2025 was not our best year

 

You might remember my '78 Polaris Cobra, pictured here back in hapier times. Today the dang thing won't run because its got no spark on the MAG side. Generally I could get spark back if I cleaned the points some. Well this year that isn't working. So I figured it was finally time to throw some parts at the issue, so far I've replaced the external coils which didn't help at all. I bought, but have yet to install, new plug wires. Since this is a points machine the wires need to be copper core, not the new fangled graphite type. 

I think the real fix will be to replace the actual ignition power coil inside the mag. I got frustrated when snow was on the ground and just parked it up. I think I'm going to haul the machine to Maine and swap it with the old '70 Ski-Doo, that needs some welding on the frame and a gas tank clean but the repairs required are straight forward.

This is actually a more pressing concern. Adam and I took the ASV out to groom, this was back in mid February. We were just about as far south as we'd need to go when Adam commented that the machine felt down on power. Pretty soon we found that while the machine would go forward it wouldn't turn right.

We farted around with it on the side of the trail for a little bit but didn't find anything so we parked it up and walked out. It was nearly a mile out. Adam brings a backpack with nine thousand pounds of tools with him and as he was still recovering from surgery I got to lug that out.

The following weekend we went back with the Tucker and dragged it most of the way out to the road.

Turns out the machine can go straight ahead fine and turn left fine but can't turn right at all. This is good because the Tucker doesn't have enough power/traction to pull the whole combination up hill at all. So as we were hauling we'd start slowing down as Adam carefully adjusted the steering wheel to find the magic point where the machine would only go forward without trying to steer. The steering on this has always been sensitive and that didn't help. 

Overall I call this recovery a win, it worked way better than I'd expected.

Another weekend and we dragged the machine the rest of the way out and got it on the trailer. This was especially frightening because the trail looped around to the right so I ended up driving up on to the trailer and just hoping it was straight enough. Most of the trip onto the trailer I couldn't see anything but the plow and sky...

Now it sits in Ben's driveway where we've made a couple interesting discoveries. Mostly that it always turns left, forward or back. This means you can go anywhere you want but you need to do it as a series of left turns. Interestingly this tells me that both drive motors work correctly, to turn left going forward the right drive motor pushes forward. To turn left going backward the left drive motor pushes backward.

The left drive motor won't push forward and the right drive motor won't push backward.

Digging into it more we exposed the pump section of the system which, the manual says, has oil pickups for the pumps that feed the drive motors. The pickups are supposedly covered with screens so right now our best bet is to clean those screens. Unfortunately the screens are underneath 35 gallons of hydraulic oil...

A new whip

 Well, a new-to-me groomer. The former operator left the club so we needed to shuffle around a little and I drew the short straw. Fortunately we had been training another operator and it made more sense to put him in the ASV which parks with the Pisten Bully. That way if he had trouble Ben would be close by to help.

Anyway this beast is a 1989 Tucker Sno-Cat 2000.

It's got a Cummins 6BT like a Dodge pickup and as you can see, 4 tracks.

I've heard it called "Farm equipment with aspirations" and that's not wrong. It's an interesting beast but not without issues. The drivetrain is really simple, the 6BT mates to a 3 speed automatic transmission and single speed transfer case. The axles are, I think, Spicer truck rear axles that pivot at the centerline of the axle. So the tracks are firmly attached to the axle and the whole axle moves. Both axles pivot so its effectively "four wheel (track) steer". This one in particular has something wrong with it and steers really hard at the limits, it also doesn't seem to steer as far as our other machine. I don't know what the issue is but its annoying.

I had terrible trouble with it icing up early on. The output of the fuel tank is right in the very bottom of the tank and I think it had some water that settled there. That water froze and in cold temps the machine would just barely run. The first time I took it out it took half an hour or more to get it warmed up enough to go out. Fortunately that run seems to have cleared the blockage. Before the second run I changed the water separator and fuel filter and it ran fine.

Some chucklehead took a side by side out in wet snow, this was real fun to fix

Driving is an odd experience, the automatic transmission has its work cut out for it making shifts with all the drag of the machine. A few times I've been fooled into thinking that we were losing power when in reality I just needed the machine to downshift. The 4 tracks are *relatively* nimble as long as you're going forward, it'll slalom fairly well. The 4 track system is nowhere near as nimble as either of the 2 track machines we have though and it's REALLY slow in reverse. I plowed snow with it one day and it took forever. I'd have been better off getting the ASV started, waiting while it warmed up and then plowing...

The most positive thing is that it's fast. It'll pull a pretty good load of snow at 10mph where the ASV can only do serious work in slow gear, 5-6mph. This is important for the run the Tucker is assigned which goes from Winchendon, MA to Barre, MA. The first trip was down and back and took something like 9 hours. That one we had to open a bunch of gates and of course deal with the machine being frozen. The second run I only went one way and made it in about 4.

Angie went on the second run with me and said she liked the Tucker more than the ASV. I'll put that down to it having been years since she was in the ASV...

End of the season

 Well, at least we had some season this year.

The other day Ben and I went down to put the machines to sleep for the summer.

We take the drags off so the machines take up less space and leave parking for dog walkers and other woodland adventure types.

It had been really cold the night before so I hoped that the ground would be pretty hard but as you can see on the ground it really wasn't. The Pisten Bully with its steel cleats really chews up the sod. Since its a shady area the grass isn't really all that thick. I'll go back with a rake in a day or two and clean it up a little more but compared to last year this is great. Last year I couldn't get the ASV drag into its spot for the life of me, I ended up chewing great ruts in the ground. Of course I took the drag off in May...

Riding 2021, Jag repair

 I think it's been 3 years since we went for a real trail ride. The registration on the '98 Jag ran out last year anyway...

So a couple weeks ago when the snow was still good Angie and I got the two Jags out for a rip.

We had groomed the night before so the trails were really good. The snow wasn't great but what snow was was flat. We did about 20 miles just around the park, I had updated the registrations but as it was kind of late in the season I didn't get trail passes. As a board member I'm allowed a free trail pass but I've only taken one once. That was the year we rebuilt the track on the Pisten Bully and Ben wouldn't take my money. The club still has to pay for the pass and we're not exactly flush with cash.

Angie rode the old '91 the whole time, it was smooth enough that the lack of suspension wasn't a problem. I think I'll look for a Z or ZL machine with a blown engine and swap the suspension into it. The machine is a little lighter than the '98 and the dual carbs make a little more power.

The '98 ran like crap, it would spit and pop and fart and just had a terrible time. I had an inkling that the problem was the throttle safety switch. There are two little bushings where the pin that holds the throttle lever on are so I replaced them. I really miss having a shop just down the street to get parts like that.

Arctic Cat calls these "seals" and you can see that they're kind of chewed up. The new ones didn't make any difference though so I pulled the connection. Arctic Cat is interesting, they used 2 different electrical systems. Some are "normally open" which means there is an open circuit and to shut the sled off you close the circuit and ground the coil. Then a bunch of them are "normally closed" so the circuit powers the coil and you open the circuit to shut the machine off.

My '91 Jag is "normally closed", when the throttle switch failed on that and the previous owner wanted to jump around that switch he had to add a little jumper. The '98 is "normally open" and so I could just unplug the kill switch plug which includes the throttle switch. 

With the kill switch unplugged the sled ran perfectly. For the first time since I've owned it I could bomb around the yard. Used to be the sled ran great on the trail but poorly in the yard, now its fine all the time.

I had hoped I could just pull the throttle assembly apart and just jumper out the throttle switch but in doing I managed to break the kill switch. The sled still runs but I don't like not having a kill switch. Fortunately replacements are available. Unfortunately they cost about 15% of what the sled is worth...

The snow is gone now anyway, so I don't need to worry about it right away. I'll probably fix it, I like riding the sled. I'd thought about getting a brand new machine to replace both Jag's but they did so well...

Dead Sled Wrenching again!

 Ahh dear readers you must think I've abandoned you. Well maybe I had but here's some dead sled wrenching content.

The first big snow of 2021 is here so Saturday and Sunday I took some time to get things going.

I started with the two Arctic Cat Jags. Last year I had the '98 going although we never had any snow so I figured I'd start with the '91 this year. It was wicked cold when I dropped them off the trailer and I was disappointed when the '91 wouldn't crank at all. I stuck an electric heater under the hood and shifted my attention to the '98. It was simple enough to pull the plugs, squirt some gas down the plug holes and I was shocked when it fired up and ran on the very first pull. I did have to reprime before it would stay running on fuel from the tank and then the track really didn't want to spin but we got 'er going with relatively little fuss.

With that little accomplishment I moved to the '91, the recoil still wouldn't make the engine turn so I grabbed the clutch and broke it free with little trouble. I've seen this before where a little condensation gets into the jug and since it was so cold that ice held it a little. With the engine free I yanked the rope and, it stayed out... Blarg, a little Kroil fixed that and I shot a little more into the engine to lube it up. A little gas down the plug holes and this one also fired right up. I gotta say I love how the wedge Jag's go, they're lighter and snappier than the newer machines. I suspect the dual carbs on this one help too.

Flushed with success I moved on to the '79 Polaris Cobra. I haven't run this machine for several years, in fact I see my last post was working on that machine and it was very nearly 2 years ago. At that time it had no spark and I failed to fix that.

Well here is one of the culprits, this is the rear set of points. I don't remember which cylinder they're for, it doesn't really matter, they were both dirty. It was hard to get a picture but you can see how they're kind of greasy, what you can't see is that they were also kind of green. I tried my usual trick, Deoxit and a business card. While I could get the business card to come out dirty it didn't seem like things were really improving so I resorted to a file. Harbor Freight sells a nifty little file set that isn't marketed toward filing points but they're the right size and shape. I scraped on 'em a little bit, then sprayed off the residue with cheap contact cleaner, then repeated with Deoxit. Then got frustrated and quit for the day. Actually I shouldn't have been frustrated, we went from absolutely no spark to a little blip. It might not seem like much but thats improvement.

So yesterday I went back out, filed more, cleaned more, etc. The frustrating thing is that the recoil and inner cup have to come off to get to the points so you have to put it all back together to test it. Anyway after two more cycles I put it back together and YOWSA we've got spark!

At some point Saturday I did have the forethought to take the airbox off and have a look inside.

Mr. and Mrs Mouse got evicted...

The nice thing about having the airbox off was to make it easy to shoot gas into the carbs. And thats where we got stuck again, it would pop on premix but wouldn't stay running. So I pulled each carb out of its boot, flipped it over, popped off the bowl and cleaned it and the jets. I also make sure the needles were moving. Surprisingly nothing looked too bad, a little schmoo in the bowl maybe but nothing to write home about. 

Put it all back together and it STILL wouldn't run, I mean it'd run for a second on premix but wouldn't stay running. I figured it needed more gas so I got a couple fresh gallons mixed up and, well blarg...

Finally in desperation I took the torch and heated each plug until it glowed red, stabbed 'em in, shot in gas one more time and sonofagun she took right off. This machine has always idled high and it still does. Maybe when we get some snow and I can run it some more I'll try to adjust it, I do have a carb synchronizer I've never used...

So everybody is running and moving, I really like riding the Polaris, its light and geared low so its quick off the line although it runs out of snort pretty quick. The brake isn't working but thats just the fluid leaking out after sitting a couple years. I'll top it up and it should come right back.

If you've always wanted a Polaris Cobra (or one of the Jags) let me know, you could have this one. Its been a fun sled but I'm ready to play with something else for awhile. I'm open to trades even...

Back to the Polaris

I got an email from longtime reader Vanessa a couple weeks ago. Her Panther 303W had no spark so I sent her my procedure for cleaning points.
In a nutshell: Get a can of Caig De-oxit, open the points, squirt in some de-oxit, let it sit for a minute, pull strips of paper through until they come out clean, repeat.
Vanessa replied that she got spark bag and now has a running machine, sweet, score one for the good guys!
So yesterday I decided I'd get a snowmobile running, we really don't have any snow and theres none in the forecast (50s tomorrow...) but what the heck, maybe the snow gods need a sacrifice.

This is my '79 Polaris Cobra 340. When I first bought it there was no spark, I cleaned the points and got it running, then a couple years later put in new crank seals. This one has always been a little finicky to start if its been sitting awhile and since I didn't run it at all last year I knew it was going to be a challenge.

Right off the bat no spark on the mag side so as you can see in the picture I proceeded to clean the points which resulted in? No spark at all...

Rats.

This sled has always been sensitive to plugs and it uses B8ES which I don't seem to have in stock. I'm going to order a box of them this time...

Broken Groomer Part 2

It was the beginning of April, the snow cover was decent but the days were warm. We decided it was too warm to groom at night, the snow wouldn't move good so we made a plan to groom first thing in the morning, 6am. This would be our last day out, club picnic and the trails would close the next day so get the trails nice.

Everything south of Lake Dennison was already closed so just a quick run to groom the park. I only have one regular loop inside the park, Ben does all the rest but we figured after I'd done my normal loop I could pick up some of the other stuff. Mike was riding right seat, his second trip out with me, I had plans to get him some stick time.

Just as we turned onto the main drag I knew we had problems, little tendrils of steam. I'd never groomed when it was warm though and just passed it off for that but about the time I got the drag full of snow and grooming good the little tendrils became a big cloud, uh oh...

Looking under the machine I could see a geyser of coolant, I couldn't tell where from but it had to be a heater hose to the cab. We limped the machine to the beach where the picnic was to be held.

I didn't get any pictures but the cab tips up so the driver's door is about 4' up. With that tipped I could see a ragged hole in one of the heater hoses. Apparently this had happened to Chris the year before but on the other hose, he'd fixed that with a union connector. This time I used the same union to connect the two heater hoses together, topped up the coolant and drove it back to the yard...

A couple months later we moved it to my house. I wish I had pictures of it, the machine is heavy, like 9,000# heavy, too much to pull with a normal pickup. Glenn came with a 3 axle dump truck and trailer. The ASV looked puny on his big trailer.

 With the right seat out I could get to the heater, fortunately there are two unions right in the middle of the picture which were a lot easier to access than the heater core itself. I sent this picture to the other groomer operators with "That escalated quickly" as the caption.


I got a funny look from the parts guy when I asked for 18 FEET of 3/4" heater hose, apparently thats how much they normally sell each month. It took 17.5 feet in total...

These are the old hoses. Theres a hydraulic leak at the controls which drips down through the access hole below the cab and pools on these hoses which then deteriorate from the oil. I intend to fix the hydraulic leak, I think its just o-rings but I want to do it with help from somebody who really knows what they're doing, for now its not too much of a problem. I put a catch pan with a pig pad in it under the leak, hopefully it'll will prevent the new hoses from deteriorating.