[AT] spark plug gaps

[sledride]

the wider the gap on plugs gives them a hotter spark
----- Original Message ----- 
From: "Cecil Bearden" <crbearden at copper.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Friday, January 25, 2008 12:07 AM
Subject: Re: [AT] spark plug gaps


> This message never made it to the list, so I will post it again.
> 
> 
> Maybe we have cussed and discussed this before, but I had a problem
> a couple days ago.
> 
> Guy called me up 9pm Saturday night wanting my 15KW ONAN generator that
> is on Ebay.  He would be there yesterday before noon.  I got it running,
> had to put in new battery and the spark plugs were not hot enough.
> Seems that manufacturer specs are for D-9 champions, but takes D-16 to
> fire this unleaded gas. It is a continental f186.  Got another
> continental y69 in a forklift that had D-23's in it and it started
> missing trying to move another generator it would not even untrack
> itself.  I took the plugs out and cleaned them and had the same
> problem.  Took them out again and re-gapped them to .045 and it ran
> fine....
> 
> Do we need to run .045 gaps with unleaded gas?  Do I need to start
> running pertronix ignitions on all my old engines?  Or just convert them
> all to propane?  I had a 4 cycle dip in the generator current when I hit
> it with a 10KW load to set the frequency.  My new 15KW Onan only had a
> .5 cycle dip with the load.  I now wonder if I would re-gap the plugs to
> .045 would the response be better and have less frequency dip.?
> 
> 
> 
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