Jetting the carb
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Hey, guys im new.
I just got a yamaha dt125x from 2006, with a custom exhaust from romeu Henriquez. My question is wich jets i should buy for this exhaust? The bike is stock except i changed the reed valves to carbon ones en putted a spacer on the intake. Hope you guys can help me out
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Unless required, I'd leave the jetting alone.
Even DEP recommend just leaving the jetting alone.
Once you get the pipe, warm the bike up and do a plug chop. If it's hesitant, bogging or the plug is not golden brown, then consider a rejet.
If you're running the stock DTX carb, then 210 is the stock jet. The earlier models came with 240 main jet.
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@calum thanks for your reply. Stock jets are indeed present, main is 210 en idle is 17.5. my carb is a mikuni tm28ss. Bike bas bogging(buuhhh sound) if i twisted the throttle while idling when it was warm
@Elan-n Have you done a full carb clean including the emulsion tube?
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@calum @hotshot-iii yes i did a full carb clean, took everything apart and cleaned it and i dont know, the seller told me it drives good and gave the original exhaust with the bike too. I also ordered an fully overhauled carb to replace it. Came in today and dontacted the seller from the exhaust and told me to use a 245 jet but havent tried it yet. Tomorrow im gonna install everything back
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You should get a set of main jets and go up in size significantly until it runs too rich, then start going down until you find the sweet spot. You might need to raise the needle too if it bogs when you twist the throttle. You will probably notice problems when running abt half throttle if the needle is wrong. Keep an eye on the plug when you are jetting, if you have some experience in jetting, the feel and sound of the engine will tell you when you are close. I sometimes use Chinese jet kits and think they work ok, especially for the price, but you can't compare the numbering on them with anything else, you have to stay with that kit when you are jetting.
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