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I attached two pictures showing the plugs that are getting pushed out. Let me know if anyone knows whats causing this. Thanks.

Yeah, I think you are right. why is it blowing these plugs out? I'm at a loss on this one. Thanks for all the replies.

I took the cover off and your right. This time if blew one all the way out and it is rubber gasket seal. They seam to be pressure release ports, if there is too much pressure in the engine then it will blow the plugs??? If this is true then why am I building too much pressure? As I twist the...

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Oil leaks from two rubber plugs behind the crankcase cover. I took a rough 1980 XS400SG and tore it down cleaned it up re-painted most of the chrome put it all back together fired it up sounds good revs good; got all excited and went for a ride came back and parked and noticed several fast...

Thanks! That's helpful. I will go with the 3F8 12/79 info.

According to Skillzman1's post earlier my bike is either a XS400SG or a XS400H. My Vin# on the frame and engine is: 3F8-024365 The label on the frame shows 11/79 as the manufacturers date. According to the chart I have mixed information of what model my bike is. 3F8 was made in 12/79...

My vin# is 3F8-024365 manufactured 11/79 I know it's a 1980, but what model letter is it? XS400H Or is it something else? XS400? Thanks to who ever knows the model letter after the 400.