I did about 300 of these, they are not ABC they are lapped ABN, made by Thunder Tiger for Global Hobbies, before the Magnum plant was built in China
They run well when setup properly , I B&B , retimed, and did head mods and made a true venturie and CL NVA.
The 45s and 46s ( same motor) were by far the best, the 40s are powerful and if you run it with no mods you will need to run a hi rpm wet 2 cycle
1/2 synthetic 22% oil 10 nitro works well, The 45 46s were as strong, or stronger than a ST 60 , and would run a perfect 4/2 , just a higher RPM 4/2 that people were used to
I still have a few motors and parts for these
randy