Thats the junk Mikuni TMX carbs for ya.
I bought a 2003 rolling chassis last year and did a liquid 440 drop in. Mine is now completly trailable and is scarey quick. It can be drove by my lady all day long and does not load up.
I tossed the TMX carbs and replaced with 34Vm roundslides.
my chassis already had the larger tank and my engine had the trail head.
I used electrics (stator and cdi)off a 1998 XCR440 (I junked the timing switch and the 2 solenoids)
I used the harness off the same sled.
My engine was a 2000 xc440 sp so its the same basic engine (small block mouse motor)
Jetting and clutching was just as a 1998 XCR 440 would be set up.
The hardest thing I ran into was the pipe. My 440 cylinders(1999 edge style sled and 2000) have 4 bolts on each side that bolt the y-pipe on.(8 total not 6) So when I bought a prox 440 pipe set up I could not use the y-pipe. And my stock one would hit the shock brace. I had to cut and reweld the y-pipe at a different angle to use. It turned out nice and looks good.
I am not saying you need to do all of this by no means. Also your low end bog my be a simple fix. I have seen people all over the net pi$$ed off at the tunability (or lack of) of the TMX carbs. Just my 2 cents and a idea of worked for me to make an awesome trail sled and ditch banger.
