Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Hi Paul,...Greetings from a M90
newbie & thanks for posting your M9 misadventure. I also experienced the loose flywheel issue. The speed govenor mechanicals really do complicate the grub screw access. I decided Not to mess with those microscopic sized E-clips (a disaster for sure) & just simply remove the lock-out bar pivot screw to slide the weights floating bushing inward. A lot simpler & no flying "Jesus" clips !!   Have you considered running less of
/ or a different type oil mix to reduce your spark plug & valve sooting issues as the "Instruction Manual" dosen't address any lubrication steps but just "gas it up & go" !  The M90 seems to run a lot  colder than other engines & just never gets hot enough to burn off normal 2 stroke gas mix lubricants. On the o-ring issue, does the cylinder sleeve bore have a starting chamfer at either end to reduce o-ring damage during reassembly as the very thin & fragile looking rubber o-ring looks to be a frequent wear & tear issue even at the heavy oil mix you're using..Thx for any info, tom.