1980 GS 850G pistons

[Steve]

If I remember correctly, your octane numbers run higher than ours.

I forget which is which, but our numbers are an average of the research method and the motor method.
Your numbers are only the higher of the two.

.

[49er]

If I remember correctly, your octane numbers run higher than ours.

I forget which is which, but our numbers are an average of the research method and the motor method.
Your numbers are only the higher of the two.

.

That's right Steve. Our ratings are Research Octane Number (RON) which is higher than Motor Octane Number (MON). Your ratings are an average of both, called Pump Octane Number (PON).

Your PON rating of 87 is equivilant to our RON 91. So I guess that I have been running your 87 octane in my 10.5-1 engine without too much drama!! We really do need to compare "apples with apples".

[salty_monk]

In the UK they have 95, 97 & now 98 & even 102 I think

Used to be 2 star or 4 star

[49er]

In the UK they have 95, 97 & now 98 & even 102 I think

Used to be 2 star or 4 star

The UK rates their's in RON too.