I just picked up a low hour 17 TX300. The previous owner bought a Lectron 38 (non HV) from Slavens as soon as he got it, It came with the 2-3xl metering rod, and he could never get any bottom end out of it (at 1000' ASL). He ended up never really riding it (only 10hrs) and sold it to me a year later with the Mikuni w/jd kit installed, but included the Lectron in the sale. I haven't had a chance to get a real ride on the bike as it sits with the JD\Mikuni yet, but it feels fine going up and down the road. (I know that's no test). I called Lectron and they will do the HV mod and set it up with the 5-1 metering rod for ~$100 including shipping. My question is if I do try the Lectron do I need the HV mod? what exactly does the "High Velocity" give you? I'm a slow rocky technical single track rider and would want low end torque over high rpm power. all of our stuff is slow and tight and I like to lug vs being on the pipe.