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TR2/3/3A TR3A Plug Gap?

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karls59tr

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What is the prefered spark plug gap .025 or .032 ? I'm going to run the NGK BPR5HS (a little hotter than the BPR6 to see if it will cut down on the carbon fouling). I have 87 mm pistons,Pertronix ignition,mild street cam and a header. Doing the Spring tune up today. :smile:
 
If it's really carbon rather than oil, then IMO you have a mixture problem rather than a heat range problem.

I run .025" as per the book. Tried .032" (along with a MSD 6) but it didn't seem to help at all; and IMO the higher voltage allowed by the larger gap makes the cap & rotor more likely to fail.
 
Get the mixture straightened out. The fives are a cover up, in a worst case, potentially a costly one.
 
Well actually I rebuilt a set of SU's over the winter that I will be installing soon so I appreciate what your saying about the carbs and mixture. I think what was actually happening was the mixtrue nut was stuck to the lower jet bearing on one or possibly both carbs so I wasn't able to do proper adjustments. The rebuilt SU's should take care of that problem. I'll probably leave the NGK 6's in untill I have the carbs installed. I was just wondering what other "3" owners were running for plug gap?
 
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