Engine sprocket

Previously bill_butler wrote:

There is a 17 tooth engine sprocket on my '54 ES2 but I think it should be bigger. Does anybody know the correct size.

Regards

Bill

20T for ES2 Peter Holden

Previously bill_butler wrote:

There is a 17 tooth engine sprocket on my '54 ES2 but I think it should be bigger. Does anybody know the correct size.

Regards

Bill

17 tooth sprocket was used when lugging a sidecar about

regards

Derek Ambler

Yes, 20T is standard but you can go higher.For relaxed cruising you could go 21T. My poor Man's Manx has a 22T on the engine but that's something else.

Don't forget there are 3 different offsets on the singles so match up with your 17T. All sprockets available from RGM.

I had a 22 on my '51 ES2 when I first put it on the road, I found that it was reluctant to pull up hills when loaded with luggage. With no luggage it comfortably cruised at 60-65.

I then went to a 20T as thats what the book said it should be. It's much better now, cruising speed is more 55-60 but it will do that anywhere, even when carrying luggage and going up hill. The acceleration is better too so for most of the riding I do its fine. If anything its a little on the low side, I reckon it would pull a 21T so maybe thats a job for the winter .

Agreed Andy, a 21T sounds a good compromise.

I have the std 20T on my ES2 big bore but with a 20T on the gearbox, which is a slight compromise but makes it faster than standard all the same.

Previously bill_butler wrote:

There is a 17 tooth engine sprocket on my '54 ES2 but I think it should be bigger. Does anybody know the correct size.

Regards

Bill

Hi Bill,

ES2's came standard with a 20 tooth engine sprocket and a 19 tooth gearbox sprocket. Like earlier commentors said, running a 21 tooth sprocket will make it a bit less "busy" at cruising speeds. I have a 19S bumped up to 626cc and it pulls a 21 tooth gearbox sprocket and 20 tooth engine sprocket with ease. Granted, it has a bigger engine but the taller gearing really keeps down the shakes. Norton singles seem to be able to pull fairly tall gearing without much discomfort.

regards,

Albert

Hi guys I know it's an old thread but hoping for some helping a complete douchebag and have little to none knowledge. . I have a model 50 wideline featherbed( frame was originally from a 59 Donnie ss) and it's running a 17tooth engine sprocket. Im looking to up this to a 19tooth as 1st and second gear are next to useless lol. However I can't seem to find anywhere that has engine sprockets. Let alone one to do the job I need. Have tried 'andover' , 'burton' , 'norvil' and British bike Austriaif anyone can please help

RGM list them, with a choice of teeth and offset. Search their site for sprocket. https://www.rgmnorton.co.uk

Ian McD

Many thanks will get on to them asap.