Scooterotica

whats the best set up with the pacemaker box li150 at 4.9 is 16x46 the pacemaker is 5.65 how do I get it to 4.9 also I have the small tooth 3rd gear so if anybody has a spare larger tooth 3rd for sale I am debating fitting mugello 195 or rb 20

The later (stronger) Pacemaker 3rd gear does not mesh with the earlier xmas tree (cluster) so buying a late loose 3rd will not help you.

thanks for that adam

No problem, glad to help you avoid wasted expense.

I learnt this a number of years ago when I bought an early Pacemaker box and didn't count the teeth pre-purchase. It turned out that 3rd had been replace, probably as the result of breakage, with a 3rd from another box. I tried to fit a later 3rd but it wouldn't mesh correctly when assembled in the motor/ Unfortunately, the substitute loose gear resulted in there being a big ratio jump between gears (different no of teeth on the loose cog) so it meant that the ratios went from good to poor.

Adam

17th front sprocket and a new chain will give you 4.98:1 which will give you 10.2mph per 1000 rpm.
61 mph at 6000 rpm.

thanks chris 46.17 would that be an 82 chain

its ok ive just looked at the gear calculator its an 81 chain that will work ok thanks its abig jump from 5.65