Oil/gas drip from exhaust port

[VermontCruizer]

I recently noticed that I have oil or gas/oil mixture leaking from the exhaust port where the exhaust pipe attaches to the engine. It's coming from that joint and dripping onto the bike frame........just a few drops but it is leaking.

Does anybody have any ideas what is causing this and a possible solution? The engine continues to run well, is fully broken in and and I am running a 25:1 fuel mix. Thanks!

 

[Bikeguy Joe]

40:1 mix, new exhaust gasket.

Check your plug and make sure it's not running too rich (air/fuel mixture).

 

[shwnrttr]

25:1 is too much oil. one of my kits had a pin hole leak in the weld at the flange so make sure its not the weld. if not, get you a gasket. i make my own out of heavy duty aluminum foil a couple of sheets stacked on each other works every time.

 

[VermontCruizer]

What gasil ratio should I be using?

The engine is fully broken in (over 400 miles on it) and I was just following the assembly instructions that said after break-in go to a 20:1 so I thought 25:1 would be OK.

 

[shwnrttr]

40:1 is good

 

[Bikeguy Joe]

The instructions have been wrong for YEARS.

24:1 max for break in, then 32-50:1 after depending on the oil you choose.

Personally, I break in and run the same mix- 40:1 Penzoil. Never had a failure.

 

[VermontCruizer]

Well, I did 16:1 for the break-in.

No wonder I have a carbon crust on the piston and spark plug!

I will switch to the leaner 40:1 mix and replace the gasket. Thanks for helping me with this issue.

 

[VermontCruizer]

I switched to the leaner mix of 40:1 and also sandwiched the existing gasket between two pieces of heavy aluminum foil cut from the bottom of a disposable aluminum pie pan.....the leak seems to be gone now! it even seems quieter. Thanks for the gasket idea stacshwnrttr and bikeguy joe for the help.

 

[Bikeguy Joe]

You are most welcome sir.

 

[maniac57]

Check the exhaust pipe studs every few rides. Motor mounts too! These engines shake bad so a little preventative maint.goes a long way. Don't overtighten and strip though...just check 'em regular. I've used 40:1 for thirty years with no issues. Use good quality oil.