I've picked up this motor - has good compression - someone replaced the lower unit - will be checking for spark etc. I'm thinking about getting it up and running. The only obvious problem so far is it isn't changing gear. The gear shift lever has very slight resistance to it, as it moves back and forth, but the gears are not shifting. I haven't rebuilt a motor like this before, so I'm wondering what advice anyone has about diagnosing the gear shift issue.