I got a used Lazer Z and the RPMS where low and the engine just wasn't running right. I did a well needed tune up and rebuilt the carb. Upon re-installation of the throttle cable I noticed at full throttle the butterfly valve isn't open all the way. I usually adjust the throttle cables so at full the valve is fully open but with this engine thats not the case. I put a tach on it to see the rpms and I adjusted the idle to 1500 rpms (after warm up), I adjusted the low needle (i replaced the old one) and at full throttle I was only getting 3400 rpms with no load. I adjusted the governor up a notch but it didn't do much. If I pull the linkage on the carb I can get the rpms up but the linkages where the throttle cable attaches to are at max. Any idea how to get this engine to purr as it's supposed to? Does the butterfly valve on the carb not open fully at full throttle? The Model engine is CH25. I'm going to print out the service manual tomorrow when I get to work but wanted to get your input on this. Thanks.