tag:blogger.com,1999:blog-5415584649217620448.post1853228467970755006..comments2021-07-09T05:43:57.405-07:00Mikehttp://www.blogger.com/profile/17227485615141686252noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5415584649217620448.post-5780901698061378682021-05-19T22:43:45.771-07:002021-05-19T22:43:45.771-07:00Hi, sorry for the delayed response. I don't have a specific recommendation and suggest that you do a search on the web and you'll find recommendations on specific methods you can follow to break in your new engine. For myself, I don't tend to follow a specific regimen when breaking in a new engine, but I do try and vary the load on the engine and avoid long sustained periods of running at a specific speed. After a few weeks I'll change the oil and call it good. This approach has served me well and while I'm sure there are people would love to debate what the best approach is, my general recommendation is to ride your bike, don't get crazy, and after a while change the oil and you should be fine as these are very forgiving engines.Mikehttps://www.blogger.com/profile/17227485615141686252noreply@blogger.comtag:blogger.com,1999:blog-5415584649217620448.post-69461408248567217262021-01-24T19:46:57.624-08:002021-01-24T19:46:57.624-08:00Thanks so much for this step by step information! What do you recommend for the engine brake in period? My son is almost done with his rebuild and did the same Dr. ATV big bore (53.5mm) piston.younglife adventureshttps://www.blogger.com/profile/10614803209275189633noreply@blogger.com