Installed 'S' cams into the Harris Scrambler. The head is stock and as with many stock AVL heads the valve seats are not flush with the combustion chamber. I had intake valve to piston interference because of the seat not being flush. To remedy this without machining the seat flush, I timed the exhaust cam to the timing marks and the intake cam one gear tooth retarded. The bike runs very good. I'm getting more RPMs out of the engine, don't know just how many, I don't have a tachometer, but I can make 75 mph in forth gear and 80 mph in fifth with the cycle as you see it. Not only am I able to get more RPMs and a little more top speed, I also have very good low speed throttle response. The only performance modifications to the engine are: 'S' cams, 30mm PWK flat-slide carburetor with K&N pancake air filter, and a free flowing, upswept exhaust with the Indian made classic short silencer. The bike is also running stock gearing with a 18" rear wheel. I'm very pleased.