RE: VQ Yak-9 as a racer
Typical Chineeze ARF look prety but not made very well.
All glue joints should be inspected and corrected... Firewall and Wing mounts are prone to fail with excess power.
four 1/4-20 nylon bolts for the wing (like the pylon reacers use) front dowels may not hold.
Toss out the supplied hardware and buy QUALITY 2-56 or 4-40 (Du-Bro Robart RocketCity Sulivan for example)