I am a little old school and still live the idea of pre-mixing, just becasue I always know the exact ratio. I have a 2000 ZRT800 and am curious what ration they are set to inject at 16:1, 32:1, 50:1... Can I simply tension to the cable to reduce the ration a little? I am assumign that the factory sets that on the safe side, but the safe side doesn't win races. I am relatively new to 2-stroke tunign (good with 4-storkes though) and I have ridden some sleds that supposedly only have pipes, reeds, and cluthc kit (which mine has), btu theirs seemed faster, I knwo there are some differences. I just got my EGT guage, but have not hooked it up yet, so can I use this to see if I am runnig to lean on oil, or do I read the plugs, or piston wash? Any insite will be helpful.

Thanks

Fast426, I'm an old school guy with a modern high tech education! First off, welcome to the world of 2 strokes. The modern oils are so good you will just create smoke and deposits in your engine by running extra oil. It is not needed at all, even with modified sleds. The ratio on an injected sled varies according to the throttle pull. This is done as the testing has shown that a sled runs better and has a longer life by injecting a 50 to 60:1 ratio at idle and a 35:1 ratio when at wide open throttle. The reason the factories have it varying is that you do not want deposits in your ring groove as this shortens the life of the motor when the rings start sticking. Bottom line with todays oils and 2 stroke engines, is the oil is not the place to try to do any tuning. You can't use the EGT to check your oil ratio either, that is just for jetting. (Fuel/Air ratio) Plugs and piston wash are read for fuel/air ratio far more than oil use. I recommend you use the factory oil injection system as it is set up, or run a pre-mix only (injection system disconnected) at about 50:1 with a premium oil like Klotz R50. R50 is only to be used in pre-mix and CAN NOT be used in the injection system. If you keep the injection system, I'd go with Amsoil Race 2000 or the Klotz Snowmobile Oil. Good Luck. Your two stroke fun is beginning. Prepare to wrench (seized motor, again!) as you learn.....:)

Oil is H.P. within reason.
No need to run expensive synthetic oils, just throwing money out the window! Stick with a good quality brand oil and set the pump to use 1 qt. in 100-120 miles.
I personally like Yamalube, it's semi-synthetic and can be bought for $10.00 per gal. at shows and meets. I dont own a Yamaha but have been using it for many many years with no problems.

How much power does it take to run the oil pump? What abotu AMsoil 100:1 pre-mix. In my dirt bike I run this at 80:1 and run it hard, with no problems? Would this work good?

Simply removing the pump will gain you nothing in performance. The 809 motor has a series of gears on the mag side. The main gear is the crank and it powers the oil pump on one side and the water pump on the other. It is a ton of work to remove the gears with the motor in the chassi. If you have an F-chassi you will have to pull the motor.
The pump cannot simply be removed by the 2 bolts, a gear is attached on the back side. Why bother for such a tiny if any power gain? Closing the hood vents for aerodynamics would probaly do more for you. There are many other ways for power increases other than the hassels of pre-mix.
This is how I see pre-mix: Your running a mixture of lets just say 50:1. The motor is getting 50:1 from idle to max rpm's, so in the lower R's it's choking on a heavy oil mixture, what good is that? Power loss IMO.

But as I sadi I use Amsoil 100:1 at 80:1 under conditions that are probably harder than most snowmobiling, and it runs good there, so The way it seems is 80:1 is more power than 50:1. As far as hassle, 1 quart is enough for all day, just pour some in the tank and fill it up. Don;t get me wrong I understand the ease of injection, but I am seriously beginnign to wonder if it is only ease.

426, the oil injection system is not just ease of use. It is offering superior oil control too. It is giving the engine the required amount of oil (not too much and just enough) throughout the rpm range. Don't forget it varies the amount of oil. Your 80:1 Amsoil mix would work great on a non-injected sled. But, why bother when the injection system is set up to be superior to running a straight mix? But in the end, if you want to do it, the 80:1 mix you are using would be fine. Good Luck.

426, if you really want to play with your gas to make max power, you really need to be looking at buying a gasoline power additive. This will safely allow you to modify your gasoline for more power. I can guarantee that you will get FAR more power than ANY thing you do with the oil. Call 248-628-5633 if you want to try some power additive. It is not cheap, but it will make your sled run better! Good Luck in your search for power.

Do you mean the oxygeniated fuel, I was thinking about that?