Question about 2003 Yamaha YZ 125
You bored it and jetted the carb,but did you adjust the timing to compensate for the extra fuel and compression? if not that is the first step,Just back it up about 3 degrees ,Then you should unhook the self oiler if it's still hooked up and make you a gallon or so of 30:1 mix and see how that works.
Also you should check and make sure you installed the jets correctly
Posted on Jul 22, 2009
Put the orignal air box on it and the problem will disappear, trust me on this.
Posted on Jul 21, 2009
There are a couple things to try, first ensure that the height setting on the needle is set to appropiate level most needles have three or four grooves that you can set the c-clip at to attain the desired affect, just remember to note where you started before pulling the needle throttle piston assembly out and resetting, it sounds like the needle is sitting too low so set the c-clip down a notch this will raise up the needle and provide fuel earlier when the throttle is applied. I hope this helps. Good luck
Posted on Jul 19, 2009
There are three things wrong, oil mix being the primary problem and your not running a hot enough plug for the new fuel mix. try a ac two steps up and you will solve your problem, lean it out just to were it turns brown and it should get it on. the other thing is air flow put a K&M filter on it to get more HP out of it. If your operating at above 5000 feet jet down, want he right size jets just send me an answer to this problem and I will fix you up.
Posted on Jul 18, 2009
Very simple,your combustion chamber is not getting enough fuel to burn and dies out as too much air is coming in. There are 2 ways to solve this :
- either put back the filter, hence less air, balance petrol
- or you need to increase the flow of petrol going in, either move up the needle(if it has one) or you need to go up the copper like screw that allows petrol to jet into the combustion chamber.
Posted on Jul 18, 2009
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Posted on Jan 02, 2017
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