My honda cr80 has lots of unburned oil leaking out of the exhaust head where the pipe connects to the engine. I tried replacing the seal twice and it still leaks out around the new gasket. The spring is tight and the bolts are tight. The oil smells/looks like it might have a little gas in it. The carb is squeaky clean and the jets are not clogged but it has a 125 main and a 50 pilot and I think it may be too rich. The problem is I have no idea what size my carb is to order jets.... It's a keihin PE but it doesn't say how many mm's it is.