That grooving and stuff Don’t really matter That much, yeah you get more oil Gas mix Cushion but your jetting will change and you could lose power for optimum power you need optimum jetting with crisp clean jetting throughout the range,
if you’re going to compromise jetting that then you’ll have a turd slow bike!
What you need to you have to have a retarding timing Ignition for an air cooled 2 cycle high rpm engine and of course for the higher RPMs water cooled is best
Back in the day 60s-70s enduro and dirt bikes only revved like 8,000 RPM so you could run almost any timing you wanted and they didn’t seize
Timing first then jetting, if you’re planning to run more than 8,500- 9000 RPM then you’re gonna have to be able to retard to 12° Or less, If you’re running static timing/points ignition you can’t start off with low timing like 12° that unless you’re going downhill, 14-4.5° is about the lowest you could go to have any kind of takeoff!
So don’t run super high rpm set up And pipe if you can’t run a retarding ignition!
Man I can’t believe how people (I wanted to say stupid people) just keep posting this seizing stuff it blows my mind,
Learn to time/tune within rpm limits of your ignition and you won’t seize.