means i agree about the tuning the motors tips are helpful but learning is the key and once you have it its all good i just mentioned about the fuel as i wouldnt really run anything less than 25% nitro and that the brand makes a differance aswell.....
my grp idles for ages when its all warmed up but my mates grp doesnt idle very well at all it had a air leak the o_ring on the HSP needle was not sealing.