Re: TR6 spark plugs

[d spence <dspence@oanet.com>]

Anyone on line??
I went shopping for TR6 plugs today and picked up what I thought what 
was correct. Champion copper plus RN9YC. Get home and the old ones and 
other sources say N9YC.... no R. Does it matter? Have Champion changed 
their number system? Does R indicate a heat range??

Please reply directly as I am on digest and I need to know "now".
Many thanks.

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