Hi guy's, I have a few questions that id need awnsered , but first here's the run down , I bought the 1992 lt250r running, ran it for about 3 hour then i felt like something was wrong with it , It didn't have that zap and power i had reed about so i did a compression test , came up with 120psi , not good So i went a head and pulled the motor and got the cylinder bored , new wiesco piston , billet thrust washers for the wrist pin , and the 1999 rm250 bearing and a gasket set with oil seals. so this is where i'm at now got the engine in pieces got the clutch cover off and all.
So here are the question:
-First off Is it possible to change the crank seals without splitting the case?
-second when i got home with the bike i went for a ride , (it was bogging real bad so i cleaned the carb took all the jets out check the set and needle etc.. ) then put it back together , put a uni pod filter on the carb (bypass the airbox , since the filter in the airbox was really crusty and old ) , ran the bike but now the rev would get stuck and rev high then go back down, Wondering if this is because of the uni filter , the carb pulled to much air ?

I've been stop for about 2 weeks because i'm really not sure . I don't want to waste a set of gaskets to put it back together and leak down test it and have to take it apart again to change a seal , but i also dont want to invest a ton of cash into it , ( also a small note the crankshaft part where the water pump impeller sits on the shaft had broken i guess so they welded it up but take the nut too so not sure what to do about that )

anyhow any help, advise would be good

 thanks Guy's

the motor rev sticking is b/c its going lean. not a correct a/f ratio. and i have had to weld a nut like that on a zilla. and it was a major PITA to get it off. a cut off wheel and and some patience. i than used a rethreading set that has thread files and cut the threads back in the crank snout to get the nut off. than had to get the crank rebuilt.