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Fixing bike creates more issues

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Finally changed out my right sided crank seal this weekend on my 93 RM 250.

It was a hard start and blowing smoke before I did it. Changed all the seals I could on the right side, kick start, water pump, new gaskets, oring for clutch, etc.

Question:

Fixing a right side crank seal leak, would after fix your bike seem to have more compression because you stoped the air/oil leak? Just wondering as it seems harder to kick over (maybe its just me).

Also when I fixed the seal, when I fired the bike up (after several mins/tries) it died after start up. Tried starting again and no go, so I took out the plug and it was black. I had inspected the plug a few times when riding it before the crank shaft seal change and it was always grayish/looked good.

Would replacing the worn seal with a new one change anything to make me foul the plug?

i put a new plug in and it fired right up first kick....drove around the yard for a while and came back in to change out the warmed oil. I tried firing it6 up again after I shut it off and no go. took out new plug and it was not as bad, but headed to black so I cleaned it up and the bike fired 1st kick.

Any ideas? on either thought (gained compression/fouled plug) after right side crank seal change...or am I just goofy...lol

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It may be that you just have to rejet since there was tranny oil affecting the jetting before, or you you put the seal in the wrong way.

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