I swapped the top end off my 94 (which ran great) on to my 04 this weekend. I moved everything with it, pipe (Toomey), carb (PWK 28), reeds. The only change was I used a clamp on filter with a short tube (4-6 in) instead of my modded stock airtube and UNI,
All logic says this should have been bolt-on and go, but I had no top end. After trying everthing else I decided it had to be jetting, specifically main jet since the low was right there.
Again, logic says if you put on a high flowing intake, it should go lean, so I went up and that made it worse. Long, agonizing story short, I ended up dropping from a 158 to a 135 (!) and it runs great. The other puzzling thing is that it was cold, about 40, and that should have required more fuel too.
Anyone else had this experience going from the stock airtube to a clamp-on? It doesn't make any sense. The only thing I can think of is that the different length of plenum makes a big diff on air scavenging.
All logic says this should have been bolt-on and go, but I had no top end. After trying everthing else I decided it had to be jetting, specifically main jet since the low was right there.
Again, logic says if you put on a high flowing intake, it should go lean, so I went up and that made it worse. Long, agonizing story short, I ended up dropping from a 158 to a 135 (!) and it runs great. The other puzzling thing is that it was cold, about 40, and that should have required more fuel too.
Anyone else had this experience going from the stock airtube to a clamp-on? It doesn't make any sense. The only thing I can think of is that the different length of plenum makes a big diff on air scavenging.