Its a 1992, not a 1994. Sorry.

Hi,  I just pulled apart my 250 wheeler since I have had enough with pull starting it with all my might to start it,  and once it starts,  it runs for a bit, gets hot,  starts running worse, then quits and I have to let it sit for a while until it cools a bit, then pull the crap out of the pull start to get it to start.  

The starter doesn't turn it over fast enough for it to kick off.  The starter only produces about 55 psi of compression.  I can spin it over fast by hand with the pull rope.  (new rebuilt starter, operating correctly.)

OK,  that is my sob story,  here is my questions:  
The crank bearings are a little loose, the seals are worn out, so I figured I can change the 3 bearings on the crank with a shop press or even on my tool bench?  Is this possible to do on the bench or do I have to take it over to my buddy's with a press?

To get it out,  I hear to heat the case up without a flame heat gun and then gently tap the crank shaft to remove. Sounds like a good way?

My rod bearings are tight as can be,  so it will just be the main bearings I will be replacing.

The cylinder goods good,  the rings look like they are worn down quite a bit,  so I may just hone it out and install new rings.  How thick should the rings be?  Is there a service limit?

It was ran without an airfilter for a while,  before I owned it, so I suspect the rings are worn due to dirty air getting in it.  The engine does have some dirt in it, the spark plug was fouled out due to dirt on it when I first got it. (I got it a few weeks ago, but only put about 2 hours of run time on it. Never more than 15 minutes at a time though.)

On the oil pump side of the crankshaft,  does the oil pump gear press on after the bearing or is it one peice?  To remove the bearing,  I remove the gear first and then the bearing?  How do I get under the gear  to remove it?

thanks for all your help!  

your compression should baround 125-135 psi. for a 250cc polaris trailboss or trailblazer.

you should be able to carefully remove the main bearings as long as none of the lobes on the crank have to be pressed off.
these have to be timed and i wouldn't suggest removing them yourself.

just take it slow and easy and be sure not to crack the case.  

Thanks Wolf.  Am I right by assuming you mean the lobes have to be timed, not the bearings on the main shaft?  

yes the lobes have to be timed not the main bearings.

Welcome, always glad to help