I have a betamarine 10 engine which I bought used It would not start so my mechanic took off the starter and had it reconditioned. He found that there was sand on the cogs so he cleaned off as much as he could and replaced the starter. It went mostly ok last year but was intermitent this year and we put some oil in thru a small hole at the top of the flywheel casing. That seemed to help for a while and then it stopped working We took it out and found more sand on the bendix and cogs