Harry Jacobson

Craig, The arctic conditions of interior Alaska require synthetic lube. I use Mobil 1 75W-140 in the front differential. The rear differential gets hydraulic oil specified for wet brake or clutch use. I could not find a synthetic for GL-4 specified by Suzuki and which contained the words “...wet brake or clutch.” I used a Carquest (Advance Auto) conventional oil which met those specifications. After plowing all winter and then hauling fill for my driveway, I will change the front and rear axle lubes before winter.

If you have a Suzuki with the rear brake inside the differential, you need a GL-4 lube that specifies use for wet clutch applications. I use Mobil 1 everywhere else on my King Quad but a conventional GL-4 wet clutch lube in the rear differential.

Snow removal in the interior of Alaska. Bought a used 2008 Suzuki King Quad 750 AXi with a plow. Though it was overkill. There have been times when full power in low range and locked differentials have been required to remove snow.

Maybe too late to help, but I read about running a ground wire from the black/white wire from the regulator (make the connection near the regulator) to the negative battery connection. Disconnect the battery first. Do not cut the black/white wire. Strip enough enough insulation to solder a ground wire to it and then wrap it in electrical tape. My 2008 would read about 13V at idle (it has a battery maintainer) right after disconnecting the charger and starting it. After splicing the above mentioned wire, the reading went to 14+ volts at idle.

I have a (new to me) 2008 750 AXi. I use 0W-40 Mobil 1 which is readily available at most stores of one of the world's largest retailer. Thw WIX filter is good, too, and is available from the world's largest online discount company (so is the oil). Availability is important to me in Alaska. Don't forget the front and rear differentials. The levels on mine were low with only 82 hours and 250 miles on the quad. I went to a NGK CR6EIA-9 (7967) iridium spark plug. Ten years of the previous (OEM) plug's installation made getting the old one out difficult. As you said, lots of power. I will be pushing a five foot plow with mine in the not-too-distant future.

My 2008 calls for gear lube in the front and GL-4/Wet brake fluid in the rear. Being new to the forum and Suzuki ATVs, I don't know if your 2005 uses enclosed rear brakes as my 2008 does. I have used Mobil 1 75W-140 synthetic for years in my trucks. I chnaged the front diff lube in my 2008 to that. For the rear, I went online and checked major auto parts stores until I found GL-4 and "wet clutch" specified. Although my trucks have been here a year, the ATV will experience its first interior Alaska winter with the new lubes (and 0W-40 Mobil ! in the engine). -30 degrees F and below will be the ultimate test.