1.e Norton SOHC Crankshaft Parts

- Large right hand thread driveside nut, secures engine sprocket on taper - Fits all SOHC engines and early DOHC engines.  CNC Machined.  Price is Each.

This is the Woodruff key that is fitted on the driveside mainshaft and stops the sprocket from rotating. It fits all Norton single engines, SOHC and OHV and SV engines. This item is for a pack of 3 woodruff keys

- SOHC Engine Sprocket (all models) for Pre-Featherbed models.  Various teeth available from 17T to 23T.  Update Feb 2025:  We are having a new batch of 19T/20T/21T manufactured at the moment, should be available approx May 2025.  Place order or email us to Pre-order, as only limited quanties.

- SOHC Engine Sprocket (all models including early DOHC Long Stroke Manx Type) for Featherbed models.  Various teeth available from 18T to 22T

This is a high quality Renolds primary chain, and Renolds split link to fit a Norton SOHC engine, with standard Norton clutch basket diameter (i.e. either International or Manx). Note: standard SOHC International/Manx primary chains are listed as 76 Links in the 1948 Norton spares catalog. Our chains are 78 links (including the split link), so you can fit the chain as is, or remove a link if a smaller sprocket is used.  Will also fit OHV and SV single cylinder models

Spare Renolds split link for Norton Primary Chain: (ignore number on the bag . . . I got it wrong .  .. it is 449!)

This is best quality Renolds primary chain (similar spec to the old GP type - now called Renolds Synergy), and Renolds Synergy split link to fit a Norton SOHC engine, with standard Norton clutch basket diameter (i.e. either International or Manx). Note: standard SOHC International/Manx primary chains are listed as 76 Links in the 1948 Norton spares catalog. Our chains are 78 links (including the split link), so you can fit the chain to be sure - in case using a larger than standard engine sprocket. 

This is best quality Renolds Synergy Spare Split Link, to go with our Racing quality primary chain (item 0886).  Price is per split link 

This is best quality Renolds Synergy Spare Split Link  + one half (i.e. 1.5 links), to go with our Racing quality primary chain (item 0886).  Price is per split link.  See listing detail for more information

- Essential when rebuilding your SOHC engine to ensure that the conrod sits central in the crankcase and that the roller bearing inner cage on the drive side does not have excess play on the crankshaft - This is for a single shim in one of the following sizes: 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your SOHC engine to ensure that the conrod sits central in the crankcase and that the roller bearing inner cage on the drive side does not have excess play on the crankshaft - This is for a complete set of 5 shims in the following sizes :

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your engine to ensure that the conrod sits central in the crankcase and that the roller bearing inner cage on the drive side does not have excess play on the crankshaft. This is for a single shim in one of the following sizes: 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your engine to ensure that the conrod sits central in the crankcase and that the roller bearing inner cage on the drive side does not have excess play on the crankshaft. This is for a complete set of 5 shims in the following sizes : 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your engine to ensure that the mainshaft bevel has the correct backlash and position in relation to the lower vertical bevel gear, these mainshaft shims fit between the timing side main bearing and the mainshaft bevel gear - This shim is used once the crankshaft has been shimmed and you are fitting the lower bevel gears. This is for a single shim in one of the following sizes: 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

- Essential when rebuilding your engine to ensure that the mainshaft bevel has the correct backlash and position in relation to the lower vertical bevel gear, these mainshaft shims fit between the timing side main bearing and the mainshaft bevel gear. This is for a complete set of 5 shims in the following sizes : 

0.5mm/0.3mm/ 0.2mm/0.1mm/0.05mm.  See listing for more detail on thicknesses.

This is the crankshaft bevel gear,, fitted to SOHC International (i.e. aluminium crankcase models - not magnesium) and 1930 onwards CS1 engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. Price is Each. Price is Each.  24/12/21: - New batch Just in - identical to previous batch

- This is the crankshaft bevel gear,, fitted to SOHC pre-Featherbed magnesium racing engines - i.e. M30/M40 and SOHC Manx type engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. Price is Each.Price is Each.  24/12/21: - New batch Just in - identical to previous batch

- This is the lower vertical bevel gear, fitted to all SOHC International and Manx engines and also fitted to earlier DOHC Manx engines. These gears faithfully replicate the original Norton tooth profile and pattern and we have them made for us by a top specialist UK gear manufacturer. See detail listing for more information.  Price is Each.  24/12/21: - New batch Just in - identical to previous batch

Correct (and as per original) 1/4" BSP 'One Way Valve' - as fitted to all Norton singles, including all SOHC, OHV and SV models - this item screwing into the recess just above the drive side main bearings, allowing the engine to breathe correctly. July 2023: Now back in Stock 

- Good quality Copper washer suitable for 1/4" BSP fittings on most Norton SOHC/OHV/SV engines - i.e. One Way Valves, Breather Unions and Crankcase Oil unions. They can also be fitted to 1/4 BSP petrol taps if required - see listing for details. Sold as a pack of 3

These are the unions that screw into the crankcase behind the timing chamber - it is the smaller 1/4" BSP side that screws into the crankcase, the larger side is 3/8" BSP and takes the distinctive large oil pipes fitted to Norton Internationals. 

This is the Union that fits into International and SOHC Manx crankcases for both Feed and Return. It allows for the standard 3/8" BSP SOHC Norton oil pipes to be connected. It is very close to original but is a modern item, and uses a larger spanner hex, requiring a UNF spanner. This is a cheaper alternative to the original brass union that I have made specially (Item no 0246), but as you only need to screw it in once this is not really an issue - item is still high quality and is cadmium plated. - Price is per each

This is a faithful reproduction of the straight through union fitted to SOHC (and DOHC) cambox's for connecting the cambox oil feed pipe (fitted at top of crankcase and cambox), but also used as a front crankcase breather on many Inters and magnesium racing engines.  Finally it is also fitted as a breather union on the bevel chamber of magnesium racing crankcases behind the inner timing cover (while Inter crankcases instead employ a pressure telltale unit).  Copied from an original pre-war item

This is modern replacement for the straight thru breather used on Norton crankcases and timing cases - but uses AF Hex (not Whitworth) - if you are not worried about originality!

These Red Fibre Washers are a smaller diameter than 'normal' 1/4" BSP washers - but then pre-threaded by us - so they are a good fit on those Norton fittings that used 1/4" BSP thread, but have a groove behind the thread - e.g. Norton pre-48 Oil Sump Plugs and some breather union fittings.  See detail listing for more information.  This listing is for a bag of 5 washers

Distinctive small hex blanking plug/bolt that locates on the left side on the crankcase lower bevel platfom.  CNC maufactured in stainless steel and includes red fibre washer 

- Modern equivelant Dowty washer (outer washer is zinc plated steel, inner washer is neoprene). This washer is used behind the timing chamber filter bolt and also at the back of the rear cylinder crankcase mouth bolt (that has an oil feed)

Breather Pipe (listed in Norton 1948 catalog as Pressure Release Pipe) and 1/4" BSP union nut to fit bevel chamber of all SOHC models (30/40, M30/M40 etc)

Breather Pipe (listed in Norton 1948 catalog as Pressure Release Pipe) and 1/4" BSP union nut to fit bevel chamber of all SOHC models (30/40, M30/M40 etc)