I've really enjoyed the total inertia of my Sherco 250s without added flywheel weights. On the 300s no question. I add weight, but on the 250s I have been skeptical the last two years. As part of thinking about nationals prep I thought why not get the S3 weight for the Sherco? It's easy enough to take off for an altitude event and put on for low altitude or slick conditions, increasing flexibility for varying conditions. Test results were a little unexpected (read on...) I fit S3 FW-SH-12 "Flywheel Weight inertie Sherco 2012" to my Hidria flywheel. Here are the two parts being clear spray lacquered: I found the two black oxide coated steel M6 dodads for the two M6 flat head cap screws were not a press fit into the flywheel holes, so I bonded them in with aluminum epoxy. That way they will not back into the stator when I remove the weight without removing the flywheel. Lots of delicate stuff here: Here are the dodads in place on the inside: Riding the bike, I expected the throttle response to be noticeably delayed coming on and going off. Oddly, that was barely noticeable and I reprogrammed to the slight change in timing inside if a minute. The 250 Sherco is perky without added flywheel weight, and with added flywheel weight is still perky. Adding to total inertia has been a positive change, as in the bike is a little more controlled in the rough. A gnarly rocky uphill line by the house requires lifting and placing the front wheel in a series of floater turns. I had more difficulty cleaning it before the change. Another positive has been that dumping power into the clutch does not require as much precision, increasing confidence. So there it is. I was wrong in my assumptions. ...Regarding added flywheel weight and 250s, at least the Sherco-Scorpa 250s. You can have too much total inertia (think stock TY350), but that is definitely not the case with the S3 weight on Sherco-Scorpa. Not sure yet about keeping the weight on above 5,000 feet, but otherwise, yes, it's definitely a keeper. What are your experiences adding weight -or not - to your 250s?