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A great looking pair... and as usual, Mr. Spears hits the nail on the head.
But for the break - in period and for the initial tune-up, I'd say be conservative and run the default spring. I doubt...

I'm being cautious... I'd say start small. Again, I don't know the fuel that is available.. Then work up and play it safe.

Welcome Aboard CHR... (pun intended!) Nice to see you here.
The default (Silver) spring will work fine. As a base setting. If the fuel available to you can support more timing, step up to the...