SOURCE: Motorcycle knock and blow-by (4 stroke)
hi,might be able to help,a compression test would be a good start,however,if you already have the engine apart,replace the rings anyway,if the engine has been overheated the rings although they look ok will have lost their tension and therefore their ability to hold sufficent pressure against the cylinder walls,therefore allowing blowby,or compression leakage,the other area i would look is the condition of the valve seals and seats,both intake and exhaust,if the engine has been overheated,the seals may have cracked or become weak,whenever i have my race bike apart with the head off i always relap the valves(just a light cut)and this ensures a good seal through the head etc,hope all this helps...cheers ian
SOURCE: 15.5 Craftsman riding lawnmower blowing oil/fuel
Hi, drain and change the oil as it has become contaminated with fuel. This is caused by your carby flooding while stored. Check and clean the needle and float in the carby and make sure it stops fuel flow when you hold the float parallel to the carby body. You can also fit an inline fuel tap to prevent this happening again. Hope this helps, regards Phil.
SOURCE: how to pull out pistons on subaru H6 3.0 2002
lack of compression
check the pistons and rings
one or both must be changed
SOURCE: What is the cause of back firing on deceleration on a 150cc Tao Tao scooter?
If it is a 4 stroke the valves need adjusted.
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