Premix vs Oil Pump?

[2strokenewbie]

Would any of you recommend switching from the oil pump to premix? I have a 1996 GTX and 97 GTI. Is there a way to test if the pump is functioning properly?

 

[pwgsx]

Keep the pump, change out the small lines from the pump to the intake. Use tygon 3/32 line. Add some premix and run the ski holding the pump arm wide open. You will see the oil move through the lines.

 

[howie099]

You can take the pump off to test it on a drill also, but replacing the lines and watching the oil move in the lines works also. Just make sure the line stay filled in the lines or you need to clean/replace the check valves.

 

[SabrToothSqrl]

Premix is the new cheap oil thread.

 

[AdamXP800]

meow lol



96 XP800!
Keep the 2 strokes alive!

 

[Mekanix]

I've only ever seen one partial failure. It was the small oil seal in the pump shaft started to leak a bit. Noticed this by seeing bubbles in the lines comming from the pump on occation.
Besides that, like they said, change the lines. Try to avoid 1/8 primer line. It has to be 3/32 orit just doesn't quite fit right.

Alright meow!

 

[2strokenewbie]

Thanks for the advice. Will need to change the old gray lines.

 

[Jasonv]

Ok I know my knowledge is limited here but this is my experience in the last two days. I bought a 96 Xp last weekend and it had been converted to premix with the old oil pump still installed. Pump had locked up and plastic shaft sheared off. Got a new shaft and a pump off another 787 I'm going to rebuild this winter.
Did the drill test oil flowed out of both lines. Also did the pump test and watched for bubbles while holding it under water (4 psi) also passed this test. I bought five foot of line from dealer and tech told me about his test. He cuts the line in half (2 1/2 foot long each) and plugs both lines into pump And then does the drill test to make sure it's pumping the same amount through each port. When I did this test one line filled up twice as fast as the other one. BAD PUMP so now I know why the engine I got the pump off failed. I have ordered a new pump. I think is as close as I can get to measuring the amount of oil being pumped like the service manuals describes

 

[AdamXP800]

Not sure I've ever heard of that test before. How would that work, there should be air sealed in that line?



96 XP800!
Keep the 2 strokes alive!

 

[Jasonv]

In all my research I haven't heard of it either and I'm getting better at searching the site
1. So I hooked the supply line to the pump and bled the air out of it.
2. Hook up the new oil line to the pump and held the end of them up in the air
3. Took the old oil pump shaft and put it in my drill.
4. Held pump in the open position and pulled trigger on the drill
5. Pumped until the oil reached the top of the one line and the other line was only half filled
6. In the service manual it tells you to measure to make sure there is equal delivery to both ports

 

[RodInEscondido]

For you visual learners out there, of which I am one ... a couple pictures to add to Jason's explanation; you can activate the flow control while testing