You are here: Home / Messages / Light Twins / HELP PLEASE


Up to Light Twins


Posted by Kay Chambers at Monday 14:44

In the process of building a Jubilee from a box of bits and now confused. I have 3 barrels and 3 heads.

Barrels id numbers 20749/20747/lh-rh 20717?

Heads X 20717rh-am   X20715lh-am   also 22941rh

I believe x20717/15 are Jubilee is the barrels 20749/47 are these the correct ones? Plus is 22941 also Jubilee? as this is in better condition.

Please can anybody advise as desperate.




Posted by patrick_mullen at Monday 19:58

Hello there,

These numbers are casting numbers and in the case of the cylinder heads I believe that  X20715 and X20717 are Jubilee heads.  The other head is probably from a Navigator.

Measure the bore of the barrels to be certain- 60mm bore size is Jubilee-.  I checked a couple of spare barrels here but the number is not clear on either of them.  I was once told that a casting number commencing with 20 indicated a Jubilee part but I wouldn't want to swear to that info.

Also check that the heads and barrels match - some have spigots on the barrels and some don't.



Posted by Dan Field at Monday 22:24

I have some heads if you get stuck


Posted by andy_sochanik at Monday 23:49

The heads marked 'X'(number) are for the Jubilee model.

22941rh is probably for a Navigator (not Jubilee) - but might also be for an Electra depending on a couple of points.

Separate cylinder barrels are for a Jubilee - the Navigator (& Electra) has a cylinder block.

The L/H cylinder barrel has regular finning (above the primary chaincase).

The other barrel (R/H) has the bottom fins cut away to allow for the timing cover - see photo.

As Patrick says - make sure the heads & barrels match..

The barrels should have spigots at the top, and the heads should have recesses to match.

Drop me a line at for any more info.

Andy S



Posted by patrick_mullen at Tuesday 09:24

That is one good looking Jubilee and very much a credit to someone.  Green & Dove Grey do go together so well - I wonder why Norton produced so few in these colours. Shame it isn't BRG as it would make a perfect match for my MGBs.

Powered by Ploneboard
Upcoming Events
Norfolk branch camping weekend May 12, 2017 - May 14, 2017 — Whitwell and Reepham railway station, Reepham, Norwich NR10 4GA 01603 871694
CRMC Track Parade - Mallory Park May 20, 2017 - May 21, 2017 — Mallory Park,Church Rd, Kirkby Mallory LE9 7QE
Surrey Branch at the Kempton Park Classic Motorcycle Show & Auto-jumble May 20, 2017 09:30 AM - 04:00 PM — Kempton Park, Staines Road East, Sunbury on Thames, Middlesex TW16 5AQ
Tay Valley Branch - lunch meeting May 21, 2017 11:00 AM - 04:00 PM — Ben Lawers Hotel,Loch Tay, Aberfeldy, Perthshire, PH15 2PA
Yorkshire Branch at the Sowerby Bridge Classic Bike & Scooter Show May 28, 2017 10:30 AM - 04:30 PM — The Wharf, Sowerby Bridge HX6 2AG
Upcoming events…
This is Brio Diazo Plone Theme