Gearbox Whine

[mo goldie]

Hi everyone I am new on here as well as to BSA`s so please bear with me as to my questions I have regarding my ride, first off I have had a look at the forums and found out a lot about how to do things on here and that has been well helpful, I have a rep Rgs and was told it has been built from the ground up......and yes it has but I went out on my first ride and had all sorts of problems oil coming out all over the clutch side of the bike and all underneath so I have had the inner and out primary side off 4 times...... now found out that it was chucking oil out of the breather ( told you I was new to BSA`s ) but I have fixed all that now... by the way it had only done 2 miles on the road since 2003 .....now its done 130 miles but it was meant to have a gearbox overhaul as well as everything else done,,,,but in second gear there is a slight whine and in third there is a really loud whine, now in first and top it is fine, the problem is I am going to wait to strip the gearbox down over winter but was wondering where to get parts like bush's gears etc from as cant seem to find anywhere to go for things like that so if you know where I can get them please tell me as I am at a loss with that one, also if you might know where the most likely thing that is coursing the whine, and just to say I tried using EP90 oil then was told to use GP50 oil and well both did not make any difference at all so I dont think it`s got anything to do with oil as it is so loud more so in the 3 gear.........anyway your help will be most appreciated and I look forward for your help.... Thanks Mo             

[Mark N]

I haven't looked for your specific parts, but I think anyone with a BSA should check the Draganfly Motorcycles website for parts and information; It's awesome!

[mo goldie]

Thanks mark I have look there and the 3 rd gear I know is not stocked......but that is where I have been getting some of my parts from.....thanks again mark.

[chaz]

with no details other than RGS replica, its not much help.
year and engine number may help more.
then , find part number in relevent parts book and google search or ebay search usually finds hard to find parts also google will often turn up another stockist other than Drags

[mo goldie]

Well Chaz......as I say I am new to this so cut a bit of slack...lol it`s a 1962 have not got the engine number to hand right now and as for part numbers well I have not got a parts book to get them from also as I said its the first BSA I have owned so that will be one thing on my list to get unless you know where I can go to get a download for one on line.........But Noted ...as I said the box is not going to be pulled out till over winter before I know what parts I am going to need,,,,,,,so That`s why I am asking where is the best place to fined them.....and yes I know Ebay is a good place to start.

[DerekAnderson8]

gearbox diagram attached

https://www.draganfly.co.uk/bsa/bsa/a710--b3133--c101112--m202133/category/1097-rigid-plunger-a-group-s-arm-a-b-group-and-all-4-speed-c-group

[chaz]

sorryMo a rush to get to work, Nightshift.
Ive posted on other threads a few places to download manuals and parts books for free
here is one

https://partsbooks.britishonly.com/#BSA650Twin

[mo goldie]

Cheers Derek and Chaz I will look tho that lot might be a great help.

[ChrisG]

Whine in gearboxes are usually down to worn bearings, particularly the layshaft bushes when the noise is in second and third. It's worth changing these regardless, but also worth waiting until you have stripped it down before purchasing expensive bits like gears.

A10 gearboxes are easy to strip and rebuild. With the help of my mate and Geoff at SRM on the other end of the phone we stripped and rebuilt another mates gearbox on a campsite in Brittany, with limited tools. This box has ran fine ever since!

Chris

[Ian C]

and just to say I tried using EP90 oil then was told to use GP50 oil and well both did not make any difference at all so I dont think it`s got anything to do with oil as it is so loud more so in the 3 gear.........anyway your help will be most appreciated and I look forward for your help.... Thanks Mo             

Just to add and forgive me if you're already aware.. Be careful of your choice of oil if the box has bushes.. Some Gear Oils have additives that will attack the bushes, but I believe there are bronze bush friendly formulations out there.. HTH

[mo goldie]

Hi all well the layshaft Bushes will get changed as a matter of course and a close inspection of the gears I will do when I strip it down and check all components for wear, as regard to oils I have gone from EP 90 and now running it with GP50 which is not made any difference at all so its down to wear in the box and as Chris has said about the two bushes on the ends of the layshaft which it runs in along with any other Bushes that might be wearing which I will look at when I do a tear down of the gearbox, so thanks for all your help and I hope to get it sorted out the end of this year.

Cheers Mo     

[chaz]

one other thing,,,, lets be technical....
probably yes the roller bearings do generate a whine when running and getting tired and worn. but
due to the gears being straight cut they will whine when meshed and running. if they were helical or helix gears they tend to runn quieter, same applies to hypiod and spiral gears, yes, a few years on a Sykes H160 and V60 gear cutting machine section making gears for train brake compressors and my own projects .
one of the best sounds is the old racing Mini cars like the 1275GT, straight cut gearbox, for quieter running and also synchro meshing the gears are now helical cut. racing mini's dont worry about noise and the older cars used to double-de-clutch which is not required now.

good quality and the correct ammount of oil is best

[JulianS]

You may not completely eliminate the whine.

I have owned my A10 for 46 years and it whined in third all tos eyears ago.

A number of early attempts failed to stop it.

Rebuilt in 2014 with new shafts bearings and pinions there was still a whine in third gear.

With a bushed layshaft it is not unusual to find the blind bush and shaft end to be badly worn.

I now use Morris Lubricants non EP gear oil.

https://www.morrislubricantsonline.co.uk/golden-film-ag-90-gear-oil.html

[mo goldie]

Hi Thanks Julian 46 years wow thats a long time to live with a whining gearbox, the thing being with mine is it is really loud and it turns heads but not for the bike but for the whine lol so think I will have the box out over winter and see what is going on in there so thanks everyone on your help.

Cheers Mo

[mo goldie]

Hi Chaz one thing I forgot to ask since you seem to be the gearbox man.............have you got any good quality gears and bits laying around for the gear box ?