This is the first sled I've ever owned so I don't a lot about trouble shooting.
The sled is a 91 El Tigre 530. The compression on each cylinder is 100.
It seems to go through a lot of gas and injector oil.

Milage is around 4-5mpg and it needs the injector oil filled after every tank of gas.

Any suggestions??
Thanx

First of all 100 psi is pretty low so you might want to rebuild the engine and also check the color of your sparkplugs. THe perfect plug should look cardboard brown. A white plug is to lean and a black plug is to rich. I'm guessing it is carb so you have to talk to a dealer and they should be able to get you some jets and possibly show you how to change them

Thanx for the advice "moonshoes".

any other suggestions?

The compression is getting on the low side you should get over 10 mpg. You probably should change both pistons and rings, while you have the carbs off you should rebuild them too. For the whole job it's going to run you about $200 and take you an afternoon to do.

The jetting likely too rich for the conditions and I would check to make sure the chokes are not sticking open. Does it seem quite boggy and hard to get going and does it smoke a lot? I would clean the carbs and makes sure all the jets and passages are flowing and that the choke plungers close when the choke lever is off. You may also have a prblem with the float adjustment, or the inlet needle and seat which can cause it to flood and use extra fuel.

Snowmobile carbs have fixed size jets. You know that cold air is denser, contains more oxygen, therefore requires more fuel to achieve optimum air/fuel ratio. This is why you need to install larger jets when it gets colder, and smaller jets when it gets warmer. Most people run jets that are safe when it is real cold out and just put up with poor performace and fuel consumption when it warms up.

My thoughts.........
-compression seems low, might wanna check with a second gauge to confirm.
-oil pump is set far too rich...is it adjustable on your sled?
-jetting is far too rich or as suggested chokes are partially to blame
I would clean the carbs / set the oil pump back while monitorying consumption / confirm jetting including pilot and main jets (replace if they look anything but perfectly clean) / clean and repair your clutches as required / confirm belt deflection and clutch alignment is within specs / confirm correct belt and it's condition. Check / confirm track tension and all idler wheels.
Somewhere in all that stuff is your problem..............gonna take some checking though.

Rick

I would throw a set of rings on and go thru the carbs. I had one I bought new in 91 loved that sled, cornered like it was on rails, although the seat was stiff. I even hit a deer with that one. I traded it in 95 for a zr, and it had over 7,000 on it. I had custom pin stripes on the hood and it said "pure EXTacy" written on the hood, LOL. Kevin

You may also want to check the drive axle for proper lubrication and the idler wheel bearing condition throught the skidframe. Idler bearings need attention annually and will cause mega drag if ignored. Tracked vehicles are inefficient animals by design. Rusty dry bearing certainly don't help.

100 lbs is not a lot but I would concern myself first with the oil consumption as you are likely using 4-6 times more than you should be.
With that kind of oil ratio your fuel cannot fire properly.
With any luck, after correction your 100 lbs will suffice for the rest of this season.