Crankcase pressure coming out wire opening?

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Nashville Kat

Nashville Kat

Well-Known Member
Apr 20, 2009
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Jacksonville, Florida
Just noticed it on my 50- after replacing jug and checking for head and exhaust leaks- thought I felt something

and there it was- crankcase pressure coming out around the wires in the lower front section of the motor-
Is that at all normal?
Do you think it's affectring performance?
Should I try to plug it up?
 
Ludwig II

Ludwig II

Well-Known Member
Jul 17, 2012
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At least it's pumping out. Sucking in can cause the engine to run lean and then die.
 
MotorBicycleRacing

MotorBicycleRacing

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Jul 28, 2010
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SoCal Baby!!!
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Nashville Kat said:
Just noticed it on my 50- after replacing jug and checking for head and exhaust leaks- thought I felt something

and there it was- crankcase pressure coming out around the wires in the lower front section of the motor-
Is that at all normal?
Do you think it's affectring performance?
Should I try to plug it up?
Click to expand...
Not normal and the fix is to replace the crankshaft seal behind the magneto.
 
Nashville Kat

Nashville Kat

Well-Known Member
Apr 20, 2009
1,501
55
48
Jacksonville, Florida
Took the cover off and the magnet-

The seal doesn't look bad, but it just sits there very loosely- I took the chance to pack some grease into the main bearing behind it on that side, and packed the back of the seal with grease. I might doi it with the other motror if it seems to make a difference.

I also put gasket sealer around the outside of the seal and put it back on- I'll have to see how it goes- I'll probably order some seals in the meantime

Probably eventually put some putty around the holes where the wires come out through the cover just for sound dampenig- But I'll wait until I know the problem is fixed-

A little surprised at the ease of doing this- the little key on the shaft is tricky- not to lose- and I put it back in with needle nose pliars.
 
MotorBicycleRacing

MotorBicycleRacing

Well-Known Member
Jul 28, 2010
5,844
109
63
SoCal Baby!!!
www.facebook.com
Nashville Kat said:
The seal doesn't look bad, but it just sits there very loosely- I took the chance to pack some grease into the main bearing behind it on that side, and packed the back of the seal with grease. I might doi it with the other motror if it seems to make a difference.

I also put gasket sealer around the outside of the seal and put it back on- I'll have to see how it goes- I'll probably order some seals in the meantime

Probably eventually put some putty around the holes where the wires come out through the cover just for sound dampenig- But I'll wait until I know the problem is fixed-.
Click to expand...
The crankshaft bearings on a 2 stroke are lubricated by the oil mixed into the gas.
Greasing them is not needed and may lead to them burning up.
 
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