Smallest pinion on Emaxx w/10L and Ofna 51?

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Hi,
I have an Emaxx with a Feigao 10L with 14t pinion and Strobe/Ofna 51 spur. On my small track I can usually only run 1/2 throttle and it's a little hot so I would like to gear down. All Mike had in stock was a 10t so I ordered that late last week, but now looking at my tranny and motor I'm not sure if it will fit. There's not much room to move the motor over toward the tranny so I'm not sure it will move enough to take up the mesh on the 10t. Would a 12t or 13t be a better fit, or will the 10t actually fit once I get it? I know I haven't even tried it, but if it's not gonna fit I need to order other pinions soon so I can maybe be up and running for the long weekend.
Thanks!
--Jonathan

Oh yeah -- I'm running the G-maxx single speed tranny with Ofna/UE diffs and 40HD series Mashers which up the gearing a bit from stock.