So how does he know it wasn't the 4 tanks of Seafoam?????
Startron is another pretty good product I've seen mentioned on here.
The leaking needle and seat can also be a couple of other things besides varnish. The seat has a tiny o-ring around the base, that you won't see until it is removed from its little pocket. If that o-ring is shot/damaged for whatever reason, it'll let gas past around the outside of the seat. Keeb had an issue where his was leaking, and when he pulled the seat, it was crudded up so bad on the bottom side, that it had gone beyond simple varnish, and required him to replace the whole needle and seat instead of just cleaning it. When Keeb had originally pulled the needle, and looked into the seat, the seat was clean as a whistle on the inside. Little pieces of the crud must have been breaking loose and causing the seat to leak(just a guess).
The real Seafoam clean job for a carb
, involves sucking the Seafoam into the fuel line while the engine is running, until you see smoke start to come out of the exhaust. By that time, the Seafoam has filled the bowl, and the passages in the pilot
circuit, etc.. You then shut the engine off, and let it sit a minimum of 8 hours. After it has sat, you start the engine, get it running, and take a ride(drive)to burn the Seafoam out. It'll smoke
I've wondered about rigging up some sort of gravity feed with the Seafoam, sort of like an IV, so the gravity would let the Seafoam run into the carb inlet on the bike. My lawn mower has the fuel pump situated so that I can just stick the fuel line in the bottle, and it'll suck it into the carb. I thought it might work to run it into the Bowl vent on the 40CV, after draining the bowl also, but I don't know if there is a one way valve in the bowl vent that would prevent it.
That could be accomplished with a short piece of hose and a small funnel....."if".
Anyway, saturday morning pondering, in the middle of the internet highway.