XRAY - Model racing cars

It sounds that you are way to rich. or have you installed the new 2 pice exhaust?

If you have the option 2 pice exhaust first try to move the pibe closer to the header.

if you don´t have this exhaust then first start by turning the main neadel 1/2 turn ccw hgow does the engine react? eaven more slower in acc, then turn 1/4 cw, it this helps keep om turning cw 1/12 turn until engine runs clean from the bottom.

when it starts to reacts from the bottom as you want, notice whats happen when you goes off the gas an bring the engine to idle, does the idel speed increase after a few seconds or does it fall? if it´s increases rpm then loosend the low speed neadel 1/2 turn ccw. open the throttel fully and bring it down and check again if it´s still increases rpm after a fed second 1/4 ccw more. open throttel again and bring back to idle if it now stands for a few seconds and then decreases rpm then you should turn the neadel 1/8 cw. repeat this ajustment until your engine idles stabel for 15-20.

today I had the same problem with my enginne as you have.
the weater had since last time I drove becom much better with a raise of 15 degrees C. I had to turn my main neadel more than 1/4 of a turn cw and re ajust the low speed neadel compleatly b4 it was turnde in to this new hot weather. ( it suppriced me a bit that it was this much I had to ajust b4 it started to run perfect and don´t stall on me. befor tuning it the engine stalled every time i opened the throttel fully out of low speed corners.)

hope that I have helped you a littel .

/ Kenn

Idle hard part. Like it to idle 0-1sec. And slightly rich on idle adj screw. Cuz the first 1/4 throttle you want it rich. Pass a 1/4 throttle it will lean out from your main screw adjustment. Off a corner u'd like to see a sec of smoke coming from tail pipe an disapate. Remember to run a couple of laps to stabilize the temp. Too lean on idle can cause stall out or Flame out. even a flat spot. Dont always think main adj, look the transition from idle to full throttle. So, be patient!! it is tricky. But u get it right!!! Nobody will touch you!!!