Hi all,
The 19 tooth sprocket that came with the bike is past its best and needs replacing.
Any recommendations for tooth count of replacement and supplier. I plan on riding back and forth to work in the summer 26 miles each way.
TIA
Scott

email (option): larkesrATgmail.com

i have NOS if u interested i can send photos
cheers
Hussein

email (option): sl_hussein@yahoo.com

Scott,
is it 19 tooth on the gear box or on the crankshaft ?

On the crank Michael

email (option): LarkesrATgmail.com

I believe it should be 19 on the crankshaft. And 18 on the gear box.

Or is it the other way round..?
And wouldnt be 2 x 19 be better, for just a little more speed ?

Hi scott

I changed mine to a 20t up front years back

The bike is a little slower in acceleration- every m20 is - needs a bit more down shifting on hills - my motor does need a top end rebuild - but my comfortable cruising speed is now 50/55

I was getting a lot of resonance at speeds near 50 - I lost some nuts & bolts off the bike as a consequence- but now the resonance becomes apparent only above 55

That’s just my own experience- if my Motor was in better order I suspect it would pull better on the hills - acceleration is not something you have an obsession with if you are an m20 rider

😊
Job

email (option): jonnyob1@googlemail.com

Yes acceleration would imply some sort of performance. M20's gain speed.:laughing:

Hmmmm,
Ok so a 20 tooth to mostly plod to work and back in the Norfolk countryside sounds about right then. As a rule all the tractors limit everyone to 50ish anyway!!
Thanks for commemts everyone, I’ll let you know how it pans out, motor is getting full rebuild, bearings, piston/rings/springs the lot.
Cheers
Scott

email (option): larkesrATgmail.com

Hi,

According to the manual 18T on the crank and 19T on the clutch. But I use 19T on both sides and work fine by me.

John

email (option): john.kater@chello.nl

Thats right, 20 is to big I would say.