Oil Injection Pump Cable

[Wcmarshall]

I was rebuilding the carbs on my 1996 GSX this weekend and when I was reinstalling them I was having a problem with the oil injection pump cable that runs from the back carb to what I think is the oil pump on the front of the engine. The cable was binding which was caused from it being frayed badly on oil pump end. It would engage the oil pump but when I released the throttle cable the oil pump would not return to its at rest position since the cable would bind in the cable housing. I had the engine rebuilt several years ago by an authorized dealer in Kingsland, TX and I am guessing that the cable has been like that since the rebuild. I was wondering how much damage may have occurred to the engine over the last two years due to the oil pump being stuck in the open position like it was. This jet ski has always been problematic, hard to start, and a little down on power compared to an almost identical 1996 GTX with the same engine and its never had a single problem other than needing a new wear ring on the prop. I think the main problem I found was the little card filters inside the fuel pump were very gummed up. I cleaned them and hope this gets rid of the top end surging issue I had over 4000--5000 rpm.

I am very curious just how the oil pump actually works when the throttle cable is engaged. Does is squirt oil only when it rotates or does it continue squirting if it is left open? Which I assume would then lead to too much oil in the carbs and fouling the spark plugs.

 

[ski-d00]

oil pump function is very simple, it is driven off the crankshaft and is pumping(not really squirting) all the time when the engine is running. the flow rate goes up as the lever is pulled, so if yours was stuck open, it would give too much oil at low rpms and would smoke more than it should, gum up rave valves faster, and foul plugs more frequently but no real damage would be caused.

 

[Wcmarshall]

That makes sense. When I ran it a couple weeks ago it was smoking like hell for at least 5 minutes after start up. It seemed to smoke less after it had been running a while both my GSX has always smoked some. Now I know why. Thanks

oil pump function is very simple, it is driven off the crankshaft and is pumping(not really squirting) all the time when the engine is running. the flow rate goes up as the lever is pulled, so if yours was stuck open, it would give too much oil at low rpms and would smoke more than it should, gum up rave valves faster, and foul plugs more frequently but no real damage would be caused.