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Time has a way of slipping through one's fingers, and it seems 2 complete years have vanished since my last update. In the interim, my journey with the Mikuni HSR carburetors has been nothing short of revelatory. These marvels of engineering have consistently delivered joy with every press of the throttle , I can also I've gathered substantial hands-on experience to report back on their performance. Not long after the install I went back to the dyno with them but need to preface my comments with that I had no complete comprehension of their inner workings , I spent a few hours at the dyno playing with different settings mostly because I did not properly understand the relationship between needle, needle jet and main jet on these carbs . regardless even though most of my runs were done with jetting that was mostly way too rich and realy all over the place the Torque line was surprisingly consistent with what I had with the SU but initially down significantly , power was up and I could now rev better to 6500 . the first few runs we were down almost 13% torque and our best run was still down 5%. Also because we had some very lean spots we kept timing at 34d compared to the 37 I ran with the SU even with all this we still made 172whp up 6hp from before . But performance on the street was Ok since then I spent a lot of time getting to know them better and Through an iterative process of tuning—adjusting needles, pilot jets, and main jets and timing —I've dialed in the carbs to my engine's specific demands. One of the best parts about these carbs is with practice you can change needle position or swap needles completely in 5 minutes on the side of the road with few tools and try a completely different setting on the spot. This meticulous tuning has yielded a power distribution that favors mid-range torque, albeit with a slight trade-off in top-end power. I’ve not gone back to the dyno but Real-world performance is significantly much stronger than when I initially went and seat-of-the-pants feedback suggests a peak horsepower somewhere near 180whp which is 15 more than the Sus, I’m not sure about peak torque but I would also say my average torque probably went from 151 with the Sus to somewhere around 165 ish . However, without a recent dyno confirmation, this is speculative. One thing to note is that they seemed sensitive to engine bay temperature change so a well-crafted heat shield proved essential for maintaining optimal air fuel ratio Also At some point Velocity stacks were added, which, while not increasing power, have provided a consistent air-fuel ratio across various driving conditions and seemed to help towards temp sensitivity Looking forward the focus shifts to a new project: a 3011cc stroker engine. The plan includes testing both 42mm and 45mm Mikuni HSRs to ascertain the optimal carburetor size for this new setup. Based on the experience thus far, the Mikuni HSR carburetors are highly recommended for their exceptional tunability and the overall enhancement in performance they offer, although further testing is on hold as the new engine build takes priority. Sorry again for the delay and hope this helps anyone looking at this Please feel free to reach out if the are any questions J.

Its 6 bolts to take the pressure plate off, and you would have to do that to inspect the clutch disk. The clutch disk is the wear item, so that's what you would need to inspect and make a call on whether to replace it or not. I would at least take it apart and inspect it.