The inside of the engine on my current CT90 project was badly exposed to the elements because it was left sitting outside without a couple of the engine covers. I decided to pull the engine completely apart and rebuild from the cases up.<\/p>\n
Crankshaft Bearings<\/strong> – I wasn’t sure what bearings were used for the crankshaft because the old bearings were unmarked. I contacted Jack @ DrATV.com<\/a> and he sent me two new bearings. Turns out they are just an open #6305 bearing, that would be available from any industrial supply company. Since Jack had a great price I just got what he had. As for removal, you will need a shop press to remove the crankshaft bearings. Before pressing them off, be sure to mark where the teeth of the timing chain sprocket are lined up on the crankshaft.<\/p>\n Transmission Bearings<\/strong> – The old transmission bearings were marked, so I just ordered an open #6004 for one shaft, and an open #6204 for the other shaft. I’ve purchase from Grainger.com<\/a> in the past and they had just the bearings I needed.<\/p>\n Engine Assembly<\/strong> – All new gaskets and seals were also gotten from Dr. ATV. The parts inside the engine cases are actually quite simple; there are only a couple big pieces. I’ve linked a video below where a couple people did a quick engine assembly at a Tech Day in 2011. If you’re a beginner, just curious, or need a refresher, here you go….
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