Hi Jeff, I have never taken any real interest in the decop valves they either worked or they didn't . The first 24 I had with a with a PT was the yellow one and that was the one with the odd noise. Never found what it was but it had to be something with the belt/bearing/blade carrier because I swapped 3 motors on that one and the third motor was the one that made the least noise. It was still prone to the kickback but it wasn't too bad and I haven't heard from the bloke who got it so hopefully all is good. Next one was a red one and that suffered badly from kickback and difficult starting. That one wasn't mine it was just one Big Ted had referred to me to fix it. I swapped 2 motors on that one and got it reasonable but it still was prone to kickback if it didn't want to play ball. The bloke sold it shortly afterwards and wanted me to build another one with a 4 stroke on it. I didn't build one because the cost of a new 4 stroke was going to be too costly.I also had a grey one but I ended up putting a full crank on that one but I had to make up an adapter plate for it and that caused a few problems with the F/C bolts clashing with the PT slots in the base.Wouldn't bother going that way again. Then I have the current one , I do want to try a modified carby on it to see if that improves the starting ( it is taking 3/4 pulls to start it) but with the restricted decomp it has not kicked back once so that is what causes that problem
