hon450 Posted August 9, 2018 Report Share Posted August 9, 2018 Would anyone have bearing numbers for all the needle bearings in the gearbox. I would like to replace everything while I have it apart. Would anyone have recommendations on where to order the bearings from. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
lotus54 Posted August 12, 2018 Report Share Posted August 12, 2018 (edited) I’d contact Kieth Lynas at OSSA Planet. http://www.ossaplanet.com/ Make sure you carefully shim everything when reassembling. They are picky about that. Edited August 12, 2018 by lotus54 Quote Link to comment Share on other sites More sharing options...
pmk Posted August 13, 2018 Report Share Posted August 13, 2018 In regards to OSSA parts, I have been buying from Alex Snoop in New York. Alex has been great to get stuff from. He recently rebuilt my friends MAR crankshaft, that engine will be going together this fall. Quote Link to comment Share on other sites More sharing options...
hon450 Posted October 28, 2018 Author Report Share Posted October 28, 2018 Sorry for the late response. I appreciate the help. I am seeing you can buy the case bearings. But do you have to source the needle bearings for the gears from a bearing supply company. Has anyone actually took the time to replace these. Thanks again. Quote Link to comment Share on other sites More sharing options...
woody Posted October 29, 2018 Report Share Posted October 29, 2018 Not sure which needle roller bearings you mean? The MK1 mainshaft runs on normal roller bearings and the layshaft runs in bushes. On later MAR, TR77 on, maybe MK3, the layshaft runs in needle rollers rather than bushes but they won't work with the earlier gearbox as the shafts are different lengths and diameters on early / late boxes, even though they look identical side by side In all gearboxes there is a needle roller under the 1st gear cog on the layshaft - I've never had to change one of these as never seen one worn. There are two that the final drive sleeve gear on the mainshaft runs on. Never had to change these either. None of them have serial numbers that I've ever seen so you'd need to measure and obtain from a bearing stockist if you want to replace if none of the old Ossa dealers in the US stock them. Not aware of anyone in the UK or Europe that does 1 Quote Link to comment Share on other sites More sharing options...
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