Hey, I'm stuffing a CBX e start in my 92 XR250l and having some problems with deciding which is the proper left mainshaft bearing. The OEM bearings for a XR250l come with a seal on one side. The attached pic shows the mainshaft bearing on my XRL with a bearing seal but the CBX bearing has no seal. I am wondering if the CBX has no seal in order to allow lubrication to the e start gear which the XRL doesn't have. Both crankcases have an oil passage on the bottom that allows oil return to the sump. Any comments will be appreciated. Oh right, intro. First bike was a SL100, (bought new), this was my gateway drug to a rebuild of a H1 when I was 16, (blue metalflaked the frame - hey, it was the 70's). Coupla more bikes then a hiatus for 30 years. Picked up a 78 CM400 5 years ago, hey this is fun! Ended up with a XR400 and a ZRX1200. Found the ZRX too inviting in the 200 - 250 kph range and sold it. The XR400 was a beautiful bike but too big and heavy for me in the single track / tight woods we ride. Picked up a xr250L but found kicking it over made me piss blood. Hence the search for an e start conversion. Sourced a CBX bottom end and also had my kidney out, so I can kickstart and not bleed but the estart still seemed like a good idea. Also, still like the street so I've got two GT550's a T500 and a RZ350, (wifes bike) in various states of rebuild. Also have the 2 strokes version of a Thumper, a 76 TS400, but I think my wife wants to upgrade from her TW200 to it. We'll see after she kicks it over though.