sum useful links when rebuilding a 122 rotax engine i uploaded in pdf gear box removal https://acrobat.com/#d=rPuXZtiR1ynah8iA5uayyg primary drive gears timing https://acrobat.com/#d=4I-5oZNjRTet-CDtSLacHg engine caseing split https://acrobat.com/#d=j-PrUo863cSVxSOf-SdNpg rotax 122 engine repair manual https://acrobat.com/#d=0GicIJmYuXVSTcxNbIugOQ top end rebuild https://acrobat.com/#d=eGMw4-aeuRmlzvha3E5YkQ