Oil leak. Any ideas?

[Pancakes]

There is a rubber plug/cover on the head of my GN250. It's on the right hand side just behind the tacho cable. There are no joins that contact it, it looks like it just bungs up a hole that might be for inspecting/adjusting something internal. Anyhow, it leaks hot oil onto the block and that smears all around the place at speed and gets on my pants. I don't want it to catch fire either (is that possible?) if the engine gets hot enough. Does anyone know what that rubber bung does and if they are easily sealed up or replaced? Thanks for the hints I've gotten from reading the other posts and old threads in this section too! Lots of wisdom, now all I have to is not break anything! Later.

[Big Dave]

There is a rubber plug/cover on the head of my GN250. It's on the right hand side just behind the tacho cable. There are no joins that contact it, it looks like it just bungs up a hole that might be for inspecting/adjusting something internal. Anyhow, it leaks hot oil onto the block and that smears all around the place at speed and gets on my pants. I don't want it to catch fire either (is that possible?) if the engine gets hot enough. Does anyone know what that rubber bung does and if they are easily sealed up or replaced? Thanks for the hints I've gotten from reading the other posts and old threads in this section too! Lots of wisdom, now all I have to is not break anything! Later.

No it won't catch on fire - just unsightly. Take it in to holeshots or somewhere and it's probably a minor job.
or put triumph badges on it and relax.

[Pancakes]

Thanks for the answer Dave, I's thinking of putting a restrictor in and selling it as a classic, hehehe. Do you think there is some sticky crap I could just gum it up with? Do you know what that hole does?

[rfc85]

i'll have a look at mine tomora and see if i can help out with what it does,too dark an the beer is too sweet.

[loosebruce]

You could always use, Salastic (sp) a gasket sealent, if you are really unsure about and want a second opinion you can bring it round my place and i can have a look for ya, am home all day Saturday and free during most of the week.

Will PM you my Cell if you need it.

Cool

[DEATH_INC.]

Yeh,you could do the sump plug too,then he won't have to worry about oil leaking from the head.....

[thehollowmen]

Give me a sec..
I'm slowly scanning a GN250 service manual here so... I'll look it up for you

[thehollowmen]

is it about 5mm in diameter on the rear right hand side of the engine below where the tacho cable joins? If it is, that would be the cam chain tensioner... it it is about an inch in diameter, and below the tacho cable on the right hand side that covers the bearings for the cam...

email me and I can send you some service manual pics I've already scanned.. they are huge and I'm trying to put them into a pdf but the scanning is the important bit atm

[FROSTY:Me]

Bring it round here and Ill sort it out for ya. I think from your description its a cover gasket of some sort.