Calling All Overheaters - UPDATED

[billymx815]

Here I sit back home when I should be enjoying the trails till late tomorrow on my new RTX.
I've tried evrything to get this thing to stop overheating except adding MTX cooler etc. I mean I've added aftermarket vents, tried water wetter, flushed radiator, thinned out stock antifreeze to -30 freeze protection, replaced stock anitfreeze with Engine Ice high performance coolant -26 freeze protection, and added ice scratchers. Still within 20 minutes of riding on hard packed or 8" of fresh powder the temp light comes on
Last night we rode in 7 degree weather with 2-3" of loose snow on top of groomed trail. Hyfax got plenty of snow and so did heat exchanger yet temp light came on 20 minutes into ride so we ended early.
This morning it was 9 degrees and the trail was hard packed and same thing happened and it even boiled over. So we loaded it in the trailer and drove 5 hours home and dropped it off with dealer. I explained the issue and all the mods I've tried to correct it. Mods that someone shouldn't need to do on a $10k sled. I also explained that this $10k sled just cost me $280 in cabin fees because we had booked our cabin through Monday and now we had to leave today. The dealer told me maybe it's overheating because my Excell exhaust What? They said that out of the 17 Nytros they sold last year I'M THE ONLY ONE with an overheating issue.
So with that can anyone who had overheating issues out-of-the-box (stock) could you please reply...And those who started overheating when you put the Excell header on could you reply. I'm curious!

 

[yox185]

No way it's the exhaust. Did you check the thermostat?

 

[billymx815]

No way it's the exhaust. Did you check the thermostat?

In all my years of sledding I've never heard of such a thing either. I did not check the T-Stat but it could be the problem.

 

[Daranello]

its not the exhaust....its the dealer

 

[Grimm]

Definitely check that thermostat...pull it out and test it in hot water to see if it opens at 183 degrees or so.

It also could be air locked...after installing my MTX cooler and topping up the coolant, it overheated rather quickly. It wasn't until I jacked up the front end of the sled about 5 feet high did I managed to clear the air lock and add another liter of coolant to the system.

There is a bleeder valve at the back of the MTX cooler, maybe bleed the system that way would work also.

If the Dealer didn't check the thermostat, tell him to, and if he didn't, then find another Dealer, because he should have, instead of guessing it's the exhaust.

 

[loudelectronics]

Was it over heating before the exhaust? Mine never overheats even on glare ice trails.

Exhausts can lean out the motor enough to cause over heating if you do not have it mapped right. I do not know why people recommend selling slip ons with out a programmer. The machine has absolutely no way of compensating for the extra flow.

Do you have a block off plate or anything stopping snow from hitting the exhaust?

Like mentioned, check the thermostat to make sure it is working properly.

 

[4strknytro]

If you have overheated before you plugged up the small passages in the radiator. There is no way to clean it. You will have to replace it. Been there done that. Once you boil over or shut down on overheat you plugged up the whole system. Replace radiator and thermostat and flush system your problems will go away. Good luck with the fight under warranty.
Forgot to add that I'm the only one with a bent subframe but there on backorder and 100+ guys have bent them on here. Imagine the ones that don't frequent the forum. Dealers are programmed to pawn it off on something else-there trying to turn a profit in this crappy economy.

 

[loudelectronics]

If you have overheated before you plugged up the small passages in the radiator. There is no way to clean it. You will have to replace it. Been there done that. Once you boil over or shut down on overheat you plugged up the whole system. Replace radiator and thermostat and flush system your problems will go away. Good luck with the fight under warranty.

How would this plug the rad internally? Its not like the glycol gels or anything.

 

[2008 Nytro RTX]

Whoaaa,You have that much of a problem? My sled over heated once and that was very hard packed conditions and NO lose snow. Never did it again

 

[4strknytro]

I would have not believed it if I didn't see it but it looked like some sort of metal came out of solution. If you drove it for a bit like I did with no coolant for a while its plugged. Mine boiled over as well. It was ugly in there and the first flush did nothing.

 

[Ironmanstl]

Only overheating I had was sled's first trip out, never again after.
Sounds frustrating

hope you get it fixed

 

[bradthebest]

http://www.ty4stroke.com/viewtopic.php?t=80313

its 100$ but it might cure your problem .

or

http://www.ty4stroke.com/viewtopic.php?t=79925

i have never had an overheating problem on my mtx . i have no additional venting yet . i will be purchasing the top one though .

 

[**sj**]

thermostat dude....or a problem with the circulation..air pocket? I havent looked at this system...but with the two strokes when this kind of thing happened...we bled the cooling system ....viola!

 

[**sj**]

and...just to give you an idea...
it was 26 degrees today...
I spent a couple of hours on the lake today...minimal snow and about 30% coverage....0-110mph runs over and again...never overhaeated once..

 

[billymx815]

You all are giving me hope...So It sounds like you all agree that the Excell header is not the cause of the problem...I do have the PCIII with mapping from Ulmer so I don't believe she's lean. Don't like the sound of the plugged radiator though. Must have come that way from factory because she has never NOT overheated. That being said I think you guys are on to something with the T-Stat.