Oil consumption

[Dmitry]

As I said, Olde expression "If it ain't broke don't fix it"

I am looked spark plugs. Watch this pictures. Thread of spark plugs in oil. What does it mean? I heard that it indicates on bad valve stem seals. What is your opinion?

[Howie]

Oil on threads?  No problem.  Plugs are too black though.  Can't tell from the photos, but if the carbon is dry and fluffy you are either running rich or your plugs are too cold.  Wet and shiny?  Oil.

[Dmitry]

Oil on threads?  No problem.  Plugs are too black though.  Can't tell from the photos, but if the carbon is dry and fluffy you are either running rich or your plugs are too cold.  Wet and shiny?  Oil.

Plugs are dry and fluffy. (NGK DPR8EA-9)
2 turns on carburetors.
Why oil on threads it is normally?

[Howie]

You are probably looking at anti seize compound on the threads.   Check your carburetor emulsion tubes (needle jets) for wear.   If they are oval, not round they are worn.

[R1racer]

I injected a tablespoon of oil into the spark plug hole and pressure went up to 175 psi from 150 psi. Your opinion: it means that the piston rings are bad? Or 25 psi it is not a difference to think so.
Sorry for my bad English

Yah that will happen in any ENG when you add tbl spoon of oil , Compression will go up and then it will go back .


Here is the Q what is the healthy compression PSI suppose to be per cylinder for your bike . Also there about 5% difference between the 2 pistons. Now lets say for example that the manual or factory spec indicate that you should have 180 PSI+ and you seeing that 150 then i would say there is a possibility you have worn out  oil rings .

Also do you have bluish smoke coming out from the tail ?

[R1racer]

Plugs are dry and fluffy. (NGK DPR8EA-9)
2 turns on carburetors.
Why oil on threads it is normally?

You have a little rich condition ..


What was the bike doing

[Dmitry]

You have a little rich condition ..


What was the bike doing

Thank you for the answers!