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Old 18 February 2010, 12:59   #1
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Oil/petrol mix ratio

Can anyone tell me the correct oil/petrol mix ratio for a late 1980's Mercury 4HP aux. back-up engine?
Also correct spark-plug gap for the above engine?

Steve
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Old 18 February 2010, 15:37   #2
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Can anyone tell me the correct oil/petrol mix ratio for a late 1980's Mercury 4HP aux. back-up engine?
Also correct spark-plug gap for the above engine?

Steve
50:1. Not sure on the plug gap-what plug is it?
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Old 19 February 2010, 14:25   #3
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Plug Gap

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50:1. Not sure on the plug gap-what plug is it?
It's a NGK B7 HS
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Old 22 February 2010, 13:40   #4
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It's a NGK B7 HS
0.7mm (0.27" in old money)
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Old 22 February 2010, 13:58   #5
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0.7mm (0.27" in old money)
Do you work for nasa?
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Old 22 February 2010, 17:54   #6
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Do you work for nasa?
Someone lost a decimal point!
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Old 23 February 2010, 12:07   #7
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0.7mm (0.27" in old money)
sorry, 0.027"
yes I missed a decimal place....
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Old 23 February 2010, 12:08   #8
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Do you work for nasa?
depends what nasa stands for...
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Old 23 February 2010, 12:50   #9
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depends what nasa stands for...
North American Space Agency? they has some issues with metric-imperial conversion... which cost them a space craft and $100M
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Old 23 February 2010, 14:54   #10
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North American Space Agency? they has some issues with metric-imperial conversion... which cost them a space craft and $100M
Ah .. I didnt know that was the root cause ..
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