DT1 MX project

I got the six engine case bearings, buying them all on ebay. These should be the same for all the '68-'73 DT and RT engines. The main crank bearings are Yamaha part number 93306-30630-00 and are no longer available, so I bought two Nachi 6306 open C3 bearings.


The smaller left side transmission bearing is Yamaha part number 93315-22004-00, and the bigger one is 93306-30506-00. Both are still available from Yamaha, and I went with OEM on these.


The smaller right side transmission bearing is Yamaha part number 93306-20306-00 and is still available, so I got an OEM bearing for this. The single shield larger right side transmission bearing is Yamaha part number 93306-20503-00, and it is no longer available, so I bought an NSK 6205ZC3. For all six bearings it came to about $107 shipped.


I put the bearings in the freezer ahead of time, and all but one of the circlips goes in the cases first. I warmed the cases in the oven to 200 degrees F. It seems like the bigger the bearing the more likely it will just drop right in, and the smaller ones need a little help. I have sockets ready to help drive them in if needed. Be sure to clean the sockets first, especially the inside, since you don't want any grit to fall on the bearings.


I'll be getting ready to assemble the bottom end of the engine.