Question about 2003 Yamaha YZ 125
Hi, Customcre8 it is an overflow tube do not plug or attach for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yz 125 overflow leaking Yamaha 2 Stroke
Oakys Garage How to clean overflowing Carb Carburetor Part 2
YAMAHA YZ125 Owner Service Manual
OEM parts for Yamaha
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Posted on Jul 19, 2016
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Posted on Jan 02, 2017
Your bike has mis adjusted carb floats or the float valve is stuck open from dirt and contaminants, you need a carb clean. Avoid riding it while this problem continues. Fuel could be running into the intake, into the cylinder and washing the oil off of the cylinder walls. This removes the lubrication from your engine and will cause bigger problems. Check your oil for fuel.
Posted on Sep 25, 2009
Hello ddsaul2...If it's only been a day since the shop adjusted the carbs. you need to return it to them and make them do it right.
Sounds like a float valve is stuck and not closeing.They may have cracked a seat... There could be a pin hole in one of the floats causeing it to fill up with gas and sink. You can check and make sure all the vacuum lines are connected and possibly GENTLY tap on the carb fuel bowls to see if the float might be stuck alll the way down. Personally...if i paid for a carb tune i'd make them fix it. Surely they gurantee their work.
Good luck...i hope this helps
Posted on May 30, 2009
This is not the news you probably want to hear but backfiring thru the carbs when you have good spark can be one of 2 things... either the valves are sticking / not closing properly due to carbon or the cam timing has shifted from the original position.
It would be best to do a compression test. You should have a minimum of 100 PSIG for an engine with major problems and up to 150 for a healthy engine. If you can not get 100 PSIG then it will be time for some serious engine service.
There is a possibility of the kill switch wire in the handle bar grip grounding under the grip to the handlebar but, since you said you have killer spark I doubt this is your problem.
Thanks for using FixYa.
Posted on Jun 10, 2010
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