05 Liberty 700 occasional bog problem

Have you ridden it in lower elevations than the snowies? what RPM range is the Bogg?

Does it have a DET sensor that might be getting set off or maybe the sled you have that motor in does not have enough cooling capacity-just a few ideas!

I would look towards The DET sensor, CDI or your stator. I doubt that the cooling is the issue. Don't run without the Thermostat. You can be riding hardpack and have it warm up then get fresh cold snow cooling the water too fast and then cooling your cylinders faster than your pistons causing them to seize. The risk is minimal but it is there. If you have any buddies with an 04 or 05 700 swap CDI's and see if that fixes it, or moves the problem to the other sled. Do the same with the DET sensor. Also make sure your running the correct plugs if you get a set of non-resistor plugs it can damage your coils or CDI.

Does your motor have any Mods? especially heads? if so it may be actual Deto and you need to do something with your fuel. Although it should happen way more in the flatland than in the elevation of the Snowies.

If you still can't find the problem I would lean towards your stator.

If you think you might have an airlock just let the motor run with the coolant bottle cap off until it starts circulating water. With the heat building up it should force the air out but watch it because the water level will start to rise and you will need to cap it again before it starts coming out. Also raise the front end higher than the back of the seat/coolant crossover hose (with the sled cool) and let it sit for a while then loosen the bleeder screw on the thermostat housing until all air if any stops coming out.

DET sensor is a round black disk bolted to the botom of the head between the cylinders directly below the thermostat housing w/ a small black 2 wire cable coming from it to your CDI. Your CDI should be from an 04 or 05 machine and say DET on the side of it. Does the machine have PERC Reverse? If not and or If you have an older CDI and no DET sensor on an 04 or 05 motor you will need to change the flywheel to get the timing curve correct. Get one from an 02 or 03.

Also try running a set of Champion RN57YCC plugs this is the OEM reccomendation and was specificly developed for Polaris libety twins. The NGK cross reference is not a direct replacement and could get heated causing detonation. I know a lot of guys hate Champ plugs (especially in fuji motors) but I personally have had little to no problems with them in domestic twins.

Do you have a temp light, and Prem light in your tach and do either of them flash when the bogging starts?

Your carbs should also have a TPS sensor (Throttle position sensor) on them (MAG side CARB) This controls the timing curve and must be correctly adjusted. If we get past all other problems I can send you the test box that I made and you can check it and send it back to me. This can cause al these issues and overheating even in good snowconditions.

If you have an airlock in your cooling system (very common on all edge sleds) it won't matter what your snow conditions are, it will overheat.

Where do you have your CDI mounted if you do not have an airbox? Don't mount it to any part of the motor, the vibration will destroy it.

Also since you don't have an airbox it is extremely important that your exhaust system is seald well, including the outlet in the bellypan. if you suck exhaust into your carbs it will bog like a mother.

Let me know if you find anything. once all other options are exhausted we can check into the TPS

The temp light and/or prem light will blink when deto is sensed by the Det sensor.

I would hook up a perc button to it (a simple push button in console will work fine) just because there is 2 different maps in the cdi that you can switch between on that motor. 1 for below and 1 for above 6000 ft. If you need an electrical diagram I can email you one (in fact I have an electronic copy of the service manual for 05 RMK's so it might come in handy). The electrical schematics also show where to check your stator and at what values.

PM me your info and I can mail you the TPS test box (just need a few bucks to cover the postage) or if you can read a schematic I can email you it and you can build your own. about $10 in parts from Radio Shack and about 20 minutes to put it together. Polaris and SLP get over $100 for the f-in thing. One other option is I could build you one and send it for $20 total (i'm bored).

Do you have a multi-meter that you can do some checking with? let me know what you need. I would hate to see you have to deal with this out west.

On another note, that's the same week I'll be in Island Park.