Ive got a saito 90, about 1 gallon of fuel through it. Every 3 flights I have to adjust the tapped because the gap is too big... Done this 6 times now,and there is no further thread left to adjust further!!!! The pushrod has shortened (I think) to the pon that it barely protrudes into the head!!!

WHAT THE HECK!!!???

Ive never seen this before. Im taking it back to the hobby shop today. What can explain this strange behaviour!!!???

Im worried there might be some burr on the cam, and perhaps it is grinding down the pushrod? If thats the case, there were likely metal particals floating in the crankcase...

Anyone with input?? I figure I should get a new motor, no?

The other pushrod has never needed any adjustments.