This is the "heart surgery" section. The Yamaha DT 50 LC engine is a masterpiece of port timing, but it requires precision during a rebuild.

: Separate lubrication system using 2-stroke engine oil.

: A direct PDF of the Yamaha DT50LC Owner's Manual is available via Semestergas .

Do you have a link to a clean DT 50 LC manual? Drop the source in the comments below to help a fellow smoker out.