picco .21 ks-r tuning
hello, i got a ? about one of my engine's a picco .21ks-r turbo . i have never seen this before . it act's like it quit's firing some time's when reving. a puff for the ext pipe but no fire or back fire that i can hear. im run 20%nitro hot plug , and tried a cold plug but the same thing. seem to run fine under a load. it has a 9mm torque carb. which im not the bigest fan of. anyways i have never seen this before. so any ideal i app it.