what countershaft sprocket for a Roadster 750?

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Lorenzo

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a premise: I own the 750 Roadster year 1973, which is *not* a combat engine..
I am going to have a brand new countershaft sprocket and I am not sure what is the best 'teeth number size', also according to my engine..

I already purchased the 21 teeth one, but I have been suggested to have a lower number, like the 19th, in order to better suit the character of the 750 engine..

I understand this is a quite personal taste of riding, but what is your experience and suggestions?
 
My '71 Roadster originally had a 19 tooth sprocket. I found it revved too high on the open road, ie 4000 rpm at 60 mph/100kph. I've bought a 20 tooth which will reduce the revs by approx. 500 at the same speed. Haven't fitted it yet but Norton owning friends say it won't make much difference to acceleration.
 
Thank you Komet..
I heard that for whatever reason, it is not suggested to have an uneven number of teeth in order to minimize wear patterns..
any comment on this?

komet said:
My '71 Roadster originally had a 19 tooth sprocket. I found it revved too high on the open road, ie 4000 rpm at 60 mph/100kph. I've bought a 20 tooth which will reduce the revs by approx. 500 at the same speed. Haven't fitted it yet but Norton owning friends say it won't make much difference to acceleration.
Click to expand...
 
Lorenzo said:
Thank you Komet..
I heard that for whatever reason, it is not suggested to have an uneven number of teeth in order to minimize wear patterns..
any comment on this?

komet said:
My '71 Roadster originally had a 19 tooth sprocket. I found it revved too high on the open road, ie 4000 rpm at 60 mph/100kph. I've bought a 20 tooth which will reduce the revs by approx. 500 at the same speed. Haven't fitted it yet but Norton owning friends say it won't make much difference to acceleration.
Click to expand...
Click to expand...

That is an old wives tail retold by those with no mechanical knowledge. Odd or even, makes no difference.
The sprocket is personal taste, riding style, etc. High speed cruising? Back road blasting? Do you like LONG LEGS? Or tractor gears? I run 22T and cruise is a relaxed trot at 80 mph. On secondary roads 2nd and 3rd are used, never 4th.
 
one tooth is on average a 250 RPM difference.

komet said:
My '71 Roadster originally had a 19 tooth sprocket. I found it revved too high on the open road, ie 4000 rpm at 60 mph/100kph. I've bought a 20 tooth which will reduce the revs by approx. 500 at the same speed. Haven't fitted it yet but Norton owning friends say it won't make much difference to acceleration.
Click to expand...
 
IMHO the best compromise is a 21 tooth. if you do almost NO highway and want to do the stop light to stop light thing than a 19 is OK but it is VERY busy if you want to run 70 MPH. A 20 is not a lot of change.

Lorenzo said:
a premise: I own the 750 Roadster year 1973, which is *not* a combat engine..
I am going to have a brand new countershaft sprocket and I am not sure what is the best 'teeth number size', also according to my engine..

I already purchased the 21 teeth one, but I have been suggested to have a lower number, like the 19th, in order to better suit the character of the 750 engine..

I understand this is a quite personal taste of riding, but what is your experience and suggestions?
Click to expand...
 
everything is telling me I should stay with the 21 teeth as perhaps the best compromise..?!
 
Lorenzo said:
everything is telling me I should stay with the 21 teeth as perhaps the best compromise..?!
Click to expand...


At one time, when there were no speed limits or speed limits were not enforced on autobahns and autostrade I used a 22 in Europe. But in the US, the 19 was always the best bet, especially when those pesky Kawasaki H1s came around. Now with the more strict enforcement of speed limits in most of Europe, unless you will only be in Germany, the 19 is the best bet in Europe too. Vedo che dici di essere di Roma. Io sono Livornese.
 
ciao Montelatici! yes, I come from Rome and I am in Canada since three years ago.. ;o)
so far the 21 teeth was good, but I never tried the 19 teeth and I must say I am not that kind of guy to challenge the Kawa..

montelatici said:
Lorenzo said:
everything is telling me I should stay with the 21 teeth as perhaps the best compromise..?!
Click to expand...


At one time, when there were no speed limits or speed limits were not enforced on autobahns and autostrade I used a 22 in Europe. But in the US, the 19 was always the best bet, especially when those pesky Kawasaki H1s came around. Now with the more strict enforcement of speed limits in most of Europe, unless you will only be in Germany, the 19 is the best bet in Europe too. Vedo che dici di essere di Roma. Io sono Livornese.
Click to expand...
 
I like my 19 tooth. But I only ride the secondary roads and rarely above 60 mph. Mostly 45-55. I wouldn't even consider a taller one.

Dave
69S
 
dave
if you do ANY 70MPH riding than you will want to get rid of that 19 in a big hurry :lol:

DogT said:
I like my 19 tooth. But I only ride the secondary roads and rarely above 60 mph. Mostly 45-55. I wouldn't even consider a taller one.

Dave
69S
Click to expand...
 
If you never get out of the traffic lights , Try a 17 T .

If you never see a traffic light , try a 23 T .

Or get some better glasses . :mrgreen:
 
I went from a 19T to a 21T and for a reasonably aggressive ride with good cruise characteristics I'm happy with it.
 
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