LOOK AT WHAT THE GREMLIN GOT

Grats GMC...

My thoughts exactly

Passed up a real nice 1999 XC 700 for this one; passed it onto my boss who's going to pick it up tomorra. Too.... white. Too.... looks like a john deer. (slightly aerodynamic box)

GMC Gremlin

My XC has been a good sled, I call it the Kenmore due to it's a white sled also. 5.5k miles and it's running strong. Factory jetting was not great on them, if his is burbling at low speed I think I still have the specs for the right carb needles to make it run right. I don't ride it anymore, it's set up for the GF now and my REV is such a superior sled compared to it.

I have a 1978 Polaris TXL-340 but I burnt a piston in a couple years ago. anyone know how to fix these or tell me how?

Thanks, Bob :)

Best bet is probably to 'just do it'. Get in there, pull the engine out - it should be fairly simple. Pull the jugs and get yeself the piston, and while your there get a gasket kit. That far back, snow mobiles were pretty bare so there shouldn't be any junk in your way (not even a cooling system) to make it anything but easy. Ask the shop you buy from (go to a little 1-2 man shack/shop so the 'sales clerk' is the mechanic) and ask him what he would torq down to what.

GMC Gremlin

A guy calling himself "XCPilot" posted this a few years ago, I took his advice and installed the recommended parts with very good results. If I remember right the parts were a couple hundred bucks but the sled runs much better now. If you want to know more google rec.sport.snowmobiles for xcpilot. Bob

XCPilot wrote: The problem with your sled is that Polaris installed a bad combination of needles, pilots, and main jets. To get your sled to run I would suggest either 1370G or 1371G needles (clip in center), 38 pilots, 5.5 slides and smaller than stock jets-depending on altitude. The problem is that you are getting way to much fuel from the needles (1368G) and the 40 pilots on the low end. The 1370G needles are leaner in the 0 to 1/4 throttle range as are the 38 pilots. You will notice a huge improvement in how your sled runs on the low end after you make these changes. Your mileage will improve lots to if you do most of your riding at part throttle.

You got it Bob Terry (xc pilot) did a lot of testing to get to that point. I only put the 1370G needles in, clip in the #3 notch and went down 1 main jet size in the carbs. Carbs are stagger jetted BTW. I just adjusted the air screws and my sled ran like a top. I've got the factory manual and I think my sled had the proper slides OEM as he did his testing on a '98 and in '99 they went to the 5.5 slide. A set of 62 gram weights in the clutch and it's been running fine since winter '00 Running so fine it broke the drive axel in two the next winter. Was a weak batch out there. Other that it's still going strong and it's set up for the GF to ride. That sled would take my old fat 340lb butt (lost a bunch since then) down the lake and hit 110 mph on the speedo. For a '99 the needle and clutch weights cost will be under $75 to make it run great.