Goat,
For me it's been the opposite...I've had a few that didn't ooze initially. Given a little time all of them have leaked at the case...some worse than others. The cases are extremely thin, especially the area that separates the crankcase from the countershaft.
I certainly can't go as far as saying that mbfire2003, definitely, doesn't have a genuine concern. It is, of course, possible that the gasket moved during assembly and there is, in fact, a void in the case seal.
mbfire2003,
These engines don't have a lot of compression.
If you can see the gasket all the way around the case; try tightening the case screws. They may in fact be loose, and a good tightening will likely resolve most of your problem.
If you do find any voids in the gasket, you will need to try and get the reseller to replace your engine, or split the case and replace the gasket. It was ridiculous for them to suggest that dirt will eventually seal the case.
It is just the nature of this hobby that you will have to work on the engine...sometimes even when they are new!
I have experienced these problems over the past 2 years:
Crank weights clocked wrong = baaaaaaddddd vibration.
The clutch gear bearings completely missing, or failing soon after the bike is built. On the ones that failed, the bearings look more like buckshot than bearings.
Loose fasteners...yes...case screws, cylinder head nuts...etc. finger tight!
Casting flash that partially blocks the intake.
Cracked carb floats...
Throttle housings that were poorly molded; causing the throttle to stick when returning to idle.
Petcocks that will barely pass fuel because the rubber seal bunches up against a poor die casting.
Chains that are twisted along the length.
Chains that are not the correct pitch.
Chains that are not of a consistent plate width throughout the length.
Bent sprockets due to a miss hit in the press.
Missing woodruff keys at the drive sprocket.
Fuel line that isn't fuel proof! ...It will shrink and harden soon after the build is finished.
And much...much more!
On a brighter note though...I have installed, messed with etc., about 100 of these and I would guesstimate that the above listed problems show up about 20% of the time. In other words...they're not all that bad considering the price.
Just know that it is likely you will need to check/do a few things in order to get the most enjoyment out of any kit.