TIME FOR A 3 WAY!!! Summer BOTM nomination Time "A Trifecta of Awesome"
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Nice job on the carby - can I ask what you cleaned it with. On my (standing 14 years) A100 it appeared full of oil and was pretty crusty too with unidentifiable residues. Didn't get it as spick and span as yours though..CheersJ
Man, I am super jealous your oil lines are in such good shape! My '70 TC90 had a seized pump, and the lines were solid gunk from banjo to banjo, but yours look brand new. It took me two days to clean them out. Nice job on cleaning it all up, should turn out really nice. I wish my local Humane or Goodwill got stuff like that dropped off, I'd go with my wife more often
If I remember the oiling diagrams correctly, the typical Suzuki CCI system does not recirculate, but burns off the oil in combustion, even that which is sent directly to the crank bearings. You are correct that removal of the pump is a sure way to wear out your bearings. As it so happened with my TC, the pump was run dry which allowed it to seize, but the bearings must have been pretty robust because they are still in good working order.
To test it (and there are others who may have a better method) remove the throttle cable, the oil feed from the tank to the pump and the two lines to the bearings from the pump, remove the pump from its chamber (should be two screws holding it in place), reconnect the feed from the tank to the pump. You may have to replace the oil feed line with a longer one to give yourself some more room to work. Using either a small zip tie, or some mechanic's wire, secure the throttle actuator (I'm sure there's a better name for this) in a fully open position. On the back of the pump there is a small flat stud which is the driveshaft for the pump mechanism. A small battery powered drill with a hand chuck (not the keyed type, its too easy to put too much torque on it) can grab that flat stud, then spin the drill. You may have to observe the rotation of the output drive on the engine (where the pump was mounted) to determine which direction to spin the pump driveshaft, either forward or reverse. There will be a specification in the owner's manual for how much oil should pump over a period of time, however I've never bothered to precisely measure it on any of my two strokes. In my very non-scientific experience, there won't be a tremendous amount of oil that will come out of a properly working pump, it is typically measured in the mL if not a smaller unit. As such, if you have what you judge to be a steady flow, the pump is probably OK. If the flow is intermittent or just barely eeking out, then you should replace the pump. Again, this has been my shadetree experience, and I'm sure the purists will claim that I am shortening the life of my bikes/giving terrible advice/etc all doomsaying. However most of mine have been toys, neighborhood knock around bikes and don't see a lot of miles, but they have never let me down. Choose your own path.
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