Jetting and Needle question
Posted: 12:13 pm Dec 20 2018
I am sure this has been discussed so please feel free to point me in the right direction. I recently picked up a 2004 KDX 220 and I am really enjoying working on it. The carb, jetting, rich, lean is all new to me and I appreciate learning more about it but again I am very new.
The previous owner lived at sea level (bay area, CA) and had a 160 main jet, 42 pilot jet and the needle clip in the middle. I haven't heard of this set up before, or at least a 160 main. I've notice it runs choppy and rough in 1st and 2nd at low/mid rpm and the power band smooth's out a lot in 3rd gear. I mistakenly moved the needle position down one position (I was thinking the opposite of what I should have done) and it made it worse last weekend. A little more boggy and an inconsistent hit when it came on which happened at inopportune times... I have since moved it back to the middle but think I try one position up to lean it out a bit. Am I thinking about this correct? I am thinking some responses might include, "try it then try something else if not". I get it, it's trial and error but I wanted to see if It made sense to start there then maybe change the jetting one at a time.
I have a Pro Circuit Platinum 2 pipe, FMF TurbineCore 2 silencer, Vforce3 reed (they're fine, I checked), air box lid removed, 32:1 pre mix and stock 33mm carb.
Thank you for any help or guidance. Cheers!
The previous owner lived at sea level (bay area, CA) and had a 160 main jet, 42 pilot jet and the needle clip in the middle. I haven't heard of this set up before, or at least a 160 main. I've notice it runs choppy and rough in 1st and 2nd at low/mid rpm and the power band smooth's out a lot in 3rd gear. I mistakenly moved the needle position down one position (I was thinking the opposite of what I should have done) and it made it worse last weekend. A little more boggy and an inconsistent hit when it came on which happened at inopportune times... I have since moved it back to the middle but think I try one position up to lean it out a bit. Am I thinking about this correct? I am thinking some responses might include, "try it then try something else if not". I get it, it's trial and error but I wanted to see if It made sense to start there then maybe change the jetting one at a time.
I have a Pro Circuit Platinum 2 pipe, FMF TurbineCore 2 silencer, Vforce3 reed (they're fine, I checked), air box lid removed, 32:1 pre mix and stock 33mm carb.
Thank you for any help or guidance. Cheers!