I put the tach on my motor today. I was hitting almost 28MPH with a modified throttle return spring. Don't remember how many coils I cut out. 3 or 4 I think. With motor out of bike I am hitting 5060 RPMs. My conclusion is don't modify the return spring. I was able to adjust the governor speed by screwing the throttle stop screw back in. Have it adjusted at about 4K now. Will see how it dose when motor is back in the bike. Just thought I would share this for any one thinking of modding there return spring on there Coleman CT200U or any Honda/clone. I swapped the stock rod out for a BSP when I upgraded my piston and I only had about 30 minutes of good riding on the motor with the return spring cut and not much time on motor before that. Maybe a total of 1+ hour on a new motor with brake in and riding. The stock rod was already showing signs of wear from high RPM already. I did not check crank but rod has light scuff marks on it.