Belt primary drive information

Hi Terry, mine looks the same as yours, I got it from Mike Pemberton (Pushrod Performance) who sourced them from Mick Hemmings. You need the diaphragm compressor to take it apart which is an easily sourced tool as the clutch is the same as the Commando type. Commiserations on the big end, hope it wasn't too traumatic.

as above, cannot be safely done without the standard Commando tool, from usual parts suppliers. Do you have workshop manual?

    for useful photos etc on parts of Nortons, , see oldbritts website and Mick Hemmings DVDs.

....three words that strike terror.....Triumph.....Sprung.....Hub

Hi Terry

I agree with Adam, I also got mine from Mick H.  I have the removal tool for the large circlip if you are near N Yorkshire  (It could  class as a necessary journey!)  and you are welcome to borrow it. 

Regards John O

I'm considering fitting a belt drive to my 1962 88SS, possibly a Bob Newby.

Some time ago I read that this was a no no because of the lack of a "cush" resulting in possible damage to the gearbox.

Has anyone got some up to date advice on this please?

david.

i,ve used newby belt drive,s on my 650ss and es2 for years with no problem,s.

david.

i,ve used newby belt drive,s on my 650ss and es2 for years with no problem,s.

i also have a commando with a rgm belt drive using the standard commando set up and find the power take up is better with a spring clutch...

Thanks Anthony, that's very god to know.

David......if you look through the Technical section of this site and the back issues of Roadholder,  you will find heaps of good advice on the pros and cons of fitting a belt drive conversion. Both have indexes which help with any searches.

If you don't have the official tool, you can make something with a 1/2" UNF bolt thru a large heavy steel washer (or length of bar) pressing on a metal ring. You want to apply pressue near the periphery of that ring of holes in the spring by winding in a nut placed on the bolt. There's a drawing the the Haynes Commando manual of a DIY tool. When the tools in place, give it a good hard pull to make sure it's secure, and maybe stand off to one side, before you release that circlip. Likewise when you put it back together.

BTW: the belt looks a bit tight to me.

Many thanks for this Philip. I'll have a good look at earlier stuff, and won't be rushing in to anything.

I bought  kit from Tony and he was very, very helpful. That looks like one of his, but I guess they all look the same. RGM got theirs from him.

You need to machine 5mm off the front sprocket to take a 25mm belt for a Dommie, instead of a 30mm Commando belt - or it will rub on the chaincase (or you could space the outer chaincase).

There are two types, ones that used Commando mainshafts with circlips, and later centres specially for Dominators.

Steve