Re: High pitched noise
Sometimes the clutch gear will rub on the case on the right hand side. Pull the cover off and look for metal shavings and put a dab of grease on the gear if it is dry. I also put grease in the hole that hold the clutch cable under the carb. Unscrew the fitting and put some grease in there, I used a neddle to get it in cause it is tight....Also really no need for high octane gas since these are low compression engines.