Navigator Carburettor Alternatives

I couldn’t get a concentric to work on my Jubilee, dont know about the Navigator, but I think I was quoted for a properly jetted Mikuni from Motocarb or Allens performance if you can bear the idea of a jap carb!  Mikunis are about £200 I think. I recently bought a Lectron for my Yamaha, that was £600…. Ouch!  If I were you I’d buy the proper monoblock, I’ve never regretted buying a new proper carb!

A cheap worn monoblock can be reconditioned to perform like new. 

Agree with Robert Tuck. Auto Jumbles are a great source of spares.

Dont worry about the -48 of "375/48" - it refers to the factory build for a certain bike - so a 375/47 would also be a nice find, as that was for the DeLux (faired-in) Navigator. An Electra carb (375/54?) would also be suitable - but the main jet size would need checking.

You need to find a 375 Carb with a choke size of 7/8" - that is the important bit. All the other bits (throttle bodies, jets, etc) can still be supplied

Enjoy the hunt!

If a worn monobloc is to be refurbished does that mean resleeving (the slide bore) and fitting a new slide? 

Had a quick look on the net, could not find anyone offering this service, anyone know if this service is still being offered?

The nearest I have got to doing this was with a 389 monobloc, earlier carbs of this size had a thicker wall thickness so could be bored to remove the wear, I then made an oversize brass slide.  A bit of a faff to do but the carb was knackered and money was tight. Improved things somewhat but not the spectacular improvement I hoped for!

Don't know if the wall thickness comment applies to other size monoblocs.

Buying a new (monobloc) carb would be my favoured way forward now.

Carb body is bored and a slide with a sleeve on it is supplied. Standard slides no longer fit . 

Sleeving the carb body so a new slide would fit was also a "thing" at one time, my googling didn't find anyone offering this now.