If you want to give your crankcase an enema, looks like substituting a quart of kerosene would do the job! Actually an old lawnmower repair manual I have says in temperatures below freezing to substitute so much kerosene in place of the oil. But I think this book may have been written before multi-weight oils. Maybe when SAE-30 was only available.
As far as adding stuff to the fuel tank.
I tried adding Seafoam to my Trabant's fuel tank. It being a 2 stroker, last time I peeped through the spark plug holes, there was allot of carbon buildup on the piston crowns. So before I pulled the heads and jugs off I thought I'd try it since everyone says it works so well. Following the directions on the bottle.
Well after several tanks, I pulled one of the plugs and took a look. I couldn't tell any difference. Carbon deposits are still there!
As far as adding stuff to the fuel tank.
I tried adding Seafoam to my Trabant's fuel tank. It being a 2 stroker, last time I peeped through the spark plug holes, there was allot of carbon buildup on the piston crowns. So before I pulled the heads and jugs off I thought I'd try it since everyone says it works so well. Following the directions on the bottle.
Well after several tanks, I pulled one of the plugs and took a look. I couldn't tell any difference. Carbon deposits are still there!