Waverunner not mixing oil with gas

[BiscuitsJaM]

I have a 2002 Yamaha SUV1200 with about 55 hours. As you know, it has two tanks - one for fuel and the other for oil, and it mixes them itself as it goes into the engine.

The thing has always used less oil than I thought it would, but recently it has been using almost none. I have not noticed any problems with how it runs, but I am concerned that continued use will damage it. I'm using the recommended name-brand Yamalube, which was purchased in 2003.

What should I do?

 

[JUSTINTIME]

Re: Waverunner not mixing oil with gas

do an oil output test
blow compressed air back through the lines

 

[Rob454]

Re: Waverunner not mixing oil with gas

get rid of the BS oil injection and premox. This way youll KNOW that your motor is getting oil.
I remove the oil injection from ALL my skis
Rob

 

[BiscuitsJaM]

Re: Waverunner not mixing oil with gas

1. Is it possible that I've already damaged my engine and don't know it?

2. Is it possible to fix the Yamaha oil injection system so it works properly? I've heard a lot of bad things about it...

3. How do I do an "oil output test"?

4. How do I remove the oil injection system from the waverunner entirely?

5. If I premix, what mixture should I use?

6. Does premixing change anything maintenance-wise or otherwise that I should know about?

 

[Rob454]

Re: Waverunner not mixing oil with gas

1. Is it possible that I've already damaged my engine and don't know it?

2. Is it possible to fix the Yamaha oil injection system so it works properly? I've heard a lot of bad things about it...

3. How do I do an "oil output test"?

4. How do I remove the oil injection system from the waverunner entirely?

5. If I premix, what mixture should I use?

6. Does premixing change anything maintenance-wise or otherwise that I should know about?

Do a compression check. compression shoud be around 125 or so.

If the oil pump is bad then the only way to fix it is to replace it. i think yours has a variable rate pump. There shoudl be a cable that goes from the throttle wheel at the carb to the oil injection pump. Check and make sure that the cable isnt binding. If it came off the pump is supposed to go the Wide open setting

I never heard of a oil output test. If you pull the plug wires and take off the oil lines going to the carb as you crank over the ski little drops of oil shoudl come out of the lines.

You need to drain the oil tank. then pull the oil injection pump. get a block off kit ( about 12-16$) its basically a piece of metal that covers up the left over hole where the oil pump shaft went through the front case. little silicone on the backside to make a watertight seal so no water gets in the stator area. Then get some small rubber caps and cap off the old oil inejction fittings at the carbs. Some older skis had them in the air hat area others had them in the manifold

I usually mixed at 40:1 for regular and 50:1 for synthetic but I used regular oil for the most part.

the only thing it changes is youll need to mix the fuel and oil in a gas can before you pour it in the tank. I usually let the tank run low then added the required mix in the tank then I poured in the gas and then I went to my destination ( when I went on long trips liek the river) when i went to local ocean riding spots i mixed in a gas can and poured it in.
As far as maintenance is concerned the only thing its gonna do is basically nothing but what I listed above. Well its gonna do one thing. Youll know that as long as youre getting fuel youre getting oil. Your tune ups and maintenance wont be affected by the pre mix.


Jeff may have soemthign to add to this.

Rob

 

[Jeff Walkowiak]

Re: Waverunner not mixing oil with gas

the big problem with yamaha is they use crappy oil lines and cable ties to secure the oil lines,, carl at island racing has a kit to replace the lines and clamps,, as for using oil you can advance the pump by adjusting the cable to the oil pump, there is actually a timing mark on the pump and on the cable cam I usually adjust the mark just past center so it makes the oil a little richer but if the oil was not being metered or the pump was bad you would have already blown the engine.. another trick just to be safe is to add a little oil to the fuel and use the pump also, just 8 oz for a full tank of gas, also keep in mind that the pump meters oil very sparingly at low speed and the use of the oil will be slight if you are not running it hard, 2 stroke engines at low rpm need very little oil it is at the higher rpm range where it is important to have sufficient oil.
back to the oil pump, the marks are supposed to be even at idle, if you bring the cam on the pump to just past the mark at idle you will have more than enough oil being added to the engine.

 

[Rob454]

Re: Waverunner not mixing oil with gas

Personally I woudl get rid of it. i dont trust the damn things
Rob

 

[JUSTINTIME]

Re: Waverunner not mixing oil with gas

if u pre-mix u need to re jet the carbs by 2 jet sizes also

 

[BiscuitsJaM]

Re: Waverunner not mixing oil with gas

if u pre-mix u need to re jet the carbs by 2 jet sizes also

I'm really not sure what this means. Explain, please?

 

[Rob454]

Re: Waverunner not mixing oil with gas

hes saying that you need to pull the carbs off and change the size of the jets low and high. so if you have a 107 and a 75 you ned to go to a 77 and a 109 or whichever is closest.
personally I dont think you do. you can turn the high and low screws out about 1/8 of a turn if you want to but You shouldnt have to do that even. I never did that on my wifes ski and it ran fine and it was completely stock. My raider I rejeted but I swapped to 44s so I had to. For a stock ski I dont feel you need to. besides turning the high and low adjustment screws out will do the same as rejetting. 2 jet sizes isnt that much that the High low screws cant compensate. But you dont need to IMO
Rob

 

[JUSTINTIME]

Re: Waverunner not mixing oil with gas

u need too!
think about, on a yami or any other ski the oil is injected into the intake, so no oil ever makes it into the carb
when u pre-mix u have a thick substance in the carb

trust me on this one, i have seen many guys blow motors because too lean

 

[Rob454]

Re: Waverunner not mixing oil with gas

Dude hes not mixing 1:1 ratio. youre making it sound like hes gonna try to push molasses through the carbs. The only way hes gonna run lean is if he mixes some crazy mix but if he sticks to a 40:1 mix he will be fine.
he can just turn his high and lows out to compensate if he needs to. Yamahas are jetted heavy from the factory anyway. Ive never seen a motor run lean from going to a premix. I switched my Raider from injection to premix and i never had to rejet. The ski had 120 hours on it when I really started to build it up and it had 180 hours on it when i sold it and the compression was the same as when it was new. I woudlnt steer anyone to do something that will harm their skis. I NEVER heard of having to rejet when switching to premix. The only time I ever rejetted skis was when customers wanted to do some performance mods 9 air spark arresters porting boring out etc. If he doesnt have a variable rate pump then hes running a ton of oil anyway. Way more than he really needs.
Either way thats my opinion.
Rob