Ski Doo Tundra question

I have a '95 Tundra II LT. You guys have convinced me to disconnect the oil injection system and go to mixed gas; I have a question or two.

1) What oil to gas mix ratio do you use?
2) I assume it's important to block off the oil injection line so that you don't create a vacuum and lean it out, but other than that is there anything else you do? I can't imagine that leaving the pump attached is a problem??

This machine has very few hours on it. I just went through the whole thing; replaced all the bearings, cleaned out the gas tank thoroughly, cleaned the carb etc.. The track is in pretty good shape, but I did notice a little crazing. Since OEM tracks (and many other parts) seem to be impossible to get anymore, are there any other tracks that can be retrofitted onto this machine? I think it has a 126" track.

50:1
Block the line or crimp it.
Take the pump off and throw it in the woods.
Block the oil tank line and tie wrap the pump cable out of the way.

Track is oddball 139". Odd pitch if I remember right. Take a lot of modifications to get a 136" standard track to work on it.

You can also remove the oil reservoir and cut the top open. Clean it out well and reinstall it. Keep a couple pairs of clean gloves in there. Always dry and warm

Royal Distributing out of Ontario sell new replacements track for the Tundra 2, and lots of other obsolete parts.

Hopefully they have cdi's,,I'll call in the morning.
Thanks!

I’d like to hear some convincing reasoning on removing the oil injection.. I’m totally for upgrading and modding...but I had an uncle who was master mechanic level. One day he saw I had flipped over my air cleaner cap on my 77 Chevy short wide. And asked if I thought I was smarter than gm’s engineers, my reply was no. He then asked what the (This word is unacceptable on Trapperman) I thought I was doing. Point is there is a right way a wrong way and usually a lot of reasons why.

https://www.alaskatrappers.org/stories_thoughts_on_the_tundra_2.html

In short, the plastic gear that drives the oil pump is a known weak point, particularly in very cold temperatures.

Thats easy.....When, (not if) your oil inject quits you will burn your engine up. I never understood why they put oil injection systems on snow machines...how hard is it to mix a can of gas??

It is so people can fill up their machines at the gas station.

BTW I think I have a CDI. Denso 070000-1960

there are quite a few things like oil injection that are added to machines to aid the "simple" user. In 95% of the applications they work great with no issues and it is easier for the user to not screw something up. The environment and conditions you guys are using machines in is a different thing altogether. Newer technology doesn't mean in a rough climate it is better. Take cell phones for example. 10 years ago or more i could take my nokia whatever model number dead brick phone and make a phone call outside when it was -20 and have no issues. I sat out in plenty of disgusting weather on call outs using cell phones to communicate because the company i worked for was to cheap for radios. Now take my iPhone i own today. IT can literally file my taxes for me if i wanted it to but it cannot function on bit in below freezing temps. As soon as it gets cold it just shuts off. Is it a better phone for 95% of folks sure. Is it better in bad weather and tough climates nope.

On another note i find random "modifications" to working things crazy. My father in law for example had a fuel pump go out on his Yamaha rhino. Factory replacement was $50 or something. Not crazy but he had to order in because random small town in Montana had no parts. They did however have a $30 elec one size fits all fuel pump. He bought that instead and wired it up. With GPM flows ten times what factory recommends his carb overflows at an idle even with a new needle and seat. So what does he do he installs a power switch for his fuel pump. When idling you turn the fuel pump off so it doesn't flood out. It will idle for a few minutes before the bowl runs out of gas. Prolly has $100 in a jerry rig fix when the correct one was $50.

So finding the in between of this is key when looking at stuff like snowmachines utvs or vehicles in general. I always read up and do research on models to find out what others know. For example like this issue with the oil injection. It is a very common and practical issue where the oil injector quits working and causes engine harm. Seems like you guys have figured out this is something you just don't need and the machine is better without it.

I have no problem mixing gas and in fact prefer to. However with the mention of ease of use and filling up at the station, the oil injection seems convenient at -20.
On another note seems like you’d hear the engine lean out and could shut it down in time to do little harm..

^^^^^
"Leaning out" and lack of oil are two entirely different things, but either result in a wrecked engine.
Lean is too much air in relation to the amount of gasoline, and lack of oil is just that.

Look up lean mix and rich mix. It will explain more oil or less oil.

So a lean mix has nothing to do with oiling the bottom end sealing the rings??

I suppose as a general term but anything with mixed fuel is a different definition.

A lean mixture (too much air) like from a vacuum leak or a major drop in altitude, results in an improper fuel to air mixture. One of the symptoms that something is wrong are grayish-whitish colored spark plugs. This results in a piston meltdown from the top end.

Too little oil results in ring seizure and cylinder scoring.

I get that...but but if u put more less oil in your mix it is either lean or rich.

So without air a fuel/oil mixture can’t be rich or lean, it’s just a heavy or light mix huh?...

The number one reason my shop rebuilds Tundra singles is due to oil injection failing.
That plastic gear can’t handle the vibration and impulse of a single cyl.
On the twins the same system last twice as long, usually 10-15 thousand kms before the gear shows wear.

Okay, I'll bite again, but I think you are just playing with me.

Rich or lean refers to how much gasoline is being dumped into the carburetor; it has nothing to do with the amount of oil that is in the gas.

The mixture of gas to oil is referred to a mixture ratio. If you prefer to call a ratio of 32:1 as heavy and 50:1 as light I guess that makes sense.

Tundra300,
Thanks for the explanation for why the Tundra has a particular issue with the oil injection system; sounds resonable to me.

Well kinda joking around...but seriously this is argued all the time. Let me ask you this. What would happen, if nothing else changed ie jetting, intake, exhaust...and you added way more oil or way more gas? The answer although one of the two would happen is not foul a plug or seize the engine. Air/lots of oil/little bit o gas and air/little bit of oil/lots of gas what would you call these?
I hesitate to argue this. But let me say it one more way. Air stays the same but you mixed half gas and oil what would this do to your air/fuel ratio? Remember you just displaced a whole lotta fuel with oil.

Either way I’ll admit I’m way past the topic. I just wanted to hear more about why we should delete the injection system and I do concur. The injection system scares me.

Also want to say thanks for posting. I’m about to buy a tundra 2 and had pondered this myself. Hope this assures that I am not arguing to be a jerk.

Had a Single cyl Bravo then a single cyl. old Tundra both seize up from oilers that failed. I always noticed the Tundras when functioning normal used significantly less oil - for what that's worth. All that made me run a number of 340 Polaris machines on the oiler and a gas/oil mixture of 75/1 (in other words almost twice the oil the dealers recommend. I would change plugs once a season and things smoked more when starting up as one might expect. Every dealer I talked to said I'd burn up the engine from a leaned out mixture from too much oil. That made no sense to me. I got two 340 machines in my junk yard with a little under 30,000 and another over 30,000 and never been rebuilt but are now burnt up. Some day I want to put those speedometers on my shop wall. I run the heavy oil in every machine since including my current VK 540 Yamaha. If the oiler goes I got enough oil to take care of the engine till I notice the problem of not using any oil. I think I get more miles out of an engine and don't buy expensive oil either. Stan

I wouldn't buy one.

Dirt what would you buy? I just picked up a freestyle but it’s going to wind up being the wife’s sled.

Dirt loves his Bravo's!!!!

If the problem is a weak plastic gear on the Tundra oil pump, why hasn't someone machined a metal one for the aftermarket?

Just pull the oiler off, if it doesn't fall off on its own like mine used to. Murphy is the main reason.



Now it won't be in the way every time you have to



put one of these in


It will be easier to reach your through bolts you had to replace the original fine thread bolts that strip out the aluminum.




These should wallow out your first year



These plastic upper idlers will constantly jam up with overflow and get flat spots



and cause your track to blister if you don't constantly bust the ice out of them



The driven clutch spring will eat into the aluminum helix and break off you slider






Don't let it idle too much or the vibration cause damage.



Grease the front posts so this takes a while to occur.


That is a partial list of issues the pre 2000 or so tundra II had. I think Marty covered a fair list in his ATA article too.

I've owned multiple tundras and ran them hard in cold weather and have never had an injection system fail and my machines have a lot of miles on them. Not saying they don't give up but I think its rare. Injection systems save you a lot of money in oil as well, don't use nearly as much as when mixing.

Wow. So what are some opinions on the best trapping/work sled?

The best one is the one of which you've already got many carcasses for parts.

Lol no carcasses here yet.. but I’m not against collecting.

Amen AKNative - that is invaluable if you work on your machines. Got 2 other junkers for my present main one and about 5 for my secondary one.