Originally Posted by
mattwoodcraft
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.
Got up this mornin and pulled motor back off buggy and performed air leak test. couldn't sleep

. found no leak around needles but removed, inspected and greased o'rings anyway just to be sure. Did find that front bearing was passing air but sort of expected that after reading this thread. We'll see today if it's enough to muckup idle. Note I run the motor yesty arve and did not oil motor when finished so there would be very little residual oil in there to take up any seal in the bearing. Did you buy your TKO's from the US. How much of a pain was that and how long did they take
Does anyone know where u can get ceramics for the GRP 21 tuned in Australia.