This product evaluation MUST be qualified by the fact that I have modifications to my power plant as follows:
ported 400
increased air intake
39mm carb
torque pipe
For some time I've had a problem hitting the rev limiter when trying to run wide open. I had jetting pretty close and response down nice but it just wouldn't get to the top without sputtering AT the top.
I just replaced my stock CDI with a one of the No Rev Limit CDI's and the benefit was absolutely immediate!!! From the first time I "put the thumb into it" after changing the CDI, it has not sputtered or spit one single time! It will go to WOT and operate steadily to the point that I'm sure speed is at max. I am very pleased with the choice to move to the modified CDI. If you have a modified powerplant and can or do regularly hit the rev limit, this component should be considered. I guess over-rev should then be considered but, as with any performance enhancing change, you should use sound judgement when applying it.
Just for shits and giggles I'll include what air flow and jetting I'm currently using.
dual air intake snorkels - each one 2" dia. with a 5" long x 2 1/4" UNI-Filter universal pod filter and mated Outerwear as pre-filters, UNI-Filter in main air box with no Outwear
Keihin PWK39 carburetor - #160 main jet, #45 pilot jet, DEJ needle with clip in middle position. (honestly can't remember where the air screw is at in turns, will have to check that)