First off I thought spraying Seafoam directly in the spark plug hole wouldn't hurt anything. And yes I think the bike was somewhat carboned up from the oil misting into the intake then into the cylinders. When changing oil I went with the 3 1/2 quarts which I think is too much to begin with. But I followed the manual.
I also have the SE air cleaner which directs oil overflow (misting) back into the cylinders. I know have that fixed by taking the oil and redirecting it out, not into the cylinders.
I switched out the plugs last night, and will take it for a spin this morning. If that does not work I will pull the injectors and clean them.
thx
Don't pull the injectors, you can't physically clean them. You have to spray cleaner though them at operating pressure. It's usually done with them in place, using an adapter set up. Seafoam in the fuel tank will keep them clean.
103's do carbon up more than they should. I think it's a combination of what comes out the breathers, oil and vapor, and the high temps in the combustion chambers.
The dealers are pulling a lot of heads to scrape carbon these days.
When I replaced the head gasket on mine, there was a lot of carbon. Way too much build up a scooter with less than 15K on the clock. And it's never pushed enough oil to see any in the air box/filter. But there was an oily trail down into the throttle body. So I re-plumbed mine. Just closed the ports in the front of the plate, added a pair of nipples in through the side, and ran hose under the scooter. I used clear hose so I could see what it was doing.
One hose is darker than the other after 1000 miles. Not sure what that's about. But so far no actual oil has come out. Just vapor.
One of these days I'll fab out a little draft tube and mount everything up nice and neat. But that can wait till cold weather, what I have is working fine for now.
