How now fouled plug?

[mpfine]

Any ideas about what caused this? I noticed the snorkel opening on the air filter was up againts a part of the frame blocking the air flos somewhat. Otherwise ... ?

[90GTVert]

How old is the plug?

What's the part number of the plug (curious about heat range)?

Is this pre-mix or injection? What ratio do you pre-mix or have you noticed increased oil consumption?

[mpfine]

Thanks for your help 90GTVert!

The plug in the pic is a NGK BR7HS the Jogs manual calls for a BPR7HS. I have the BPR7HS in the Jog now. Its electrode extends beyond the threads compared to the one in the picture.

I'm using the stock oil injection system. Oil is consumed. However only about 1/5 to 1/4 tank (0.84 Qt tank volume) of oil has ben used over the last four tanks of gas. I may need to bleed the oil pump.

Also the exhaust is a bit smoky. I suppose that means there's oil burning with the gas.

[mpfine]

As for the age of the plug. I can't say. I think it's the one that came with the Jog.

[90GTVert]

For now, the simple thing to do may be to change the plug of unknown mileage and see how it does with a new one.