of 3. does anyone know the stock tuning for the mixture and idle so I can go from there. I brought the bike like this but from as far as I know he's always had the same problem with the choke /: Thanks for your replys |
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Post by Fox on Feb 16, 2015 14:58:10 GMT -5
I am 99.9999% certain you need to check/clean/replace the air filter and completely disassemble the carburetor and clean the entire thing especially the jets. There is an obstruction in there somewhere that is causing it to starve for fuel so you have to run it with the choke on to compensate.
Question: Is there an air filter inside the air filter box or is it empty?
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Post by shayne0121 on Feb 16, 2015 16:11:47 GMT -5
hi fox, yes everything is inside the airfillter as it should be, il strip the carb and clean it out same with the air box, just hope it runs fine after as I need the bike for work  Thanks again for everyone's help!! |
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Post by shayne0121 on Feb 16, 2015 17:13:42 GMT -5
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