Oil leak from head

emto · Post by **emto** » Mon May 31, 2010 5:13 pm

I noticed today while changing plugs that my front cylinder head has developed a leak around where the gasket seats. Its not spewing or anything just an oily deposit (for now).
Would this cause a compression drop on those cylinders?

Post by **skinnydog0_0** » Mon May 31, 2010 6:26 pm

how much oil do you mean? Is it on the surface around the gasket joint, or is there oil running from the gasket?
Do you have a pic?

emto · Post by **emto** » Mon May 31, 2010 6:31 pm

No, its only around the gasket surface, externally. Sorry don't have a pic.

Post by **skinnydog0_0** » Mon May 31, 2010 6:40 pm

Mine looked like someone has smeard a line of oil around the gasket and there is a little line like a dribble, but just on the surface. I just think it is the gasket absorbing some of the oil and passing it out. Has the performance changed?

emto · Post by **emto** » Mon May 31, 2010 7:10 pm

Can't really say about a performance change, just goosed my plugs over the weekend.
But prior to that, I had a dyno done and was surprised at the low BHP result (50)
That's why I ask will it affect the compression?

Post by **skinnydog0_0** » Mon May 31, 2010 7:48 pm

What set up do you have? Exhaust, carbs CDI?

emto · Post by **emto** » Mon May 31, 2010 7:59 pm

I have 120 jets all round, standard induction with a half Ethos system with a Tyga C/F race pipe (no baffle). Its a road bike.

Post by **skinnydog0_0** » Mon May 31, 2010 9:00 pm

When you say goosed your plugs, do you mean they were knackered, and you changed them?
If they were in the engine whilst on the dyno, that may cause a slight drop in power.
I am sure that someone will correct me if i am wrong, but i dont think you would get any more than 60bhp with standard engine and exhaust. so if the engine is a little tired/done lots of miles and the spark plugs are a little worse for wear than i am guessing that 50bhp is about right. Did the dyno guys put the 120 jets in or did you put them in?
Is this an NC30?

Old Painless · Post by **Old Painless** » Mon May 31, 2010 10:00 pm

Is the oil leak at the cam cover gasket or head gasket ?

If its the cam cover gasket take the cam cover off, clean the surfaces and apply a smear of gasket sealer all the way round the mating surfaces, job done.

emto · Post by **emto** » Tue Jun 01, 2010 8:19 am

afraid not ,its the head gasket. ita a NC30. I did all the set-up myself before the dyno run, maybe the plugs were on their way out, but the question is, will I be losing compression with the leak?

Oil leak from head

Oil leak from head

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