When my '84 Tecates stator was going out, it would read in spec when cold. I'd start it up and when warm enough it would shut off and not start till it cooled back down. Replacing the stator  eventually fixed the problem, but I chased it around since the ignition coil was in spec cold. Moisture played a role in the stators demise, white powder like stuff would partially cover the flywheel exterior and the bare metal on the ignition/lighting coils would show signs of rust.

i will give you 100 for it. lol

After a quick google search it sounds like 90lbs is about what it should be. I'd be trying for electrical and crank seal problems

well your compression reading comes from after the piston has completely sealed off inside the sleeve,, a bad crank seal wouldnt have any effect on compression since by time you are building compression the crank seal is closed off from the compressing part of the compression stroke..... if that makes sense?

with the spark firing outside the wire it sounds like a bad plug wire. could be a nick in it or something and is causing it to short out

a buddy's little brother had a KFX80... has a governor in the carb itself. Goes between the slide and throttle cap, looks like a piece of pipe and it keeps the throttle from opening all the way. Long story short we pulled it out one day and then ran the bike and it was wicked fun! But then it just died on us out of no where after we TOPPED it out////  after you pulled the restrictors out of this 50, how much did you rev it? Could have over revved it and blown the seals again is what im trying to get at,,

Thanks guys. I will pull this apart this weekend and see what I come up with.  Hey Jack! It's good to hear from you. The lt80 work that you did for me is just awesome. The kid tears it up with that little bike!!

SOLD SOLD SOLD to the man in the front row!!!! 

Dang! I better start saving up.......

So I checked the stator and LH crankshaft oil seal. The new seal is right where I put it. Seals tight and doesn't appear to have any blow by. The LH seal seems to be a pretty common issue. I had one blown on my zilla and another lt50 I worked on.  What are the chances it could be a RH seal? Seams like the bearing would keep in place? Other than not starting, would there be any signs it was the other seal. I have not pulled the clutch cover yet and want to know what to look for. It appears the case has to be split to replace the RH oil seal.

I choked it again by placing my hand over the carb inlet.  This time when I pulled the plug it did not appear to be wet. Maybe it was residual gas before? I can feel a slight vacuum when my hand is covering the end and I pull the starter cord. I am getting a stronger gas smell, but the plug is not appearing to be wet now.  I pulled the plug and put my finger over the hole and pulled the cord. It has strong compression, but when I pull my finger away after several pulls it is not even damp with fuel.

I am chasing two separate issues with no real results from either. I also don't like throwing money at a bike without some idea it will solve the problem! Wish I had spare carb to try!!  I tried another coil and there was no change in conditions.

What all would I need to seal off on this little motor to do a leak test? That should tell me if I have a blown seal right? or at least an air leak. Not sure how you would do a leak test on one of these.....

Dude I've honestly tried my best to stump these guys.  I'm sure these guys can help ya build a cheap leak down tester and get it running again.  And more than likely someone who knows about these...is just reading these until you can do some trouble shooting to narrow the list of possibilities.