Check valve

Energy One
mleach72

mleach72

Well-Known Member
Oh, in that case, then yes the check valve should be in there. If the front breather is hooked to the manifold or carb vacuum port, there will be an intake leak without the check valve.
 
C

Chaney

Member
Ok front is running from front to intake and the rear is from back of breather to the rear cylinder and theres no check valve in the hose and i seen where it said the front sucks and the rear blows so if i have breather off and bike running i should be able to put my finger over the hole and it should be blowing right well i did this and the back hose is sucking
 
mleach72

mleach72

Well-Known Member
Chaney said:
Ok front is running from front to intake and the rear is from back of breather to the rear cylinder and theres no check valve in the hose and i seen where it said the front sucks and the rear blows so if i have breather off and bike running i should be able to put my finger over the hole and it should be blowing right well i did this and the back hose is sucking
Click to expand...
Yep, you definitely have a vacuum leak. The front breather keeps a vacuum in the engine. The check valve keeps air from being sucked into the motor. This valve stays closed nearly always. The only time it would open is if there was a sudden burst of positive pressure, i.e., a collection of unburnt fumes in the crankcase suddenly ignites.
 
mleach72

mleach72

Well-Known Member
Hmm, I'm not sure. I never bought one. I would think an auto parts store would have them. If not, I'm sure you can get them online somewhere. Ebay? Just figure out what size hose the breather is.
 
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