If you have a GX160 or GX200 for a cadet of prokart, give me a shout, I have upgraded 40 engines this year to the latest V12 MSA regs, and V13a for next year, I have an advanced 50hp dyno in my man-cave, can measure power, torque, mean/average-power and acceleration duration via lap-top control.
Can skim blocks & heads, hone blocks, new coils, 3-angle valve seat cutting, my son has won 15 trophies in the past year at Buckmore and Bayford. Other customer wins at Fulbeck, Wildtarcks and Stretton. I help out a lot of cadet and Prokart-teams, with either MSA engines or highly tuned open style motors.
www.KnighTorque.co.uk
Am based in Billericay, Essex if that helps.
Can also give a lot iof help with chassis set-up, clutch and gear ratio choice, as have been racing cadets with my son for 6 years.