Yeah, as I recall this was discussed a while ago. There is a bushing to be replaced, and also a rev limiter wire on the CDI box that gets cut. I took particular interest in it because I was going to pep up my granddaughter's little 50, but she seems satisfied with it the way it is. It's a green wire loop on the 50, and on the 90 it's also a green wire. This one has 2 green wires in the CDI box. Only cut the one going to the 4 wire connector.
Wish I could remember who supplied this info

, to give him credit, but I'm glad I took notes. I also can't say if it's the same for 2 or 4 stroke.
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2004 TBX 400
Marsh Green
2500 Warn Winch
Mrp Front Bumper
Marsh Green Hand Guards
Scabbard & Rack Baskets
Bone Stock Work/Play/Hunting Machine
2008 Thundercat
Front & Rear Bumpers
3000 Warn Winch
ITP SS 212's
26" Bighorns
AC Rear Sway Bar
Black Hand Guards
Blacked out Headlight Covers
2006 Kymco Mongoose 250 (spare ride for friends)
2006 DVX 50
Lime Green
Granddaughter is a Cat Kid