• 4 Stroke Husqvarna Motorcycles Made In Austria - About 2014 & Newer
     FE = 4st Enduro & FC = 4st Cross

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

FE/FC FE 350 still running hot

Russ Henry

Russ Henry

Husqvarna
AA Class
This had been the best bike out of the box that I have ever purchased except for this annoying over heating issue. In the slower trails it gets so hot on the right side that I cannot grip the bike with my leg. I sent the ecu to Halls to richen the mapping up and that helped quite a bit but is now back to heating up very fast. What do I do next ?
 
Aftermarket fans, bigger radiators, different coolant, a PCV. I say PCV because there are probably a ton of maps readily available for it and since that map didn't cure it. I really don't know what else to say. Do they have some crazy tubing with a thermostat like the xlites? Maybe FC hoses would work?
 
KTMs run hot. Does your bike have a fan? Maybe the best solution would be to use somthing to redirect the hot air away from your leg. Your not dealing with overheating the bike just don't like the heat all over you right?
 
Resign yourself to the fact that it is much like the orange KTMs which it has been joked about (many times) that they would overheat in the Arctic. Seriously, going to a KTM forum and finding threads on it might give you some tips about how to alleviate some of the problem.
 
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Reactions: Erb
Motosportz said:
KTMs run hot. Does your bike have a fan? Maybe the best solution would be to use somthing to redirect the hot air away from your leg. Your not dealing with overheating the bike just don't like the heat all over you right?
Click to expand...

Came with a fan that is constantly on. I will try the waterless coolant next
 
Russ Henry said:
Came with a fan that is constantly on. I will try the waterless coolant next
Click to expand...


The waterless coolant is awesome. I run it in my TE511 (The zipTy stuff). But its not going to make your bike run cooler just not boil over. What is really cool about it is it does not build pressure so will not try to get out. When i installed mine I forgot to tighten one hose clamp back up, I mean it was totally loose and hanging. Rode 60 miles and did not loose a drop!!! You can take your cap of when it is totally hot and no pressure. love it.
 
What about ditching the T-stat? And I know some KTM guys replace the fan switch with a replacement that kicks on at a lower temp.
 
I've done the richer (Aussie) fuel map adjusted my TPS to .61 and put the waterless coolant in. I put one of those temp stickers on top of my radiator and after doing a hard day of tight trail and monster hill climbs it never went above 209 deg and usually stayed below that. My buddy with a kx250 with waterless coolant and temp sticker in same location ran 209deg. So I can't complain. The coolant helped temps by 10-15degrees if I had to average it. My bike has 15hrs or so on it now. The first 5-6 hrs it ran hot and i could feel it on the right side.
 
Chums said:
I've done the richer (Aussie) fuel map adjusted my TPS to .61 and put the waterless coolant in. I put one of those temp stickers on top of my radiator and after doing a hard day of tight trail and monster hill climbs it never went above 209 deg and usually stayed below that. My buddy with a kx250 with waterless coolant and temp sticker in same location ran 209deg. So I can't complain. The coolant helped temps by 10-15degrees if I had to average it. My bike has 15hrs or so on it now. The first 5-6 hrs it ran hot and i could feel it on the right side.
Click to expand...

I had Halls do the same Aussie Map. Not sure if it included the TPS reset. I will try the coolant next
 
Could always trade it in for a cooler running Italian Husky. I bet you could even find somebody to trade you straight across.:D
 
Russ, Take alot of this as my set up opinions, however read the second part with open ears.

OEM stock louvers. Fan function. No thermostat assy. CV4 or equivalent hoses. ZipTy XF coolant.
remap of FI to better stochiometric levels (read more rich=cooler runing). Perhaps a more open exhaust (better flow not noisy, still enduro legal sound), to carry heat away. verify inspect clean fuel filter. Add ZipTy fuel filter (I just saw the one that Tinken mentions on ZipTy Racing pro Justin Morgans bike, its a sano item)

Now last (or first thing) thing be sure that the Injector is free and unclogged****************************************! . Note that Fueling (clogged injectors) issues have plagued KTM/Huskys in more than a few pro races this year.

Even partially clogged with a bad spray pattern will kill you with bad lean, o heat, bad combustion, weird issues.
You will think all is normal.......but its not. (ask me how I know.)
ZipTy sends them to a lab for post removal test eval and documentation, then the lab cleans/backflushes/chem treat them and redoes the eval and documents the results. My TXC310R (think FI system not model) was running well so I thought, but I had some stalling issues and then new owner had severe O heat issues as well as stalling issues.......
until ZipTy pulled the injector and showed me the test results, the spray pattern was like a squirt gun streaming all directions with little fuel atomization, and flow was reduced by something like 20% , the bike ran but was unknown to me (ignorance is bliss)... way down on fuel flow and thus lean and shooot was way down on power without me even knowing it.
This may also be why (it is why) when I rode the Sherco300 SEI that it felt waaaaay better than my TXC310R in the injection dept.
That said you could get a new injector install it and send out the original to ZipTy for a test and refresh, or they may swap it for a refreshed one, yea you will have 2 injectors.....so you have a reserve on the shelf as a back up. You also get the lab report report so you know if the injector was/is the issue. If not again you have a spare if so you have a perfect running bike with a new injector with a spare good one on the shelf.
 
Not discount what you said there but Russ bought his bike new and believe it has always been this way. He remapped it richer.

KTM run hot, this is no secret. Seems a rad and water pump upgrade would be good things on these bikes when rode in tight gnar. Reveille is reporting his (501) gets so hot it melts the rad shroud. You guys (cali) run in hotter weather than us but I know what Russ rides and a lot of it is very slow and technical. His fan runs all the time. Seems to me the cooling system simply cant keep up.

BTW I rode Russ' bike, I thought it ran flawlessly.
 
PS this what is done with our aircraft fuel nozzles as well. they always get sent in for spray pattern analysis, and returned to use/refurbished if they are satisfactory as far as all specs go, besides pattern and flow, they cant be deteriorated or corroded for example.
 
My buddies KTM 350 without a fan will begin steaming off within 5 minutes of riding Knar. He put a fan on and it runs constant but no more steaming issues. He uses engine ice like all the other KTM guys. My 501 only has 7 hours on it now but it will have 30 hours by next weekend so I'll circle back with some hard evidence on my specific 501 heat issues. I've done a reflash with trailtech switch and put XF+ in the rads. I hope it cools down after racking up some miles next week. Another side note, I checked and adjusted the valves last week and while the exhaust valves were spot on, my intakes were really tight(0.03 and 0.05) so I re shimmed those guys. The engine starts better and idles smoother after the valves were set. I changed the oil after the valve job with 0w40 and a PC Racing reusable filter. Hoping for some positive results from the maintenance as well.
P.S. The valve job on a 501 is really easy and pleasant compared to others I've done.
 
reveille said:
my intakes were really tight(0.03 and 0.05) so I re shimmed those guys.
Click to expand...

That seems odd. Most bikes these days seem really stable valve wise. Maybe the heat is causing this? My 511 has been run hard for 6000 and still within spec. Buddies YZ450F is the same way.
 
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