What is the proper Oil Ratio

[Rprecision]

10 M8 stock running 26/1, the thing is choking on oil. The pump isnt sticking so on to adjustment. I took 2 turns out on the rod for the next ride, but I dont have a target ratio.

I have asked dealers, called CAT, checked repair manuals, owner manual, NOBODY can tell me what Ratio I should be aiming for.

If I listen to the forums I could be at 32/1, 40/1, 42/1, 50/1, 60/1.

I am just a little irritated by the lack of a concise spec

Anyone ?

 

[sledtahoe]

35 to 1

Alot go at 40 to1, but if you get around 35 to 1 I would be happy if it runs good run it.I run around 32to1 and have over 5000 miles.Stick to a good syn..better to keep it fat..JMO..

 

[AaronBND]

I run Redline 36:1 premixed.

Aaron

 

[Kid Rock]

oil delete kit, takes off 8 pounds. i run 40 to 1 with blue marble and the plugs look great.

 

[clutch man]

10 M8 stock running 26/1, the thing is choking on oil. The pump isnt sticking so on to adjustment. I took 2 turns out on the rod for the next ride, but I dont have a target ratio.

I have asked dealers, called CAT, checked repair manuals, owner manual, NOBODY can tell me what Ratio I should be aiming for.

If I listen to the forums I could be at 32/1, 40/1, 42/1, 50/1, 60/1.

I am just a little irritated by the lack of a concise spec

Anyone ?

Cat APV oil is 50/1, red line and amsoil intersepter to our 50/1. DO NOT RUN A MINERAL OIL LIKE BLUE MARBLE PURE JUNK. they leave a slime on the power valves that ia hard to get off ( had a 03 900 cat took over an hour to just get the valve out with that junk in it)
50/1 is what to shoot for or 13.5 oz per 5 gal gas

 

[AaronBND]

Cat APV oil is 50/1, red line and amsoil intersepter to our 50/1. DO NOT RUN A MINERAL OIL LIKE BLUE MARBLE PURE JUNK. they leave a slime on the power valves that ia hard to get off ( had a 03 900 cat took over an hour to just get the valve out with that junk in it)
50/1 is what to shoot for or 13.5 oz per 5 gal gas

Sorry............No way in hell I would run that ratio!

 

[Coldfinger]

I've calculated my 2010 M8 at 28:1 over 5 tanks of fuel at 10,000'. It wasn't always 28:1 for each tank because it was easy to be off a little here and there as far as filling the fuel and oil to the exact levels each tankful, but I'm confident I'm real close after 5 tanks.

I think it may depend what altitude you run at, similar to jetting on the old sleds. The higher you ride the richer it becomes because the pump only knows the throttle is at X position and is putting out the same amount of oil even though the engine is getting less fuel, thus your mixture becomes richer.

If you always ride high altitude, then maybe you would be ok backing off the pump till you get somewhere in the 30's:1 ratio.

Say if you adjusted things so you were 35-40:1 at 10,000'. That would seem pretty reasonable to me, but then if you ride much lower it will lean out even more becuase more fuel will be used at any given throttle setting while at the same time the oil pump is feeding the same amount. Could you get too lean at low altitude, maybe?

One of my main concerns was that backing off the pump too much may cause the engine to NOT get enough oil at idle or low throttle settings. I don't know at what point the pump on these starts producing but on the old sleds I thought they called it "engagement" when the two lines on the pump arm and the housing lined up, and when the throttle slides start to move you want the pump arm to move as well. If you back off the setting too much, does that change the pump engagement point? Hope this makes sense.

 

[Arctic Thunder]

Sorry............No way in hell I would run that ratio!

X2

I think in the reading that I have done. The peak performance is around 37-40:1.

Some oil guys say you can run their oil at 75:1 or higher. But IMO the more oil you can handle without fouling will be better on the motor and bearings.

You will have to make some jetting changes if you make a big move.

My M1000 is running 36-40:1. (Depends on riding for the day, family verse hard riding)

Thunder

 

[73GOLIATH]

40 to 1
i wont ever run a full syn oil agian it does not burn all the way leaving a hard carbon in the power valves and the y pipe

 

[backcountryislife]

I run 32:1, I know people who run 28:1 (premix), the highest I'd go is 40:1.

50:1 premix is sketchy, 50:1 with an oiler is asking for serious issues in the mountains in my opinion.

 

[Qreiff]

I'm at 32:1 myself also. Probably could go a turn more but, the sled runs great 2700 miles.

I realize this is a plug but.......please check out my website, watch the informational video on Legend Oil. It is the best stuff on the market in my opinion. They are taking advantage of modern era additive technology for lubricity and clean burn. It is a hybrid oil years ahead of competing oils.

PM me with questions.

Thanks,

Quinton

 

[Carbon77]

Pardon my ignorance but how exactly do you tell your "ratio"??? (gotta learn somewhere right?)

 

[AaronBND]

On level ground, mark your oil tank where it's current level is with a pencil. Ride for a few hours and see how many ounces of oil and gas it takes to put it back to where it was before you rode. Divide the ounces of gas by the ounces of oil. Say you burnt 3 gallons of gas and 12 oz. of oil. 3 gallons x 128oz. = 384oz. of gas divided by 12oz. of oil = 32:1 ratio.

Aaron

 

[diggerdown]

3 gallons of fuel will not give you an accurate ratio. The ratio varys with two different people riding the same sled, or same person two different days. Pumping the throttle, idle time, how long you hold it full throttle, how much powder and air temp all effects it. You are looking for an average, 40/1 is plenty safe and should be checked with several tanks of fuel.

 

[Arctic Thunder]

3 gallons of fuel will not give you an accurate ratio. The ratio varys with two different people riding the same sled, or same person two different days. Pumping the throttle, idle time, how long you hold it full throttle, how much powder and air temp all effects it. You are looking for an average, 40/1 is plenty safe and should be checked with several tanks of fuel.

Digger, your right but Aaronbd has the right concept.

Personally I like to take a couple full day rides and check it each day to get an average.

But again Aaron has the concept right, to explain how to do it.

Thunder

 

[skimike]

mine runs at 29:1 stock It seems thats what ac set all 2010 m8 28 or 29:1 Im not about to change mine. ac set it there for a reason . setting your pump at 40:1 isnt the same as premix at 40:1, unless you are going with a oil delete I wouldnt mess with it. mine loads up at Idle too but soon as you open it up it clears out and it will run fine. if you start messin with your pump and unless your a ac expert , you may just end up burning down a good sled. just my opnion. I want my sled to run for a long time. I put 1600 miles on mine this season with no problems. and trust me I rode the hell out of it

 

[clutch man]

40 to 1
i wont ever run a full syn oil agian it does not burn all the way leaving a hard carbon in the power valves and the y pipe

40/1 is why it leaves oil on the power valves, it needs to be 50/1.
I run a repair shop and in the middle of the season i do 2 or 3 motors a week. Every motor i send out rebuilt is set up at 50/1 with amsoil intersepter. I have never had to redo any of my work they our all out there running and good. when oil in a 2 stroke burns it builds carbon, if there is not to much carbon it will burn and go out the pipe. WITH TO MUCH OIL IT WILL LEAVE CARBON ON THE PISTON. that is why you have oil on the power valves, it is not the oils falt it is yours for running it to rich. In my years of snowmobile repair in the last few i have seen alot more that the carbon burt the motor down. Polaris and cat both have there oilers to high I have ajusted many.

PS just FYI i have 6 mod 800 polaris rmks out there running 50/1 and none have any problems at all rebuilt a 2000 one at 5130 miles did not have to repalce any bearings on the crank just new pistons seals and gaskets. This motor has twin pipes, high comp heads, reeds, ported and bored carbs, runs 8300 rpm and has always ran 50/1 amsoil. that sled came back to me later with over 7200 miles with a bad clutch, one new clutch and back on the snow and still had 152 lb comp in the cyls and runs very strong.

 

[duc848]

Oil pump delete and 40:1. The only way to go.

 

[sledtahoe]

better syn

40 to 1
i wont ever run a full syn oil agian it does not burn all the way leaving a hard carbon in the power valves and the y pipe

sounds like you need a better synthetic, like i stated above run redline oil and have never had to even clean the power valves.Runs like the first day i got it...now over 5000 miles...also compression has not changed either..

 

[skimike]

40/1 is why it leaves oil on the power valves, it needs to be 50/1.
I run a repair shop and in the middle of the season i do 2 or 3 motors a week. Every motor i send out rebuilt is set up at 50/1 with amsoil intersepter. I have never had to redo any of my work they our all out there running and good. when oil in a 2 stroke burns it builds carbon, if there is not to much carbon it will burn and go out the pipe. WITH TO MUCH OIL IT WILL LEAVE CARBON ON THE PISTON. that is why you have oil on the power valves, it is not the oils falt it is yours for running it to rich. In my years of snowmobile repair in the last few i have seen alot more that the carbon burt the motor down. Polaris and cat both have there oilers to high I have ajusted many.

PS just FYI i have 6 mod 800 polaris rmks out there running 50/1 and none have any problems at all rebuilt a 2000 one at 5130 miles did not have to repalce any bearings on the crank just new pistons seals and gaskets. This motor has twin pipes, high comp heads, reeds, ported and bored carbs, runs 8300 rpm and has always ran 50/1 amsoil. that sled came back to me later with over 7200 miles with a bad clutch, one new clutch and back on the snow and still had 152 lb comp in the cyls and runs very strong.

I dont get it if all it needs is to have the pump set at 50-1 why does the factory set it at 29-1