excessive oil consuption

[kiwi]

havnt pulled pump off yet,doing a bit of reading to see how pump actually works,i can see if a piston is stuck it will block oil but cant see how it would give me more,can someone enlighten me as to what i should be looking for when i pull pump apart and if anything else in pump could cause it
thanks dennis

[Suzukidave]

The Suzuki designed oiling system thought fairly complex in design is fairly simple in action . As you already know oil goes from the tank , through the pump that controls both pressure and volume and then to the engine . I cannot think of anything else but the pump that could be over feeding oil to the engine while the engine is running. Remove and block the oil feed line , remove the carb linkage and 3 screws .. the pump is in your hands . Just grab the pin that goes through the pump drive shaft as you pull the pump off and check for any loose O rings .

[kiwi]

got the pump off and pulled it apart,cant see anything that sticks out as faulty all pistons free and working okay,if the o ring seal at bottom of pump is leaking could this cause it and where would the oil go
dennis

[jabcb]

Suzuki used a number of pump designs. Also, noticed you listed a few different bikes under "bikes owned".
Which bike are you asking about?

[oldjapanesebikes]

got the pump off and pulled it apart,cant see anything that sticks out as faulty all pistons free and working okay,if the o ring seal at bottom of pump is leaking could this cause it and where would the oil go

Let's take a step back for a moment. As jabcb has offered - what bike are we talking about ? Also - what exactly are the symptoms ? Oil drains in when the bike sits for several days ? Always heavy smoking regardless of pump arm setting ? Leaking oil in area of the pump ? You had the top off of the pump to take a look during a rebuild, but now is smoking a lot ? Etc.

[Suzukidave]

Check out the first post guys

[oldjapanesebikes]

Check out the first post guys

Oh........right

So - how many miles on this old girl ? As the pump wears it actually pumps more eh ? If all is set up correctly, and the arm is not out by 180 degrees, and it isn't leaking out elsewhere, then actual pump wear is a possible cause.

[Suzukidave]

I wonder if it couldnt have something to do with the early J pump as those also came with the pumps that would pull oil from the tank , these were later replaced with the gravity feed pumps . I have read of oil tanks being crushed when the oil tank cap vent was blocked .

[kiwi]

ive got a later model oil pump off e bay,its a later model,76 by the look of it,only the 2 piston pump,pulled it apart to check out,looks okay so now i need some gaskets,gtreiner i believe may have have them,is there anyone else that does them,when this pumps on hopefully all ok,ill let you know
thanks dennis
gt750j

[Suzukidave]

This is so strange what could be causing the system to use so much oil ?

[kiwi]

bikes only showing 11000miles but who knows if thats correct although looking at bike it could be,pump dosnt really show much sign of wear but im no expert,gaskets are on the way so soon as get new pump on should be okay hopefully
thanks dennis

[tz375]

Dennis, you mentioned that the new (to you) pump is a later model. Presumably that means it's a 312 pump to take the link rod rather than a 310 to take a cable. The actuating arm can be swapped over from one to another. Just make sure that the "cam" is the right way up.