89 ovation plug readings after complete rebuild

[O2viper700]

Just finished rebuilding an ovation 340, new crank seals, two new Pistons and rings and top end gaskets, Becasue it melted a hole in the mag side piston and I believe it was Becasue of the crank seal

after a heat cycle on the stand I took it around the field a couple times just taking it easy, let it cool and did that 2 more times. then went out for a little ride down the trails taking it easy but getting on the throttle more and more as the ride went on. Near the end hitting 1/2 to 3/4 throttle a little bit hear and there..
It seems to run good, how do you guys think the plugs look? This was in about -4 weather

The greyer one is the mag side. Also These are used plugs, but not the plugs it blew up with the mag side seems a bit grey to me compared to the pto

 

[Backwoods M Max]

Top plug has good burn in for a trail plug, the bottom one is a little rich but it's safe all the way around. May be rich on a warm spring ride but great for the winter by the looks of it.

 

[O2viper700]

Alright thanks! I thought they looked alright, hope it doesn't run to much leaner in -15 or -20. Is it normal to have on a bit greyer than the other? It seems a bit leaner on the side that burned down, I just don't want it to happen again

 

[northern srx]

That "grey" color concerns me but you said they were old plugs. Toss a couple new plugs in and test again. "Grey" leads me to think piston material deposited onto plugs...

 

[O2viper700]

It was driven probly for over an hour today, running really good and plugs still look good. I don't think it will get ridden anymore this season. I'll put new plugs in next season and see how they look. Thanks guys