Some bikes have a gearbox designed to run with a semi fluid grease...BSA recommended engine oil for their wartime and later boxes...SAE40 or SAE 50 is suitable...The BSA box has a number of small drillings that allow the lubricant to reach various components and these are unsuited to allow the passage of a grease...The implications of lubrication shortages are obvious..Further, the oil serves to cool as well as lubricate the gearbox bearings...
IMO therefore, I would not advise going down that route with the BSA...Fitting a sealed main bearing with the inner seal removed cures the excessive leakage of lubricant from the box but that is plainly a job best done when the box is apart for remedial work. With the standard set up it's really a case of putting up with the leaks and checking the gearbox oil level at no more than 300-350 mile intervals, topping up as required...Ian
Heed the warning.
I put 000 grease in my box following the advice of a friend who had a dozen or more bikes & had grease in all of them.
Worked fine for him cause he would be flat out putting 100miles/year on any bike.
On mine where I was putting 30,000+ a year, totally destroyed it in less than 2 years.
Almost nothing was recoverable
I have a photo copy of the manual provided to Australian Military Forces and gearbox oil recommended is GO-90. What the GO stands for I don't know but I am using the modern gear oil 80W-90. Maybe due to the hotter climate in Australia the heavier oil was recommended. 80W-90 pours quite easily so I would think in hotter climates it would be okay and should get into the oilways okay.
