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Bad Oil Pump 787?
- Thread starter jrv435
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atriot:CReynoldsMIZ
Well-Known Member
I guarantee you aren't reading that on this site. Almost everyone "the regulars" at least say if you maintain the oil system it won't fail. Change the oil filter and the small oil lines and call it good
Rosie2514
Active Member
I agree with him ^. The old school standup guys on PWC today swear by pre mix and that may just be for their application . I like my pump .. Why you ask ?
1) properly maintained it is very reliable .
2) the pump varies output with throttle . At idle your mixture will be somewhere in the 100:1 area while at full throttle you are running 40:1 (max output) . This "varying " of the pump won't foul your plugs if running at low rpm for a sustained amount of time, and will burn A LOT less oil overall
3) it's easy! Fill the oil tank and gas tank and go ! And if you run low on fuel you won't be scavenging to find someone with pre mix .
Just my opinion
1) properly maintained it is very reliable .
2) the pump varies output with throttle . At idle your mixture will be somewhere in the 100:1 area while at full throttle you are running 40:1 (max output) . This "varying " of the pump won't foul your plugs if running at low rpm for a sustained amount of time, and will burn A LOT less oil overall
3) it's easy! Fill the oil tank and gas tank and go ! And if you run low on fuel you won't be scavenging to find someone with pre mix .
Just my opinion
SabrToothSqrl
Well-Known Member
Leave it alone.
Spimothy Leary
Well-Known Member
agree leave it alone, assuming you see some smoke when ideling, and it hasn't seized... its working.
now if you owned a yamaha, i'd say go premix now... but seadoo's are not known to fail.
I'm in Ft myers as well, if you need anything PM me. I have spare oil pumps, etc.
now if you owned a yamaha, i'd say go premix now... but seadoo's are not known to fail.
I'm in Ft myers as well, if you need anything PM me. I have spare oil pumps, etc.
Make sure your lines are new with a new filter, both the inlet line and the two 3/32 outlet lines. Check that the two Phillips mounting screws are tight. Also, there have been some reports of the pressed in inlet nipple coming out of the pump on units that have been badly overheated. A wrap of safety wire around it and pump will safeguard against that if there is any question.
Spimothy Leary
Well-Known Member
cracked lines.. no smoke...
past that you know when your not getting oil... you'll seize up... its easy ! lol
bell99man
Active Member
I am not an expert but aside from no smoke and or lack of that smell 2-stroke exhaust has, probably the only symptom will be piston seize or low compression and at this point it's too late. It will crank and run without oil so until it wears something out or overheats you may have a hard time noticing on performance.
Check it often. Look for oil leaks in the area and keep the hoses & filter fresh as already mentioned.
Check it often. Look for oil leaks in the area and keep the hoses & filter fresh as already mentioned.
Spimothy Leary
Well-Known Member
sadly, its the truth... I premix ALL my ski's good pump or not, even though in an earlier post I said leave it on, for me its a personal preference. I even premix with an engine under warranty... now maybe this is because its stuck in my head since I rode Yamaha ski's before moving into seadoo, and again yami's are much more prone to pump failure than seadoo is. but as a personal preference, i'd rather burn more oil, have a little inconvenience when fueling, than EVER have to replace an engine. it sucks !!! if your engine seizes because of a bad pump, i don't have any additional work, if my engine seizes.. I'm in for a long weekend.
CReynoldsMIZ
Well-Known Member
I really like the oil injection because it is impossible to screw up. For instance if you loan the ski out to one of your family members or buddies. Do you really expect, or should I say, want to rely on them not to screw up the premixing of the oil and gas and then your up shits creek when it is toast? Oil injection, just fill it up with oil and gas and ride it, and save $$$$ on oil at the same time. Win win.
Dr Honda
Well-Known Member
As above... on a seadoo... because of the reliability of the pump, and the center gears (on most of their engines) that need oil... there isn't any reason to remove it.
In all my years with playing with seadoo's... I've never actually seen a pump fail.
1) I've see the fitting on the feed side break off.
2) I've seen people mix oil, and plug the filter.
3) I've seen the hoses break, and fall off.
Basically... any time someone with a seadoo, that says... "My oil injection failed, and killed my engine"... what they really meant to say is.........
"I'm an idiot, and the 16 year old oil system, that I've never maintained, has finally bit me in the a$$." (lol)
So... use the right oil... and inspect the system every once in a while... and change the filter, and hoses once, every few years. If you do that... you will never loose an engine because of "an oil pump."
In all my years with playing with seadoo's... I've never actually seen a pump fail.
1) I've see the fitting on the feed side break off.
2) I've seen people mix oil, and plug the filter.
3) I've seen the hoses break, and fall off.
Basically... any time someone with a seadoo, that says... "My oil injection failed, and killed my engine"... what they really meant to say is.........
"I'm an idiot, and the 16 year old oil system, that I've never maintained, has finally bit me in the a$$." (lol)
So... use the right oil... and inspect the system every once in a while... and change the filter, and hoses once, every few years. If you do that... you will never loose an engine because of "an oil pump."
jrv435
New Member
Like I said previously, I'm big on preventive maintenance, which is why I asked. Eliminating the pump did not make any sense to me, but as we now know there are those who believe the story of someone blames the equipment for failing when it fact they never took the time to put an once of grease or lube on the machine. So, I'm with you guys and thank you for your great advise.:cheers:
with pre-mix, you can kill the engine just as quickly by forgetting the oil. This discussion of pre-mix versus injection really isn't geared towards those on this forum who actually maintain their skis, its for those that eventually visit this forum because the engine stopped suddenly one day and even the new battery still won't budge it.
Dr Honda
Well-Known Member
Just an FYI... the only "Seadoo" oil system that I MAY recommend removing, is on the early Mercury engines. (2000 to 2002) There is a plastic gear, that is known to fail. But... it takes +10 years for that to happen.
So... in that case... I recommend removing the system, and running pre-mix... UNTIL you do a rebuild. Then... install the new style gear (stronger) and put the pump back on. (trying to pre-mix a 50 gallon fuel tank is a Bi*ch)
On the newer style engine... there is an electric injection pump... and I've yet to hear about a failure. That was on the 2003-2005 Merc seadoo boats.
So... in that case... I recommend removing the system, and running pre-mix... UNTIL you do a rebuild. Then... install the new style gear (stronger) and put the pump back on. (trying to pre-mix a 50 gallon fuel tank is a Bi*ch)
On the newer style engine... there is an electric injection pump... and I've yet to hear about a failure. That was on the 2003-2005 Merc seadoo boats.
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