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Message: <blockquote data-quote="indyjones" data-source="post: 93104"><p>i have a 1/8" X 1/2" (single speed chain) on a 4 stroke/grubeeII and it has worked well.  The chain tensioner plays a very big part in getting this chain to work..It must be setup perfectly to work correctly, there is no margin for error in guiding the chain on the sprocket.  They do stretch but not nearly as much as the .415...If you do use a 415 on the 4 stroke kit, be sure that the master link is on the right side (away from the drive sprocket) or the clip will come off, and believe me you'll never find it if it does.</p></blockquote><p></p>