What timing?

[Shipleystevep]

Just finishing rebuild of a 69 bog stanbdard GP125 engine, all as it was except new bearings seals rings etc, still on 6 volt points. Where abouts should I be setting the timing please? Book says 21 degrees but what should it be with todays fuels etc. my kitted scooters (mugellos) are at 17 degrees.
Cheers steve

[Grumpy225]

Totally stock, you should be OK with 21 but if you wanted to play it safe go to 19 and call it done.

[Chris in Margate]

And use highest available octane.