um, you cant make it go into reverse mate!! its a mini truggy, they have a centre diff, you need a gearbox to make it go into reverse, and thats monster truck territory. pushing the throttle forward will only apply the brakes. Try a McCoy MC9 plug, they work well in them. plus yours is still in need of breaking in, so it will run rich anyway. after a few more tanks, start leaning the engine in a bit more every tank. do some half throttle blips, building up to full throttle short bursts. dont forget, you cant tune a cold engine. what may seem rich when its cold, will probably be leaner when its upto working temperature..