This thread has been renamed to reflect the evolving subject of this thread. As usual, the more updated/evolved info is later on in the thread. At first I was only interested in the minor differences between the 250/300 and 125 clutches, but then I realized I could capture a good portion of the info on this new and VERY good clutch from early 2017 production then into later 2017 production. The 2018 production bikes will have the factory's small tweaks from 2017 plus one or more other small changes. The vast majority of you will like your clutches as they come. A few might want to tweak them because like me you are technogeeks. This info is for you, or the just plain curious. This thread is a continuation of a previous thread: http://advrider.com/index.php?threads/the-2017-sherco-scorpa-clutch-a-big-change.1176484/ The 2017 Sherco-Scorpa clutch is fantastic! It's Sherco's version of the diaphragm-spring-type clutches the majority number of manufacturers now have: GasGas, Ossa, JTG, TRS, Vertigo, and now Sherco-Scorpa. If you adore your clutch just ride your bike and enjoy it. If you have any desire to tweak your clutch behavior, and you are technically competent to do so, here is some helpful info. The only repeat complaint I've heard about the new clutch regards lever pull force. Some think it a bit high. For example, me. I adore the clutches on both my 2017 Sherco Factory 125 and 250. The 125 I like a little better, however, because the lever pull is easier, as in very similar to the clutch in the Stu Preston-modified 2014 GasGas Replica 300 I had. I wanted the same feel for my Factory 250, and achieved it. If you wish to do the same for your Sherco-Scorpa, 2017 and later, there are two parts you can buy from RYP or your local Sherco-Scorpa dealer. These are discounted heavily by RYP to not dissuade riders from achieving their clutch behavior preferences. Precharge or Preload Ring A Sherco exclusive. This part sits between the spring and pressure plate, and comes in two versions: 6351 (1.2mm thick - more preload) 6680 (1.0mm thick - less preload) For you non-metric folk that's a thickness difference of only 0.008" FYI, my Factory 125 and 250 both have the 1.0, thinner 6680 ring. Measure yours to see which one you have before ordering a stiffer or softer option. Spring Retainer Plates There are potentially four versions under two part numbers. Part Number 6899, More Preload: - earliest production version, no additional material removed from the step cut - current production version, less preload than early production Part Number 6343, Less Preload: - earliest production version - current production version, less preload than early production For practical purposes ignore early or late production and order by part numbers. My two bikes came with the current production 6899 on the 250 and the current production 6343 on the 125. Here's how I measured mine: Considering the two spring retainer plate and two preload ring options, you have a bandwidth of 0.46mm (.018") of preload to play with to tweak the clutch. Compared to whatever configuration you have: Less preload will lower lever force noticeably and reduce engagement speed slightly. More preload will increase lever force noticeably and quicken engagement slightly. More photos, vids, and background discussion: The 250's clutch being actuated by the clutch lever. The video starts with the lever pulled in, then out, in, out: Because of the lever plates, diaphragm clutch pressure plates move very little, much less than conventional clutches, but the much smaller slave cylinders make the lever plate tips move a lot. Put an older, larger slave cylinder on the new clutch and it will hardly disengage. The single diaphragm (Belleville) spring requires very little preload to achieve a high clamping force. The force ramps up quickly. The system is very spring-preload sensitive, with very small changes in preload have a big effects. In my hand is a spring retainer plate turned edge-on so you can see the step cut and the back side: The glint on the step cut is from the oxide being removed by the secondary operation by Sherco to take more material off to reduce preload overt he original design. Given the reduced preload on the 250, I have had zero issues with clutch slip in any gear and under heavy loads with the softest configuration. The softest configuration is probably fine for most 300 riders too. Always keep in mind bike individuality. In the bell curve of manufacturing variability your individual bike could have softer or stiffer lever pull depending on how all the normal parts tolerance variances sum up. Take care with the ten T20 Torx-socket stainless M4 flat-head cap screws. Progressively tighten them until true full bottoming, which can be hard to feel due to the spring being preloaded. Never impact them tight (OK to impact when loosening). Don't over tighten them by hand or they will get stuck. The new clutch has oil volume spec of 700cc, more than before. If you run the old go-to spec of 450cc, the clutch can shudder while gently slipping it at low RPM. Use only a light purpose formulated gear lube like Maxima MTL 75. Thicker oils or oils lacking clutch additives can make diaphragm clutches drag.