- May 14, 2001
I'm considering a Dell'Orto 38mm pumper carb (PHM) for my 2000 KTM 400 SXC with the older LC4 style engine. Until recently, this carb was available through KTM as it was supplied stock on mid to late 90s 400 LC4 models. My only option now is to get one through an aftermarket supply house for Harleys and other big twins, as the Dell'Orto is a popular improvement for them as well. Question is, what was the hot jetting set-up (I'm at 600 feet elevation) for the 38 pumper on 400 LC4s? The big twin retro Dell'Ortos come jetted too rich for a 400 single. I've looked into the Keihin 39mm pumper, but would have to purposely dent my header pipe to provide clearance to fit, and my understanding is the Dell'Orto was awesome when set up correctly.