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I feel like i'm missing something obvious because both the Gregory's and Haynes manual don't make any mention of this.

So factory timing for an EA81 is 8 degrees BTDC. On the flywheel there is a 0 mark going to 10 degrees on both an A and a B side. What side is before - TDC? Is A advanced and therefore before TDC, or does B stand for Before?

A $300 service and tune up with 02 sensor etc had my car at 10 degrees on the A side. Car has been running like shit and running rich. I changed it to 8 degrees on the B side, adjusted the timing and fuel mixture and first test drive its spinning tyres and going like shit off a shovel. Did i waste my money, or were they right and something else is wrong with my car and i've just set the timing way too advanced?

The A side is After TDC, the B side is Before TDC.

The A side is TDC to 10 ATDC, the B side is 20 BTDC to TDC.

You have set it at 8 ATDC, should be gutless, something else is wrong.

Set the timing at 8 - 10 BTDC.

And you have an O2 sensor?

Thanks for the reply Gary. I just edited my first post so yours will make less sense now.

The mechanics had it on the A side. This arvo i changed it to 10 degrees on the B side.

No i don't have an 02 sensor, half the point of paying for a tune up would be so they set the fuel mixture while using an 02 sensor in the exahuast.

I'd demand my money back if they set it at 10 ATDC.

Venom wrote: The mechanics had it on the A side. This arvo i changed it to 10 degrees on the B side.

I'd be asking for my money back if i were you.