17 replies to this topic

[Rubbershorts]

The vacuum adds more advance at part throttle for better economy and performance when cruising

For initial setup of the mechanical advance:
Remove vacuum advance pipe
Check the advance at idle, 2000, 3000, 4000 and record the RPM where it stops advancing.
Hopefully you’ll get something like your 5-10 at idle, then a max of 30-32 degrees at 4000 with no more advance after that

 

 

Is vacuum advance never measured then? And is that 45 degrees at 3000rpm, with it still attached, anything to be concerned about?

[timmy850]

You need to set the mechanical advance first. Once you know that then you can check the total timing with the vac connected.

 

45 degrees at 3000rpm sounds decent for cruising

[Rubbershorts]

You need to set the mechanical advance first. Once you know that then you can check the total timing with the vac connected.

 

45 degrees at 3000rpm sounds decent for cruising

Brilliant, cheers Timmy.