Does anyone know if the main crank bearing, the big on in the case, is sealed or open.
I ask this because on the Moki, the front gearcase is lubed by grease. Now, most people know grease in a gearbox is not really that good, because the grease will be slung to the sides of the case by centrifugel force.
In my Moki 400, I remove a pushrod and lifter from cyl #1 and remove a pushrod and lifter from a cylinder that is just below the centerline of the crank.

I add some 90w gear oil through the top lifter hole and when it runs out of the lower lifter hole the case has sufficient oil.
I discovered this early on in the life of the moki when I removed a couple of lifters and they were bone dry. Now with the oil added, I'm getting some seepage /leakage past the lifters so I know things are getting lubed.

Just curious to see if you think this would work for the 7-77 etc. If the gear case is open to the intake chamber then obviously this is probably not a good idea.

Cheers,
Dave.