Hello all! I have just finished putting together my new phatmoto all terrain 2023 motorbike together! Woot! Time to feel wind? Nope! It’s troubleshooting time, yeah baby! Turns out, the built in jackshaft directly under the seat post was terribly misaligned. It made the chain rub the back of the clutch housing at the top. Rotating the sprocket by hand, I could feel that there was a lot of resistance and a rumbling vibrational sensation. This led me to conclude the bearings were all torqued up. I hammered the splined axle out of the jackshaft and proved my own theory that the bearing was indeed a failure. There are two, one on each side. The sprocket side bearing was the culprit. The axle seems to be straight by eye. When I got it from factory, you could see the sprocket cambered positively compared to everything else (see picture below). I know I need to replace the bearings with 6203-rs bearings… I can use one of those bearing press tools to accomplish that, but how do I shove that shaft back inside? There are no guides or tutorials that I could find about this. The jackshaft housing looks like a bottom bracket welded under the seat tube…. Please gentlemen, I need your help to shaft these holes without bending my shaft. Should I ram in back in through both bearing with a hammer? Do I install both bearings first? I have no experience, all I can do right now is sit here with my shaft in my hand not knowing what to do with it. Thank you all for any and all advice! Also, is it possible that the bearings alone can cause such misalignment? Because as far as I can tell, the jackshaft axle and housing look straight to the eye….
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