I worked in a metric bike shop in the early 80's. It was 20 miles to the nearest town.What are your thoughts on using MMO (marvel mystery oil)?
Every now and then, a brand new bike would just "lock up" before it got to town. The story was that the tolerances were so close that some uneven heating would occur.
Some salesman showed up one day and was peddling Marvel Mystery Oil. Short story is that we started putting two ounces in every tankful on a brand new bike - and we never had another one "lock up"
About a year later, we substituted an couple ounces of 2-cycle oil, with the same results.