This is the large single ball bearing that was fitted on the top vertical bevel gear housing on the SOHC Walter Moore CS1 or CSJ engine, manufactured from 1927 - 30.  This is a high quality SKF brand bearing.  

The second picture of this listing shows the Norton Spare Parts List for the 1927-30 CS1 Model, showing the bearing listed here - as Part No 4130.  

This bearing is a high quality SKF bearing.

If you have a requirement for other bearings to fit CS1/CSJ or other 1920's Norton models - we may be able to obtain them - email us at sales@racingvincent.co.uk

This is the single row roller bearing as fitted to both sides of the SOHC Walter Moore CS1 and CSJ 1927 - 1930 engines.  It was also fitted to Model 18 engines of the same period. These are the correct original 'C3' looser fit bearings - but are from a slightly lesser quality NKE brand (i.e. not RHP Brand).  See listing for more detail

Update Jan 2022 -  In previous years, we have been able to obtain this bearing in UK quality RHP brand.  However, RHP are no longer manufacturing the C3 fit version of this bearing - therefore as an alternative - we are now able to offer NKE Brand 'C3' Fit alternatives.  These are an offhshore brand - and not of quite the same high quality as original RHP . . . but is ultimately how it will go with all the main Norton bearings, as original RHP brand run out.  These bearings are still of a reaonable quality, and unless you are still riding your bike 20k miles a year . . . should be fine!  (and are of course much cheaper than any 'new old stock' RHP brand versions we are still able to find.

Backround Information on C3 or Standard Fit bearings:

These 'standard fit' bearings are exactly the same manufacture as the C3 versions, except when fitted they have a less loose tolerance - so if you decide to fit them, bear this in mind and allow for it when first running them in (however, many people historically did not realise there were different fit bearings - so you may find your engine has already been fitted with standard bearings by a previous owner.  Original C3 bearings will normally have either C3 stamped after the main bearing designate on the outer race, or 3 dots (i.e. '. . .'), which was often the old way of showing them as C3 fit. 

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing (as was the case with all SOHC engines).  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings (and once ours have inevitably ran out)

Manufactured by a well established and specialist British bearing supplier who have been making these Bigends for many years - this Bigend is of the same design and specification as the original 1930's - late 1950's OHV and SV design - this being a twin row, crowded roller design (i.e. the rollers do not sit in a cage).

These BigEnds come supplied 'hot dipped' in protective grease as per photograph, as a complete assembled unit and include the Bigend Nuts as well.

A typical OHV mid-1950's crankshaft is shown in the second photo (this being from a 600cc Model 19) - but this Bigend is of the type fitted to all OHV and SV models from the 1930's to the late 1950's - i.e: Model 18, ES2, Model 19, 500T, Model 50 (350cc), 16H and Big 4.  Email us at sales@racingvincent.co.uk if you are unsure if this will fit your model 

Update Feb 2021: We are now offering these OHV/SV Bigends, from the same manufacturer that has provided our SOHC BigEnds for many years.  If you wish to have these Bigends fitted and the outer race honed by us - then contact us at sales@racingvincent.co.uk for availability and turnaround time (we have offered this service for SOHC conrods for many years).

FYI - If these are showing out of stock - it normally means we have a new batch on order, so feel free to order and we will email when a new batch is expected in - this normally is no longer than 1 - 2 months from showing out of stock

If you wish to use your OHV engine for high performance work, we also offer a 'caged roller' version of the same Bigend - see Item 0864 

Manufactured by a well established and specialist British bearing supplier who have been making these Bigends for many years - this particular Bigend is of modified 'Caged Roller' design - more suited to high performance than the original Crowded Roller type.  Comes complete with BigEnd nuts.

The overall dimensions of this Bigend are as per the original - so can be fitted to standard crankshafts without any modification - but like SOHC engines, they have rollers running in a cage - which means they are less likely to rub and overheat.  They are more suited to an OHV engine that is being used for prolonged high speed usage or performance events.  (However - do not forget:  OHV and SV engines were originally fitted with Cast Iron flywheels - not steel flywheels like the OHC engines, therefore you still need to bear this in mind - from my own experiences racing OHV engines, I know the flywheels are often the limiting factor!).  

These BigEnds come supplied 'hot dipped' in protective grease as per photograph, as a complete assembled unit and include the Bigend Nuts as well.

A typical OHV mid-1950's crankshaft is shown in the second photo (this being from a 600cc Model 19) - but this Bigend is of the type fitted to all OHV and SV models from the 1930's to the late 1950's - i.e: Model 18, ES2, Model 19, 500T, Model 50 (350cc), 16H and Big 4.  Email us at sales@racingvincent.co.uk if you are unsure if this will fit your model 

Update Feb 2021: We are now offering these OHV/SV Bigends, from the same manufacturer that has provided our SOHC BigEnds for many years.  If you wish to have these Bigends fitted and the outer race honed by us - then contact us at sales@racingvincent.co.uk for availability and turnaround time (we have offered this service for SOHC conrods for many years).

FYI - If these are showing out of stock - it normally means we have a new batch on order, so feel free to order and we will email when a new batch is expected in - this normally is no longer than 1 - 2 months from showing out of stock

We also offer a similar OHV/SV BigEnd with the original type 'Crowded Roller' design, which is slightly cheaper - Item 0863

Manufactured by a well established and specialist British bearing supplier who have been making these Bigends for many years - these Big End Nuts are to fit the standard OHV and SideValve Norton Big Ends.   

Price is Each

We sell complete OHV/SV Big Ends complete in two guises - Original (uncagegd) type - Item 0863 and Modified (caged) type  - Item 0864, both of which complete with the same nuts as shown here, but if for any reason you need a spare nut (or have damaged an original Big end nut, as often happens) - then these nuts should fit most original Norton OHV/SV Bigends.

Note, if buying these nuts to fit an original Big End - please email first to confirm thread details (as there have been many aftermarket manufacturers of Bigends over the years - and some may have used non original threads) 

- Single row ball bearing. Fitted to all pushrod and sidevalve engines (from 1930's to late 1950's). These are original high quality RHP bearings (plastic sealed), in the correct C3 fit - now extremely difficult to find

Update Feb 2021: As previously updated, these OHV/SV ball main bearings - from original manufacturer RHP, in the correect 'looser tolerance' C3 fit are now just as rare as the corresponding SOHC versions, and obsoleteu/unobtainable.  We sold our last stock at the end of 2020.

We are waiting for an update on a small delivery of the correct RHP C3 (with price expected to be @£110 each), but if you wish to reserve one now, please email us on sales@racingvincent.co.uk

It is worth noting that we also have a few of the same bearing from RHP, but in 'standard' fit - this is Item 0733.  This is exactly the same high quality bearing, but it is not quite as 'loose' when new as the C3 fit.  This just means you need to be a little bit more careful when running the bike in, to let them wear in first - so to avoid the bearing spinning in the crankcase bearing housing.  If you think you have a crankcase where the bearing may have previously spun in the housing (and the alloy bearing housing looks slightly grey or worn) - then I would advise paying the extra money and going for the C3 fit listed here - while they are still available.

Failing both options above, we may be able to obtain these bearings from one of the modern lesser brands in the near future - again, email us for details.

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing.  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings

- Single row ball bearing. Fitted to all pushrod and sidevalve engines (from 1930's to late 1950's). These are original high quality RHP bearings (plastic sealed)- but are in a 'standard' fit, not the original looser C3 fit.  Feb 19: Read detail lisitng for update

Update Feb 2019:  We do sell the correct C3 fit version of this bearing, which Norton originally fitted - that is Item 0242, but stocks of that bearing are extremely limited, and if sold out, or you feel comfortable to fit the standard fit type listed here (which is slightly cheaper), then this is still the high quality RHP brand and still an excellent bearing.

Just like the even harder to find 'C3' version of this bearing - these bearings are now obsolete and very difficult to find, I only have a few of these left and once they are gone am not sure if I will be able to obtain more.

Fitting a 'non C3' bearing just means you need to be a little bit more careful when running the bike in, to let them wear in first - so to avoid the bearing spinning in the crankcase bearing housing.  If you think you have a crankcase where the bearing may have previously spun in the housing (and the alloy bearing housing looks slightly grey or worn) - then I would advise paying the extra money and going for the C3 fit listing - Item 0233 - while they are still available.

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing.  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings

Single row roller bearing. Fitted to all pushrod and sidevalve engines (from 1930's to late 1950's).. These are original high quality RHP bearings (plastic sealed), in the correct C3 fit. 

Update Feb 2021 - Sorry, but now out of stock - and obsolete/unavailable from the original high quality RHP manufacturer.  The price has been updated to reflect a quote I have had to source this bearing from one of the specialist suppliers still holding a handful of them - email us on sales@racingvincent.co.uk if you wish to order one and we can confirm cost/availability, and may require a deposit.

However, as at early May 2021 - we have obtained a small batch of remaining RHP brand roller bearings for this model, but in non-C3 fit version, see Item listing 1009 in this same section.  We can also obtain the correct C3 fit from a lesser quality brand - NKE, email us sales@racingvincent.co.uk if you would like more information on these. 

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing (as was the case with all SOHC engines).  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings (and once ours have inevitably ran out)

Single row roller bearing. Fitted to all pushrod and sidevalve engines (from 1930's to late 1950's).. These are original high quality RHP bearings (plastic sealed), but are in Standard fit (i.e. not the C3 loose tolerance fit that would have been originally fitted).  

Update Jan 2022 - As you will see if you have read the Item listing for the original 'C3 fit' version of this bearing (Item 0243) from top UK manufacturer RHP is now unavailable (and if you have any original unused C3 bearings still in sealed packaging you would like to sell . . . feel free to email us),

Last year (2021) I reported that even the RHP 'Standard Fit' was not getting extremely difficult to get hold of and prices getting high.  Well - we have managed to get a few more, but price has now gone even higher - sorry, but these are now obsolete - as we manage to source the last few RHP (highest quality) available - the price will continue to rise further.

However, as an alternative - we are now able to offer NKE Brand 'C3' Fit alternatives.  These are an offhshore brand - and not of quite the same high quality as original RHP . . . but is ultimately how it will go with all the main Norton bearings, as original RHP brand run out.  These bearings are still of a reaonable quality, and unless you are still riding your bike 20k miles a year . . . should be fine!  - for these see Item 1073

Backround Information on C3 or Standard Fit bearings:

These 'standard fit' bearings are exactly the same manufacture as the C3 versions, except when fitted they have a less loose tolerance - so if you decide to fit them, bear this in mind and allow for it when first running them in (however, many people historically did not realise there were different fit bearings - so you may find your engine has already been fitted with standard bearings by a previous owner.  Original C3 bearings will normally have either C3 stamped after the main bearing designate on the outer race, or 3 dots (i.e. '. . .'), which was often the old way of showing them as C3 fit. 

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing (as was the case with all SOHC engines).  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings (and once ours have inevitably ran out)

- Single row roller bearing. Fitted to all OHV/SV pushrod and sidevalve engines (from 1930's to late 1950's). These are the correct original 'C3' looser fit bearings - but are from a slightly lesser quality NKE brand (i.e. not RHP Brand).  See listing for more detail

Update Jan 2022 - As you will see if you have read the Item listing for the original 'C3 fit' version of this bearing (Item 0243) from top UK manufacturer RHP is now unavailable (and if you have any original unused C3 bearings still in sealed packaging you would like to sell . . . feel free to email us),

However, as an alternative - we are now able to offer NKE Brand 'C3' Fit alternatives.  These are an offhshore brand - and not of quite the same high quality as original RHP . . . but is ultimately how it will go with all the main Norton bearings, as original RHP brand run out.  These bearings are still of a reaonable quality, and unless you are still riding your bike 20k miles a year . . . should be fine!  (and are of course much cheaper than any 'new old stock' RHP brand versions we are still able to find.

Backround Information on C3 or Standard Fit bearings:

These 'standard fit' bearings are exactly the same manufacture as the C3 versions, except when fitted they have a less loose tolerance - so if you decide to fit them, bear this in mind and allow for it when first running them in (however, many people historically did not realise there were different fit bearings - so you may find your engine has already been fitted with standard bearings by a previous owner.  Original C3 bearings will normally have either C3 stamped after the main bearing designate on the outer race, or 3 dots (i.e. '. . .'), which was often the old way of showing them as C3 fit. 

Final point on ball and roller main bearings fitted to 1930's/50's OHV and SV engines: Unusually, Norton's showed a roller bearing being fitted on both sides of the crankcases on OHV/SV engines (i.e. 1948 catalog), with a ball bearing fitted just on the outer drive side.  However, I have stripped OHV engines down in the past where a ball bearing is fitted both sides, with just the drive side inner being a roller bearing (as was the case with all SOHC engines).  Not sure if it makes a great deal of difference - as like the SOHC engine, the OHV/SV engine was locked to the timing side bearing - but worth noting if you are struggling to find two roller bearings (and once ours have inevitably ran out)