Greetings All, I am a missionary in Cambodia and just sold my 1986 XL600R and my XR400R which I use for mission trips into the jungles and bought a 2003 XR650L. I was pretty dissapointed as my old XL600 ran better than this. The XR650L has been desmogged, new air filter , snorkle off etc but still ran badly. Well I discovered Daves Carb Mods for this. Being in Cambodia it is very hard to find parts and it is too expensive to have them posted so I had a friend coming out from South Africa bring me the recommended jets. 55/158. Well it was with a bit of hesitancy that I started this as if it did not work I was up the creek without a paddel. Well when I finished I read and re-read the instructions just to make sure that I had done it right as it was so easy. It fired up first time and all I can say is WOW. What a difference almost as tourqey as my XR400R was. I am most impressed and grateful to Dave. Thanks Dave. (Must admit the change in sprockets also made a huge difference 48 rear and 14 front). Happy and safe riding and God Bless to all.