Topic: loss from cam head breather

[_mark]

Hi guys.
Is it normal such loss I have from the breather of the head of the engine?

That is a huge amount.. and is going to dirty everything in my bike...

Thanks bye

[Don R]

 It looks like a lot, tell us about the bike, how many miles, has it been sitting for a long time or in regular use? Does it foul plugs?  Regular maintenance?  If the cylinders are cold it could be worse than warmed up.

[pjlogue]

do a compression test.  Looks like you are getting a lot of blow by past the rings.

-P.

[_mark]

It looks like a lot, tell us about the bike, how many miles, has it been sitting for a long time or in regular use? Does it foul plugs?  Regular maintenance?  If the cylinders are cold it could be worse than warmed up.

I bought the bike last year but the mileage, origin, etc is unknown.
I use it 2-3k km/year but it has been stopped long time (years) in a garage.
bike was in hot condition during the video.
Spark plugs are in good condition (colour is ok , is hazelnut color)
Thanks

[_mark]

 
what is the correlation between this loss and a por compression ? thanks

[pjlogue]

what is the correlation between this loss and a por compression ? thanks

The high pressure gasses in the combustion chamber gets past the rings and into the crank case where it exits via the breather tube.  If the rings aren't seated on the cylinder wall or the rings are really warn this can happen.  If the bike was stored for a long time the cylinder walls could be pitted from rust and the rings aren't seating properly.  It "may" get better with putting time on the engine and the rings will re-seat.  Do a compression test.  Remove spark plugs and test each cylinder with turning it over with starter until pressure reading won't go any higher.  Record each cylinders reading.  If a cylinder is low put some ~30 W motor oil in the spark plug hole and take another reading.  If the compression goes up significantly it's the rings that are leaking exhaust gas.

-P.