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Old P80 kerostart plug keeps coking up

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Old P80 kerostart plug keeps coking up

Old 07-28-2016, 06:45 AM
dorset john
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Default Old P80 kerostart plug keeps coking up

I have an old (Pre-SE) P80 with a kerostart conversion. The kerostart ceramic plug keeps getting coated in carbon causing poor starting. I clean the plug by soaking it in carburetor cleaner and it then starts perfectly for a few flights, then cokes up again. I am using kerosene with aeroshell 555 at 5%.
Any ideas why this keeps happening and what to do about it?
Old 07-28-2016, 08:02 AM
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I had exactly the same problem with the same engine and kero plug setup. I was using BP2380 oil.

Try using Mobil Jet II oil, at the same ratio. I found it reduced the "coking" a lot, and I hardly ever need to clean the plug. Maybe 2-3 times a year ?
Old 08-24-2016, 09:35 AM
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Never got any problem with mobil jet oil 2 and kero plug, try to change your oil
Old 08-24-2016, 01:06 PM
Dave Wilshere
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BP2197 or Mobil 2 will cure the problem.

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