Canonman Posted July 22, 2018 Share Posted July 22, 2018 Hello again, Dears, Anybody check the temperature of the differential housing? Yesterday I traveled about 100km, of which about 40km by motorway with speeds of about 150-200km / h. After then I almost burned off taking off the back wheel. the whole differential was very hot. Central screw also a rim with bearings very warm. Is it normal in this model whether you should already think about replacing the bearings in the differential? Link to comment Share on other sites More sharing options...
footgoose Posted July 22, 2018 Share Posted July 22, 2018 Rear wheel bearings are prone to destruct in some bikes. I check them every time the wheel is off and they have been "notchy" every time. Evidently on some bikes, the axle bearing spacer in the wheel is a bit short. This causes pressure on the inner race of both bearings, and their demise. I hope that is causing your problem because it's an easy fix. Link to comment Share on other sites More sharing options...
thumper Posted July 22, 2018 Share Posted July 22, 2018 Check to see the rear brake is not dragging. 1 Link to comment Share on other sites More sharing options...
docc Posted July 22, 2018 Share Posted July 22, 2018 Checking the brake is good advice. The rear brake can be needy and the pads are pretty small. At one of the South,n Spine Raid TechSessions, we measured the temperature on several rear drives with an infrared reader. I can't find those results (or which SSR we did that), but I don't recall any being "burn hot." thmper has given you a good starting point, then on to checking bearings . . . Link to comment Share on other sites More sharing options...
stewgnu Posted July 22, 2018 Share Posted July 22, 2018 I’d guess brake drag too- i melted the anodising off my oe rear disc at the scotch guzzi rally t’other year! Link to comment Share on other sites More sharing options...
docc Posted July 22, 2018 Share Posted July 22, 2018 Just pulled in from about 35 miles riding, the last 15 at about 80 mph. Rear drive: 122ºF, rear brake disc: 88ºF. Link to comment Share on other sites More sharing options...
Lucky Phil Posted July 23, 2018 Share Posted July 23, 2018 Just pulled in from about 35 miles riding, the last 15 at about 80 mph. Rear drive: 122ºF, rear brake disc: 88ºF. Nice one docc, I love data. Maybe we should have a "data" sticky thread. You know when someone lists some data that may be useful for comparitive purposes you can go there if you have an issue and are curious. Obviously there will be a scatter of data but you can get a general idea. Heres a few to consider. Idle rpm Rear drive temp Altenator output voltage Tyre pressures and mileage obtained. Oil pressure Oil consumption Wheel Bearing life Other bearing life. Oil seal life Drive shaft uni joint life. Ciao Link to comment Share on other sites More sharing options...
docc Posted July 23, 2018 Share Posted July 23, 2018 Oh! Science! I love science in so many ways! And with motorcycle content: https://www.dailymotion.com/video/x11lvw Link to comment Share on other sites More sharing options...
docc Posted July 29, 2018 Share Posted July 29, 2018 Any word on the hot rear drive, Canonman? Link to comment Share on other sites More sharing options...
Canonman Posted July 29, 2018 Author Share Posted July 29, 2018 I am in the process of researching the problem. It seems to me that this is not a differential problem but a yoke of the brake that gets very hot. I have to give a brake to regenerate. It is possible that the piston is jamming. 1 Link to comment Share on other sites More sharing options...
docc Posted July 29, 2018 Share Posted July 29, 2018 Yes, that is very likely. Always bleed the rear brake with the bleed nipple facing upward. Link to comment Share on other sites More sharing options...
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