question for those who have adj the oil inj pump

[PalousePoo]

After a ride this yr on my 11 pro, I calculated the oil injection ratio to be 56:1. On that ride I was in the trhrottle alot since the snow was 2' of fluff. Back home I adj my pump by turning in the screw, clockwise, 3 full turns. Next time I checked the ratio I came up with 61:1. what the heck!!!! On that ride we did alot of slow boondocking in the trees and not much soft snow. Has anyone who has adj the screw checked their ratio? Could the pump be progressive and put out a richer mixture at 3/4 throttle than 1/4 throttle, for example? Gonna keep adding some oil to the tank, but that won't help the crank brgs.

 

[JonezyBones]

Well someone correct me if I'm wrong but I believe it is a progressive system. But it should always be proportional to the amount of fuel you use. So no matter the conditions the ratio should always be the same.

 

[JonezyBones]

Okay after reading your post a second time it's a little clearer to me now. (Sorry it's late) I'm not sure about your theory. Honestly it doesn't make any sence for the engine to not have one consistent ratio. But I'm interested so hopefully someone else can clear this up. Iv just messed with my oiler but haven't had the chance to check any ratios.

 

[Oregonsledder]

TTT

 

[B2]

My 2011 ran about 50-55:1. I left it stock, and since it was under warranty ran it that way for 1680 hard trouble free miles.
I know I have thrown my warranty out the window on my 2012 with mods, so I adjusted mine to where it was just past the "scribe" mark (this was about 2.5 turns clockwise). I've checked my ratio after 300 miles and it is 33:1. Not sure about the progressive rate, but I would think the system would try and maintain a consistant gas/oil ratio.

 

[PalousePoo]

i would think too that the ratio would remain constant. I'll check it again next ride, and measure the oil level from the reservoir neck down and try and get more accurate. Will post my findings again.

 

[beamslayer]

How are you checking your oil and fuel usage.Filling both up to the neck and than measuring with a calibrated container to fill both back up.
I would also think riding style will dictate oil usage, on and off the flipper hard like boondocking compared to a steady pull on a hill.
My assault had a hard life before me and the oil pump was set at the factory setting so just to be on the safe side I turned the pump up just above the scribe mark and hope for the best.
How's the riding upon FO ??? Where are you unloading at? I am watching sleds go by every sunday as I am out cutting and splitting wood.

 

[Thundy]

How do i go about getting to this screw to adjust my oil consumption. How Tough is it?

 

[Oregonsledder]

I for one would like to know for sure how these pumps work. Is the flow rate constant through the arm swing? I know flow volume is determined by a combination of rpm and arm position. It would be nice to know exatly how the pump meters oil???

 

[Oregonsledder]

How do i go about getting to this screw to adjust my oil consumption. How Tough is it?

You take off the hood and then you can see the pump adjuster with a black screw with a lock nut that will have yellow paint on one side. You need a 8 mm (If I remember correctly) wrench or socket (I used a socket with a flex joint adapter to get to it) You loosen the lock nut and then turn the screw clockwise for more oil. With a mirror you can see the scribe mark on the pump arm and where it lines up with the mark on the pump body. After adjusting it, retighten the lock nut. Not a hard job. There is a thread on this forum with a picture from the shop manual, do a search if you need to.

 

[trestlecreek]

The oil pump is a progressive rate. My old 1984 yamaha phazer manual indicated at an idle the ratio was 116:1!!! WOT put it around 32:1
Industry standard for pre-mixed sleds is 40:1 (for some reason arctic cat recommended 36:1). Estimating an injected sleds oil consumption is difficult, but should average around 40:1 I'm thinking.
My 2005 arctic cat M7 came from factory at something like 20:1 and fouled plugs all the time, adjusted it to where I guessed was 40:1
Depending on type of oil, I would error on the side of caution and shoot for no leaner than a 40:1 ratio.
Dyno tech has done some research over the years and if memory serves,
a little richer in the oil ratio didn't hurt the performance any.
Hope this helps some.

 

[SD Coyote]

I agree with the progressive rate. You will notice the diff when riding in deep powder, versus a more set up snow. We all know you will use more fuel as well, but the ratio of fuel to oil will drop under hard pulling full throttle conditions. The ratio would drop at any continuous full throttle operation, you just wouldn't likely be running that way on set up snow.

SD

 

[Thundy]

You take off the hood and then you can see the pump adjuster with a black screw with a lock nut that will have yellow paint on one side. You need a 8 mm (If I remember correctly) wrench or socket (I used a socket with a flex joint adapter to get to it) You loosen the lock nut and then turn the screw clockwise for more oil. With a mirror you can see the scribe mark on the pump arm and where it lines up with the mark on the pump body. After adjusting it, retighten the lock nut. Not a hard job. There is a thread on this forum with a picture from the shop manual, do a search if you need to.

Do the scribe marks have to line up for the pump to work properly?

the line on the screw in my sled points bumper to bumper

 

[Oregonsledder]

Do the scribe marks have to line up for the pump to work properly?

the line on the screw in my sled points bumper to bumper

Look for the other thread on this subject with a picture from the shop manual. It will show you what I'm talking about. It's not the black screw you need to align, but the notch on the arm with the scribe mark on the pump body.

 

[richracer1]

My 2011 ran about 50-55:1. I left it stock, and since it was under warranty ran it that way for 1680 hard trouble free miles.
I know I have thrown my warranty out the window on my 2012 with mods, so I adjusted mine to where it was just past the "scribe" mark (this was about 2.5 turns clockwise). I've checked my ratio after 300 miles and it is 33:1. Not sure about the progressive rate, but I would think the system would try and maintain a consistant gas/oil ratio.

I read on here some where that the pump stays at a constant ratio, i.e. if set to run at 40:1, it will adjust oil output accordingly based on throttle position to maintain the 40:1 ratio by using some sort of metering system, kind of like a needle and jet set up. Our adjusting is moving the "needle" out of the "jet" more for more oil throughout the entire RPM range. Now, in regards to riding conditions affecting oil use, of course it will. If you're WOT in deep pow or climbing, you're using more fuel therefore requiring more oil as opposed to cruising the trails and staying in the low to mid rpm range, but it should stay at that ratio.

 

[sleded800]

Trying to turn up the oil pumpon 11 Pro

I'm having a hard time even seeing the adjustment marks on the oil pump let alone feeling confident about changing the adjustment screw, which is the only thing I'm sure I can see. Can someone tell me what is the best way to see the pump with a mirror? Does the air box have to come out of the sled? And if so what is the best way to remove the airbox?

 

[Oregonsledder]

I'm having a hard time even seeing the adjustment marks on the oil pump let alone feeling confident about changing the adjustment screw, which is the only thing I'm sure I can see. Can someone tell me what is the best way to see the pump with a mirror? Does the air box have to come out of the sled? And if so what is the best way to remove the airbox?

The easiest way is to remove the can and come in from that side.... much easier.

 

[pura vida]

the pumps do NOT maintain a constant oil ratio. one of the early post was correct. it varies greatly from a day of trail riding to straight out of the parking lot wfo all day in 2+ feet of wet pow. i have checked mine numerous times and it varies between 40-50:1 depending how much i've been on the throttle. never checked it after an all day trail ride, don't know if i've ever had one of those... i am ok with how mine is set b/c it definitely drops into the low 40s wfo day. although i would still feel a little better if the ratio was just slightly lower, right at 40:1 on a deep day.

fyi, i check mine by filling my oil to a sharpy line i drew on the tank and divide the number of ounce of gas by oil.

pv

 

[SD Coyote]

If I remember correctly, my pump will average 40/1 for my riding style. At low throttle easy riding, it may do 50/1. On the rare times that conditions would allow really staying at near wot for a lot of the ride, it would be closer to 32/1. I think some people just check it once and call it good. I think most are happy with a 40/1 average.

SD

 

[sleded800]

I finally got my oil pump looked at, and found the scribe mark on the pump arm was considerably set below the mark on the pump body. After backing off the jam nut it took 2.5 turns to bring the pump arm up to where it is supposed to be set at from the factory, or at least the way the dealer should have it leave his shop before the sled is sold. Set the pump at one more turn clockwise to observe the pump arm to be barely above the scribe mark on the pump body. My sled only had 460 mi on it when I bought it but it still bothers me that the oil pump could be out of spec that much. Thanks to all the posters about the pump inspection issue and that the engines just could use more oil for piece of mind.