- Wed Jan 26, 2022 8:54 pm
#99830
The only Twin i have that i can't remove the oil cap while eng running is the mk1a without copping a faceful of oil.Re the over pressurization,i did a test many years ago by drilling a rocker stud and attaching a plastic tube up through a loop and added some oil,marked off both levels and tested original and reed valves etc you can do the same there's conclusive results to be found.