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which glow plug?

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It all depend on the percent of nitro you are using if its 10 to 15% use a hot plug,20% medium plug ,30% cold plug, I had that same plug in my T-Maxx and was using 20% and it wouldnt run very well and was hard to tune it in. I have heard McCoy are good plugs just make sure you get one that will work best with the % of nitro fuel you are using good luck :cheers:

Jesse
 
I think the McCoy 59 is similar to the OS A3. They are both hot plugs. With the smaller engines (.15-.18), IME they like the hotter plugs with 20% nitro. Although, the OS 18 I have likes the OS #8 plug (medium temp) best so far, but I haven't done more than break it in. It runs nice and smooth though.

My OS 15 cv-r(x)'s liked the A3 plug and so did my Orion 18. All running 20% nitro. My 21's (os 21 rg and Omega 21 Comp) like the #8 plug with 20%.
 
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