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 Topic: leak down test ?? 







poosterwyk

 
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leak down test ??

poosterwyk » Thu Nov 05, 2020 7:46 pm

Hi guys , when I started my MC28 in the Spring it spewed raw fuel/oil from the right side expansion chamber - yes you guessed it , carb float valve stuck.
Cleaned out carbs and reset the float height but I was seeing a light "white" haze from the right side chamber so became concerned and decided to do a "health check"
I just performed my 1st "leak down" test ( many thanks for all the threads ) and I am a little confused with the results :
when pressurizing the upper cylinder to 7psi , it held the full 7psi for 5 mins with 0 loss and 0 psi on the other cylinder
when pressurizing the lower cylinder , it also held the full 7 psi for 5 mins with 0 loss but there was 4.25psi in the other cylinder ??
Not sure if I have a problem or not with the centre crank seal ( or something else )
the bike starts with only a couple of kicks and runs OK
Any help will be appreciated
Piet Oosterwyk
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