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It's Hot Bike 125,,, hydraulic primary chain tensioner,,, I have one on my bike,,, it's works well, easy install, if it whines you probably have it too tight,,, it's worked well for me, never had to adjust it since the install which is what it's all about. My friend has them on his bikes 120hp 103's and never had a problem. That is a very good price delivered.
I have not installed one, but I do not see why the primary has to be removed (based on the instructions.) I can remove my stock tensioner through the inspection cover.
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