cbrxxquad Posted November 25, 2013 Share Posted November 25, 2013 New Transmission Friction Damper In an effort to minimize the annoying ‘clunk’ of metal against metal that often occurs when motorcycles are shifted into gear from neutral at stop, particularly in cold conditions, the CBR1100XX’s engineers developed a simple yet effective new damping system that softens the jolt. Mounted on the transmission’s main shaft, this hard rubber ‘friction’ damper quickly slows the spinning main shaft when the clutch is pulled in to reduce the difference in speed between it and the stopped countershaft, thus reducing the shock to the gears on the two shafts as they mate, and significantly reducing the resulting ‘clunk.’ maybe the bearing seal....going to have to go look at one and spin it... Quote Link to comment Share on other sites More sharing options...
superhawk996 Posted November 25, 2013 Author Share Posted November 25, 2013 Ran an automotive 20-50w in my FZR 1000 and immediately got the symptoms you describe. Back to the Rotella 15-40w and immediately gone. I have read that the diesel grades have a zinc compound that is good for the wet clutch design. I run it in all my bikes now. I think the zinc & phosphorous is gone due to EPA, poisons catalysts. Diesel oil used to be the cheap way to get Z&P way back when it got removed from standard gas automotive oils. The zinc's main advantage is on metal to metal contact like cam followers, but may have also played a role in the clutch. Being that modern bikes have catalytic converters I'm guessing the zinc is gone or at least highly reduced in standard use bike oils too, dunno for sure. The only oil I know for sure that's got it and is somewhat easy to find is Valvoline racing oil in the 'not street legal' version. If it doesn't state not street legal or it has a modern rating it doesn't have the Z&P levels of old oils. There are a few others like Brad Penn oil that have it too. There are several additives with zinc, but the effectiveness of it mixed with modern oil has mixed reviews. The modern oils have different shit that's supposed to do what Z&P did, but it's been shown to not have the same effect. Like most products, if the bottle doesn't have a skull & crossbones warning, it doesn't work for shit. Quote Link to comment Share on other sites More sharing options...
EVLXX Posted November 30, 2013 Share Posted November 30, 2013 Mobil 1 still has high levels of Z & P. 1376 ppm Z and 1223 ppm P Quote Link to comment Share on other sites More sharing options...
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