Sprockets

[Mikey82]

I have a 19 tooth sprocket on the front and 42 on the rear
Rather than have to remove primary side clutch etc, could i change the rear sprocket to increase or decrease the number of teeth to reduce the higher revs in top gear.
Anyone done this?

GF swinging arm model 1963

[neil1964]

If you want to raise the gearing (ie less engine revs per mph) then you need a smaller rear sprocket. Afaik 42T is smallest. If your speedo is right now then messing with rear sprockets will alter this.
Most people alter the engine sprocket as it does not affect speedo. Yes you have to remove primary cover and undo the cush drive but adding one or two teeth and extra link on primary is probably best option.