Venture 500 oil problem

[SRXSRULE2]

It has been a while since I have been over here and it has been a while since I have worked on a 500 L/C twin! Neighbours 97 venture with 500 twin keeps eating oil and now won't start. Looked at it this fall and when I took the fuel lines of the carbs the fuel was very rich with oil. Wasn't sure why but I cleaned up the carbs, put it all back together and it fired up no problem. He ran it for a day or two (ice fishing) and then it wouldn't start again. Again pulled fuel lines, full of oil again. I have the Yamaha manual, It says to adjust throttle freeplay then oil pump cable. Throttle adjusted, check the pump. Says hold WOT and mark should line up on pump and it does.

My question is where should it be at closed throttle. I'm thinking the cable is stretched but I don't have another 500 around to compare it with. Anyone have any ideas? Needs the sled for wednesday!

 

[SRX500kid]

when the oil pumps fail they fail wide open to prevent burn down. the 500 twins are gas and oil hogs as it is (trust me i have a 2000 sxr 500) so probably need a new oil pump.

 

[horkn]

:I know the first year or 2 600s were known to have a bad design oil pump, as I had to replace mine, and it has an updated Yamaha part. Iirc, the early proaction 500s had an updated oil pump to, telling me they might have been problematic. My venture ate plugs and oil for a while before we put a new pump in. Blue smoke was all over like it was the 70s again.

 

[SRXSRULE2]

I remember them being oil hogs as well, I had a 94 vmax 600. But the adjustments were different. But I think you are both right, the amount of oil it is pumping through the engine and the fuel pump it is like it is suck wide open. I'll see if I can get a pump. Thanks!