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They run great. We dump it under the tunnel just ahead of the polaris tank. Just like the one ton. We use the polaris fuel pump for EFI, but use the apex regulator.

Finally getting my EFI RXPro (My old trusty RX-1 motor with 13k miles in a 2016 Polaris Pro 155 chassis) dialed in. I use the stock ignition so I was able to get a tach trigger for the controller for "fuel only" from a coil signal. Parts list includes Apex throttle body, Microsquirt controller...

Still 12 one tons running at Lake Kachess. We've lost two motors in the last year due to low oil. They are all 03's and we roll them out of holes a lot. They burn a little oil, and leak quite a bit when upside down. Its a tough lesson for young riders. They figure cause it isn't a two stoke they...

A lot of riding and not much videoing. Headed to McCall in a week for an annual trip. Snow has been piling up this year, and my son broke loose a good sized avy a few weeks back riding one of our group's turboed tons. Fortunately he was able to outrun it. The fracture line is near the top of...

I pulled my skid on my 03 rx1 with 11k miles and notice my "y" in my two y-pipess had gotten so hot they melted and collapsed. We run under tunnel exhaust, and I just adjusted my valves. My sled has been running real strong. I also recently installed an electric fuel pump. We run ten other sleds...

The cam definitely sticks in the journals. I'll hit some more with emery cloth. This is the second time I've had my valve clearance on cylinder four close up to zero so that the intake valves won't seal when the engine is cold. Once warmed up I have compression. I can't imagine what make the...

The pistons and head look OK so I ordered new valves. My concern is the intake camshaft does not turn freely. I cleaned up the journals with 600 grit Emory cloth and the shaft still sticks in the journals. The shaft doesn't seem to sit all the way down in the journals, or the caps. You have to...

megavideo was taken down so i uploaded them to my dropbox account. Man, we are getting snow! as soon as it lets up we should get some good filming. http://db.tt/Dqi6ULBX http://db.tt/59p0OYHo

I re-shimmed my intake valves on my 03 rx1 (11000 miles). Slapped it back together, spun it, checked compression, fired it up, and "clunk". Timing chain jumped the intake cam sprocket and bent no. 1 cylinder intake valves. I haven't removed the head but I can see the caps are not up. First...

Well it starts the sled, but it doesn't turn it over like my $30 Chinese ytz10s. Not sure why because the specs give it more CCA, and more capacity. Think I'll double check my connections. Oh. And the directions said don't use a tender or trickle charger on it. Said it won't loose charge...

We finished ours last nite. Took two nights total. Lots of bolts and rivets but nothing very difficult. We forgot to swap the oil tank bracket that attaçhes to the bulkhead until almost together and it was a bear to access the bolts, but otherwise it was pretty relaxing job. The kind you can do...

We are doing one right now; both sides. We have all the rivets out and its pretty trapped. We are to the point of removing the tank and releasing the top frame. That seems like it will allow the bulkhead to slide out and in. The engine just drops a tad when u unbolt the front. Two other guys in...

Just ordered one.5 1/2 lbs ighter than the ytz10s (wich only weighs 7lbs) which we run.

No. 3 Ton is back. One of our riders came across our third Kachess mod sled on Craigslist and snatched it up. It had been sitting in a garage for five years, it wrapped up the 06 season and never hit the snow again. We have a series 4 159 to install and a few updates and she'll be ready to...

I replaced the timing chain and timing is now dead on. Engine runs slightly better, but still off on power, does not wind up fast, and has the strange growl for an exhaust note. I rechecked compression, and all plugs look equal and are a nice tan. Running out of ideas I decided to check the...

The gear on the timing chain was not slotted but the marks on the cams don't line up very well on their arrows while timing it. If the exhaust is on the intake is a little off. On my other sled they match right up, but on this sled if one cam lines up the other is off a little. I also noticed...

I'm going to go back and check valve timing again. I measured distance from top of pistons to top of spark plug seat on the equal cylinders and they are right on so I'm thinking the rods are true. I've timed the valves on my other sleds and have had no problem. On his sled the exhaust cam is...

You can feel it in the handlebars. Not real bad, and i figured maybe it was motor mounts, but all our other tons are much smoother. I've swapped out the clutch. Bearings are good and it has 3in drivers that rumble a little, but some of our other tons with 2.5 inch drivers rumble a little. I...

I purchased a used bender rear mount RX-1,(with NOS, no head shim) a few years back and have never been able to get it run right. It blew oil out the exhaust, vibrated, and didn't develop power like it should. I finally stripped off the turbo/nos and realized the stock motor blew oil and ran...

I have now replaced the rings, have no oil consumption and have good compression on all cylinders, but the thing still runs exactly like it used to, like a dog. Sluggish, Slow to spool up and slow to come back to idle. Engine still only has maybe 80% power. Engine vibrates and has an odd exhaust...