Carbon
Club Member
Joined: Mar 2009
Posts: 66,096
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From: Niles Canyon Ca.
Spray on gasket remover , or paint stripper is the same thing and you have let is work for a while with some scrapping for heavy stuff . Second option is a brass wire wheel on the cordless drill jus plug the oil return holes .
Seasoned HDF Member
Joined: Mar 2010
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From: Honah Lee
Narrow scraper, screw driver or whatever is handy. Just the build up, not the aluminum. Little bit of thinner on a shop towel. It's just coming back. Need not be perfect for a street bike. It's actually cooked oil since unleaded gas will only deposit a small amount and flakes off unlike years ago with leaded gas. Just my opinion. Little late for this but went thru a Z28 al head motor while back. Was leaking water in two cylinders. They were clean. All the others had 3/32 of cake on them. Not sure what it would take but revving to 3-4K and a steady fine mist in the carb use to be a fix in the 60's. I probably would not bother trying that and I sure would not do it unless I was tearing it down anyway.
Club Member
Joined: Mar 2009
Posts: 66,096
Likes: 51,358
From: Niles Canyon Ca.
Think about the violence that goes on in that combustion chamber, a cheap wire wheel isn't going to hurt believe me just blow it out real well and any micro particles are going right the exhaust in the first 1/2 second it runs .
Club Member
Joined: Mar 2009
Posts: 66,096
Likes: 51,358
From: Niles Canyon Ca.
You can clean them up and polish the dome area but i wouldn't do much but clean up the rough castings in the ports . A good port job they actually add material and reshape the intakes , just smooth out the exhaust side and don't go crazy around the guide boss .
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