Need help with Saito 125
I bought a 125 and put in a CG Ultimate after blowing up an O.S 120 pumper due to a ceased fuel regulator. I broke it in rich using 15% nitro and 18% syn oil. after leaning it out abit i throttle it up slowly it almost sounds like it backfires and quits after 3/4 throttle. the needle is set 4 turns out but there its not behaving like its too rich, throttle response excellent and no smoke any suguestions? After that I pulled the plug to check its color and I gulled the top of the threads in the head and i was thinking about chasing them with a tap, what is the thread size for the glow plug?
thanks for reading
Get 'em up and down is one peice