Northpole Posted April 20, 2012 Share Posted April 20, 2012 Hi I am new here. Some say kevlar clutch is not good for the Hayabusa engine, I was planning to buy one in my 2006 engine, but now a I am not sure. Many say the original one is the best? I am installing a Busa engine in a Triumph Spitfire Mk3 from 1968 and was thinking it would be a good idea to have a stronger clutch. The weight of the car will be with the Busa engine appr. 1200-1300 lbs . Link to comment Share on other sites More sharing options...
ottocycle Posted April 21, 2012 Share Posted April 21, 2012 I run stock clutch plates and heavy duty springs with no problem. I weigh in at about 1350lbs. all in. Dermot. Link to comment Share on other sites More sharing options...
mca Posted April 22, 2012 Share Posted April 22, 2012 I bought a Locost with 2003 R1 engine. It currently has the stock clutch plates with upgraded Barnett clutch springs. The clutch recently started slipping at higher rpms. The previous owner included an extra set of stock clutch plates that I will be installing soon. I'll keep you posted on how this changes the clutch action. Aaron Link to comment Share on other sites More sharing options...
R1 Seven Posted April 24, 2012 Share Posted April 24, 2012 Aaron, What oil are you currently running in the R1? When I had the car, the clutch would slip when I tried non-motorcycle oils in it. I went with Yamalube exclusively, and it worked flawlessly from then on. Hope this helps, Link to comment Share on other sites More sharing options...
mca Posted April 24, 2012 Share Posted April 24, 2012 Jeff, I'm still running Yamalube in the engine/trans. I had a bit of clutch slip after my first trackday, which prompted me to change the oil. The slip continued after a fresh change of Yamalube and filter. I'm planning to change the 7 clutch plates you included with the spares. Aaron Link to comment Share on other sites More sharing options...
Birkin42 Posted April 25, 2012 Share Posted April 25, 2012 Aaron, When you take the clutch apart, carefully inspect the splines on the hubs that engage both the friction plates and the metal plates. These are usually aluminum and can develop wear easily. Once worn, they can hamper the clutch from fully engaging all clutch plates. Also, check to see if any of the metal plates are burned or warped. If some are and some aren't, it's a likely sign that the hubs are worn. Obviously, if any are burnt or warped, they too need to be replaced. Hope this helps. Jack Link to comment Share on other sites More sharing options...
R1 Seven Posted April 25, 2012 Share Posted April 25, 2012 Aaron, That is a bummer. For reference, I logged around 13 track weekends and a few autocross events on the car on that clutch and Barnett clutch kit. Add however much you have been driving it, and that is how long it lasted. Link to comment Share on other sites More sharing options...
mca Posted April 26, 2012 Share Posted April 26, 2012 Jeff, I figure it's worth replacing the clutch plates. I've added 1 track weekend so far and I'm booking one for next weekend. Seems reasonable to last 14 track weekends. In my normal routine that would last me at least 2-3 years. Aaron Link to comment Share on other sites More sharing options...
mca Posted April 26, 2012 Share Posted April 26, 2012 Jeff, I see that you included 7 OEM Yamaha friction plates in the spares box. In the parts diagrams they show 1 extra plate (listed as "friction plate 2"). Any idea if I need to change this at the same time? I assume it's better to change all plates at once but just thought I'd ask if you knew different. Aaron Link to comment Share on other sites More sharing options...
R1 Seven Posted April 26, 2012 Share Posted April 26, 2012 I'm not sure, honestly. I thought that I ordered them all. Is that one a different part number? Maybe I overlooked it. Link to comment Share on other sites More sharing options...
mca Posted April 26, 2012 Share Posted April 26, 2012 Yes, that one plate is a different part #. No worries, just wanted to make sure I was changing the right stuff. Aaron Link to comment Share on other sites More sharing options...
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