i've just installed the 80cc gilardoni reed valve kit on my 80 mk2 and i got it running with rigged up carb and intake. i did not ride it knowing that the carb is too small , but i did let it idle and the engine seems chingy sounding. i have a 21mm dellorto coming so i won't ride it til then. i did pull the plug and rolled motor over by hand and nothing seems to be hitting. could it be detonating at idle? or are these engines noisy after they are modded? there is only 2500 miles on it and the engine was very clean internally. any suggestions would be much appreciated.