Oil Pump Removal??

[FULL-THROTTLE]

How many 2-stroke owners have removed the oil pump and run mixed gas instead?
I have a 98 Challenger with twin 787's, I am replacing one motor and I noticed SBT's install tips page recommends removing the oil pumps and run mixed gas instead, Is the oil pump prone to failing on these?? or is this just a precaution?

Thanks

 

[timmyboy76]

what up....you'll get LOTS of opinions on dis topic,...installed block-off kit on mine. Smokes alittle, but....LEAST i KNOW, MOTOR WONT SEIZE, FROM PUMP FAIL'N...

 

[FULL-THROTTLE]

To pump or not to pump?

I am inclined to remove both of my oil pumps, I like the idea of controlling the oil mixture myself and of course not having to worry about a pump failing and me spending 1500 bucks on a new short block.
It will be a project after the season has ended.

Thanks

 

[kustomkarl]

The Oil injection pump from seadoo is a variable rate pump. It injects oil at a variable rate depending on the rpm of the engine. If you run premix you will use the same rate of oil all the time. I would prefer to purchase a new pump if you need to replace it, as it will save you a lot of money in the long run. You will get a lot of opinions on this subject...you be the judge.

Karl

 

[robin savell lloyd]

The Oil injection pump from seadoo is a variable rate pump. It injects oil at a variable rate depending on the rpm of the engine. If you run premix you will use the same rate of oil all the time. I would prefer to purchase a new pump if you need to replace it, as it will save you a lot of money in the long run. You will get a lot of opinions on this subject...you be the judge.

Karl

:agree: I do have to agee with karl on this one. I would still pre mix to make sure that the new oil enjection was working properly. but now I am haveing second thoughts. How will I know for a fact that it is working properly? maybe I am just paranoid. But I would say that if every thing is good with the oil injection then you would save a lot of money on oil as this oil is very expensive. :cheers:

 

[scarfie]

With premix, you'll end up with a mosquito chaser at low RPM...lotsa smoke.

I just replaced the engine block and have been running premix to break it in. I believe the oil pump is bad because it's doesn't seem to be using enough oil. I'll be checking the flow rate as per the test in the manual.

If it is bad, I'll drop $200 on a new pump. I'm a stickler for having things run the way they should...I want the variable oil flow rate.

Plus, idling out of the boat launch area and through no wake zones makes it look like a Cheech and Chong boat.

I'd say check the pump flow rate every 20 hours or so and you'll be good.

 

[FULL-THROTTLE]

Flow Rate?

When you mention the flow rate check, are you doing the check below that I pasted from the manual?


NOTE: Oil line supply must be full of oil. See
bleeding procedure above.
Start engine and run at idle while holding the
pump lever in fully open position. Oil must advance
into small oil lines.
NOTE: The engine should have a rich mixture,
idling irregularly and emitting smoke at exhaust
outlet.
If not, remove pump assembly and check the
pump gear (717 engine) or shaft (787 engine) for
defects, replace as necessary. Test pump as described
below:
NOTE: Through normal use, oil level must not
drop in small tubes. If oil drops, verify check valve
operation. Replace as necessary.

Thanks,

Fran

 

[scarfie]

I'm working with a Mercury 240 EFI so it's a different manual altogether.

This one says to run premix, disconnect the oil line that runs from the pump to the vapor seperator and let the line pump into a graduated cylinder. After so many minutes at so many RPM (don't have the manual in front of me) you should end up with X ml of oil in the graduated cylinder.